CN103276394A - Laser remelting one-step reinforcing processing method and device thereof for plasma sprayed thermal barrier coating with double-layer structure - Google Patents

Abstract

Translated fromChinese

本发明公开了一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法及其装置，在经过净化和活化处理后的基体表面上采用等离子喷涂工艺依次喷涂双层结构热障涂层；采用感应加热辅助激光重熔复合工艺对双层结构热障涂层进行重熔。采用感应加热辅助激光重熔复合工艺，能够弥补单纯激光重熔能量不足的缺点，从而使一次激光重熔可以同时熔化双层结构热障涂层中陶瓷层和粘结层，使陶瓷层与粘结层界面、粘结层与基体界面同时达到冶金结合的一步强化目的；具有工艺简单、稳定性好、重熔涂层质量高等优点，因此有望应用于航空涡轮发动机叶片等关键热端零部件表面。

The invention discloses a plasma spraying double-layer structure thermal barrier coating laser remelting one-step strengthening processing method and a device thereof, in which a double-layer structure thermal barrier coating is sequentially sprayed on the surface of a substrate after purification and activation treatment by a plasma spraying process ; Induction heating assisted laser remelting composite process is used to remelt the double-layer structure thermal barrier coating. The induction heating-assisted laser remelting composite process can make up for the shortcoming of insufficient laser remelting energy, so that one laser remelting can melt the ceramic layer and the bonding layer in the double-layer structure thermal barrier coating at the same time, so that the ceramic layer and the bonding layer can be melted together. The interface between the junction layer and the interface between the adhesive layer and the substrate can achieve the purpose of one-step strengthening of metallurgical bonding; it has the advantages of simple process, good stability, and high-quality remelted coating, so it is expected to be applied to the surface of key hot-end parts such as aero turbine engine blades .

Description

Translated fromChinese

一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法及其装置A plasma sprayed double-layer structure thermal barrier coating laser remelting one-step strengthening processing method and device

技术领域technical field

本发明涉及一种对热障涂层进行激光重熔强化的方法和装置，尤其涉及的是一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法及其装置。The invention relates to a method and device for laser remelting strengthening of a thermal barrier coating, in particular to a plasma sprayed double-layer structure thermal barrier coating laser remelting one-step strengthening processing method and a device thereof.

背景技术Background technique

为了降低未来航天航空发动机的燃料消耗，提高推力/质量比和使用寿命，许多密度低、室温韧性好、高温强度高的先进材料将被大量使用，同时各种功能涂层将得到广泛应用，其中热障涂层对提高发动机工作温度起着非常重要的作用。In order to reduce the fuel consumption of future aerospace engines and improve the thrust/mass ratio and service life, many advanced materials with low density, good room temperature toughness and high temperature strength will be used in large quantities, and various functional coatings will be widely used, among which Thermal barrier coatings play a very important role in increasing the engine operating temperature.

热障涂层主要有三种结构：双层结构、多层结构和梯度结构。其中双层结构的面层是表面陶瓷层，中间层为金属粘结层。多层结构是在双层结构的基础上多加了几层封阻层，一般有五层，但这种结构对抗热震性能改善不大，而且工艺复杂，因而逐渐被梯度涂层所取代。梯度结构涂层是在陶瓷层和基体金属之间采用成分、结构连续变化的一种结构，它可以减小陶瓷层与粘结层因线膨胀系数不同而引起的内应力，从而提高涂层的结合强度和抗热震性能。由于制备工艺简单，双层结构热障涂层成为热障涂层主要采用的结构形式。There are three main structures of thermal barrier coatings: double-layer structure, multi-layer structure and gradient structure. The surface layer of the double-layer structure is a surface ceramic layer, and the middle layer is a metal bonding layer. The multi-layer structure is based on the double-layer structure with several additional barrier layers, generally five layers, but this structure has little improvement in thermal shock resistance, and the process is complicated, so it is gradually replaced by gradient coating. Gradient structure coating is a structure in which the composition and structure of the ceramic layer and the base metal are continuously changed. It can reduce the internal stress caused by the difference in linear expansion coefficient between the ceramic layer and the bonding layer, thereby improving the coating. Combines strength and thermal shock resistance. Due to the simple preparation process, the double-layer thermal barrier coating has become the main structural form of the thermal barrier coating.

目前，制备热障涂层的技术主要有等离子喷涂和电子束物理气相沉积等。等离子喷涂具有成本低，生产效率高，厚度可调，成分易控制等优点，但涂层呈典型的层状结构，气孔多，抗热冲击差；涂层与基体为机械结合，耐应变差；而电子束物理气相沉积技术制备的垂直于基体表面的柱状晶结构，空隙少，涂层与基体为冶金结合，抗热冲击和剥落能力强，但电子束物理气相沉积技术的沉积速率较低，设备造价昂贵，受元素蒸汽压的影响涂层的成分控制较困难，基体零件需要加热且试样尺寸不能太大。因此这两种制备技术都有明显的不足，从而限制了其应用范围。At present, the techniques for preparing thermal barrier coatings mainly include plasma spraying and electron beam physical vapor deposition. Plasma spraying has the advantages of low cost, high production efficiency, adjustable thickness, and easy control of composition, but the coating has a typical layered structure, many pores, and poor thermal shock resistance; the coating is mechanically bonded to the substrate, and the strain resistance is poor; The electron beam physical vapor deposition technology has a columnar crystal structure perpendicular to the surface of the substrate, with few gaps, the coating and the substrate are metallurgically bonded, and has strong thermal shock and peeling resistance, but the deposition rate of the electron beam physical vapor deposition technology is low. The equipment is expensive, and it is difficult to control the composition of the coating due to the influence of the vapor pressure of the elements. The base parts need to be heated and the sample size should not be too large. Therefore, these two preparation techniques have obvious deficiencies, which limit their application range.

激光重熔是改善等离子喷涂热障涂层性能的有效方法。在激光重熔的过程中，高能量密度热源快速移动，材料快速凝固产生均匀、致密的显微结构，且表面光洁度高，从而提高涂层质量，延长涂层寿命。但是由于热障涂层表面陶瓷材料的耐热冲击性差、断裂韧性值低，因此在激光重熔过程中的急剧加热、冷却条件下易产生裂纹，再加上表面陶瓷材料的熔点大大高于粘结层和金属基体，且它们之间的热膨胀系数、弹性模量和导热系数等物理参数相差很大，在激光辐照后所形成的熔池区域的温度梯度很大，由此产生的热应力容易导致涂层产生裂纹或剥落，一定程度上限制了涂层性能的进一步发挥。Laser remelting is an effective method to improve the properties of plasma sprayed thermal barrier coatings. In the process of laser remelting, the high-energy-density heat source moves quickly, and the material solidifies rapidly to produce a uniform and dense microstructure with high surface finish, thereby improving the coating quality and prolonging the coating life. However, due to the poor thermal shock resistance and low fracture toughness value of the ceramic material on the surface of the thermal barrier coating, cracks are easy to occur under the conditions of rapid heating and cooling during the laser remelting process, and the melting point of the surface ceramic material is much higher than that of the viscous material. The junction layer and the metal substrate, and the physical parameters such as thermal expansion coefficient, elastic modulus and thermal conductivity differ greatly between them. The temperature gradient of the molten pool area formed after laser irradiation is very large, and the resulting thermal stress It is easy to cause cracks or peeling of the coating, which limits the further performance of the coating to a certain extent.

目前，激光重熔等离子喷涂双层结构热障涂层通常有两种方式：一种是对等离子喷涂预置的双层结构热障涂层进行整体一次激光重熔强化，另一种方法是首先等离子喷涂金属粘结层，然后对其进行激光重熔强化，经过表面处理后再喷涂表面陶瓷层，最后对陶瓷层进行重熔强化的分步强化工艺。At present, there are usually two methods for laser remelting plasma sprayed double-layer structure thermal barrier coatings: one is to carry out overall laser remelting strengthening on the plasma sprayed double-layer structure thermal barrier coating, and the other is to first Plasma spraying the metal bonding layer, then laser remelting and strengthening, spraying the surface ceramic layer after surface treatment, and finally remelting and strengthening the ceramic layer in a step-by-step strengthening process.

一次重熔法工艺简单，相关报道也较多，最初主要侧重于激光重熔处理对涂层组织、性能的影响以及工艺参数优化等研究，如Tsai（Tsai P C,Lee J H,Hsu C S.Hot corrosionbehavior of laser-glazed plasma-sprayed yttria-stabilized zirconia thermal barriercoatings in the presence of V₂O₅[J].Surface&Coatings Technology,2007,201:5134-5147.）和Lee（Lee J H,Tsai P C,Chang C L.Microstructure and thermal cyclicperformance of laser-glazed plasma-sprayed ceria–yttria-stabilized zirconiathermal barrier coatings[J].Surface&Coatings Technology,2008,202:5607-5612.）（Tsai P C,Lee J H,Hsu C S.激光重熔等离子喷涂Y₂O₃稳定ZrO₂热障涂层V₂O₅熔盐热腐蚀行为[J].表面涂层技术,2007,201:5134-5147.和Lee J H,Tsai P C,Chang C L.激光重熔等离子喷涂CeO₂-Y₂O₃稳定ZrO₂热障涂层组织及热循环性能[J].表面涂层技术,2008,202:5607-5612.）等研究了激光重熔对等离子喷涂热障涂层组织、热腐蚀性能及热震性能的影响，而发明人研究了激光重熔对等离子喷涂MCrAlY/ZrO₂-7%Y₂O₃双层结构热障涂层组织、高温氧化性能及冲蚀性能的影响（王东生,田宗军,沈理达,等.TiAl合金表面激光重熔热障涂层组织及抗高温氧化性能[J].功能材料,2009,40(4):578-581.王东生,田宗军,王泾文,等.激光重熔对等离子喷涂热障涂层冲蚀行为影响[J].焊接学报,2011,32(2):5-8.），结果表明：等离子喷涂热障陶瓷涂层呈典型的层状堆积特征，有一定的孔隙且分布有微裂纹；经过激光重熔处理后，陶瓷涂层片层状组织得以消失，致密性提高，获得了基本没有裂纹等缺陷的重熔层；整个重熔层包括界面没有明显特征的平面晶和上部沿热流方向生长的柱状晶组织；等离子喷涂热障涂层具有较好的抗高温氧化和冲蚀性能，经过激光重熔后可进一步提高其抗高温氧化及冲蚀能力；等离子喷涂层的冲蚀磨损以片层状脱落为主，同时有一定程度的脆性陶瓷颗粒破碎，而激光重熔试样以近表面的裂纹萌生和扩展，最终导致重熔层晶粒破碎、剥离为主。但是由于受到激光功率、能量密度、激光作用区温度场分布、陶瓷导热系数和涂层厚度等因素的综合影响，激光一次重熔往往只能使陶瓷表面得到重熔强化，而陶瓷面层与金属粘结层、粘结层与基体界面及粘结层本身不能获得有效的强化，从而成为整个热障涂层工作过程中破坏的薄弱环节。The one-time remelting process is simple, and there are many related reports. Initially, it mainly focused on the research on the influence of laser remelting treatment on the structure and performance of the coating and the optimization of process parameters, such as Tsai (Tsai P C, Lee J H, Hsu C S.Hot Corrosion behavior of laser-glazed plasma-sprayed yttria-stabilized zirconia thermal barrier coatings in the presence of V₂ O₅ [J].Surface&Coatings Technology,2007,201:5134-5147.) and Lee (Lee J H, Tsai P C, Chang C L .Microstructure and thermal cyclic performance of laser-glazed plasma-sprayed ceria–yttria-stabilized zirconia thermal barrier coatings[J].Surface&Coatings Technology,2008,202:5607-5612.) (Tsai P C, Lee J H, Hsu C S. Laser remelting Hot corrosion behavior of plasma sprayed Y₂ O₃ stabilized ZrO₂ thermal barrier coating V₂ O₅ molten salt[J].Surface Coating Technology,2007,201:5134-5147. and Lee J H,Tsai P C,Chang C L. Microstructure and thermal cycle performance of ZrO₂ thermal barrier coating stabilized by laser remelting plasma spraying CeO₂ -Y₂ O₃ [J]. Surface Coating Technology, 2008,202:5607-5612.) et al. The influence of sprayed thermal barrier coating structure, thermal corrosion performance and thermal shock performance, and_the inventors studied the effect of_laser remelting on the structure, high temperature_oxidation Influence of performance and erosion performance (Wang Dongsheng, Tian Zongjun, Shen Lida, et al. Microstructure and high temperature oxidation resistance of laser remelted thermal barrier coating on TiAl alloy surface[J]. Functional Materials, 2009,40(4):578-581. Wang Dongsheng, Tian Zongjun, Wang Jingwen, et al. Effect of laser remelting on the erosion behavior of plasma sprayed thermal barrier coatings [J]. Journal of Welding, 2011,32(2):5-8.), the results show that: plasma sprayed thermal The barrier ceramic coating is characterized by typical layered accumulation, with certain pores and distribution of micro-cracks; after laser remelting, the lamellar structure of the ceramic coating disappears, the compactness is improved, and almost no defects such as cracks are obtained. The remelted layer; the whole The first remelted layer includes planar grains with no obvious interface features and columnar grains growing along the direction of heat flow on the upper part; plasma sprayed thermal barrier coatings have good resistance to high temperature oxidation and erosion, and can be further improved after laser remelting. Resistance to high temperature oxidation and erosion; the erosion wear of the plasma sprayed coating is mainly lamellar shedding, and at the same time, there is a certain degree of brittle ceramic particles broken, while the laser remelted sample is crack initiation and expansion near the surface, which eventually leads to heavy The grains of the molten layer are mainly broken and peeled off. However, due to the comprehensive influence of factors such as laser power, energy density, temperature field distribution in the laser action area, ceramic thermal conductivity, and coating thickness, laser remelting often can only remelt and strengthen the ceramic surface, while the ceramic surface layer and metal The adhesive layer, the interface between the adhesive layer and the substrate, and the adhesive layer itself cannot be effectively strengthened, thus becoming the weak link of destruction in the entire thermal barrier coating process.

相对于激光一次重熔工艺，分步强化方法要依次重熔粘结层和陶瓷层，从而使工艺过于复杂，而且其制备的可重复性和涂层质量的稳定性不高，再加上二次重熔的应力叠加效应使涂层更易开裂和剥落，因而虽然其强化效果比一次激光重熔好，但该技术并没有得到广泛的应用。如高阳等（高阳,解仑,佟百运,等.激光熔敷氧化锆热障涂层微观结构研究[J].航空材料学报,2003,23(3):1-4.高阳,潘峰,梁勇,等.高温合金表面激光熔敷热障涂层组织结构与氧化性能[J].航空材料学报,2003,21(1):4-7.）研究了激光二次重熔对热障涂层组织结构与氧化性能的影响。在试验中其对基体喷砂处理后首先等离子喷涂NiCoCrAlY合金层，然后采用5KW连续CO₂激光器进行重熔；对重熔合金层表面喷砂处理后，再将ZrO₂陶瓷粉等离子喷涂于表面，然后喷漆黑化，再次进行激光重熔。结果表明：激光快速熔化和凝固获得定向外延生长、紧密堆积的柱状晶氧化锆陶瓷层。NiCoCrAlY结合层与柱状晶之间存在氧化铝层，保证了柱状晶与NiCoCrAlY层的联结，另外氧化锆层与NiCoCrAlY结合层、结合层与基体间均为冶金结合。高温氧化性能测试得出激光重熔试样氧化动力学近似地遵守抛物线速率方程。在1200℃，空气下激光重熔热障涂层抗氧化性明显高于等离子喷涂热障涂层。Compared with the laser remelting process, the step-by-step strengthening method needs to remelt the bonding layer and the ceramic layer in sequence, which makes the process too complicated, and the repeatability of its preparation and the stability of the coating quality are not high. The stress superposition effect of secondary remelting makes the coating more prone to cracking and peeling, so although its strengthening effect is better than that of laser remelting, this technology has not been widely used. For example, Gao Yang et al. (Gao Yang, Xie Lun, Tong Baiyun, et al. Research on Microstructure of Laser Cladding Zirconia Thermal Barrier Coating[J]. Journal of Aeronautical Materials, 2003, 23(3): 1-4. Gao Yang, Pan Feng, Liang Yong, et al. Microstructure and Oxidation Properties of Laser Cladding Thermal Barrier Coating on Superalloy Surface[J]. Journal of Aeronautical Materials, 2003, 21(1):4-7. The effect of layer structure and oxidation performance. In the test, after sandblasting the substrate, the NiCoCrAlY alloy layer was first plasma sprayed, and then remelted with a 5KW continuous_CO2 laser; after the surface of the remelted alloy layer was sandblasted,_ZrO2 ceramic powder was plasma sprayed on the surface, Then the paint is blackened and laser remelted again. The results show that directional epitaxial growth and closely packed columnar crystal zirconia ceramic layer were obtained by laser rapid melting and solidification. There is an aluminum oxide layer between the NiCoCrAlY bonding layer and the columnar crystals, which ensures the connection between the columnar crystals and the NiCoCrAlY layer. In addition, the zirconia layer and the NiCoCrAlY bonding layer, and the bonding layer and the substrate are all metallurgical bonds. The high temperature oxidation performance test shows that the oxidation kinetics of the laser remelted sample approximately obeys the parabolic rate equation. At 1200℃, the oxidation resistance of laser remelted thermal barrier coatings in air is significantly higher than that of plasma sprayed thermal barrier coatings.

众多的研究表明裂纹的产生和涂层的剥落是激光重熔等离子喷涂热障涂层最棘手的问题。为了获得质量优异、无缺陷或少缺陷的激光重熔热障涂层，一方面应从理论上对激光重熔技术理论基础的快速凝固理论及复合涂层界面精细结构作深入的研究，揭示激光重熔过程的本质；另一方面，应从工艺上对涂层的构成与质量进行控制与改进，以减少重熔后的热应力和组织应力。目前所采用的抑制激光重熔（熔覆）开裂的方法主要有：调整应力状态，尽可能降低拉应力；优化工艺方法和参数；合理设计熔覆层以及改变激光作用模式等。调整熔覆层应力状态常用的措施是对试样进行预热和/或缓冷处理，如通过保温箱的预热和/或缓冷，发明人提出了一种通过改变激光能量密度分布来控制熔覆层裂纹的方法（王东生,田宗军,王泾文,等.一种通过改变激光能量密度分布控制熔覆层裂纹的方法[J].中国激光,2011,38(1):0103004.）。结果表明：用均布光斑熔覆呈激光加工典型的快速加热、快速冷却特征，而采用凸字形光斑可在一定程度上起到了预热、缓冷的效果，从而降低熔覆区与非熔覆区的温度梯度，另外，在熔覆效果相当的前提下，其熔覆层热应力也较小，因而可以有效的减小熔覆层的开裂趋势。采用感应加热辅助激光熔覆的方法，即感应预热基材的同时进行激光熔覆，该方法不仅可使熔覆效率大大提高而且也能获得了无裂纹的熔覆层。Numerous studies have shown that crack generation and coating peeling are the most difficult problems of laser remelted plasma sprayed thermal barrier coatings. In order to obtain laser remelting thermal barrier coatings with excellent quality, no defects or few defects, on the one hand, it is necessary to conduct in-depth research on the theoretical basis of laser remelting technology, the rapid solidification theory and the fine structure of the composite coating interface. The essence of the melting process; on the other hand, the composition and quality of the coating should be controlled and improved from the process to reduce the thermal stress and structural stress after remelting. The methods currently used to suppress laser remelting (cladding) cracking mainly include: adjusting the stress state to reduce the tensile stress as much as possible; optimizing process methods and parameters; rationally designing the cladding layer and changing the laser action mode, etc. The common measure to adjust the stress state of the cladding layer is to preheat and/or slowly cool the sample, such as through the preheating and/or slow cooling of the incubator. The inventor proposed a method to control the melting temperature by changing the laser energy density distribution. The method of coating cracks (Wang Dongsheng, Tian Zongjun, Wang Jingwen, et al. A method of controlling cladding layer cracks by changing the laser energy density distribution [J]. China Laser, 2011,38(1):0103004.). The results show that the cladding with evenly distributed light spots presents the typical characteristics of rapid heating and rapid cooling in laser processing, while the use of convex-shaped light spots can play a role in preheating and slow cooling to a certain extent, thereby reducing the cladding area and non-cladding area. In addition, under the premise that the cladding effect is equivalent, the thermal stress of the cladding layer is also small, so the cracking tendency of the cladding layer can be effectively reduced. The method of induction heating assisted laser cladding is adopted, that is, laser cladding is performed while induction preheating the substrate. This method can not only greatly improve the cladding efficiency but also obtain a crack-free cladding layer.

美国的Grilloud等（Grilloud R,Gonseth D,Dekumbis R,et al.Apparatus forproducing a surface layer on a metallic workpiece[P].US Patent5224997,1993:l-16.）（Grilloud R,Gonseth D,Dekumbis R,等.一种金属工作表面制备涂层的装置[P].美国专利5224997,1993:l-16.）人率先提出了感应加热辅助激光熔覆技术，该技术集成了激光熔覆和感应加热的优势，能够弥补单纯激光熔覆能量不足及热源分布不利的缺点，具有工艺稳定性好、易于形成冶金结合、容易获得无裂纹的熔覆涂层等优点，因此具有很好的发展前途。Bernal工艺研究所对感应辅助加热激光熔覆的裂纹行为进行了研究（Zhang Y.Eliminating cladding cracks:pre-heating and stress analysis[C].ICALEO 2001,Section D:1-10.）（Zhang Y.涂除熔覆裂纹：预热和应力分析[C].2001年激光和电子光学应用国际大会,D:1-10.）。研究表明，感应加热辅助激光熔覆层拉伸应力大大降低，对于熔覆材料MM10(含碳量2.45%)可以获得高硬度免裂纹的熔覆层，预热工艺对熔覆层的显微组织和耐磨性没有显著影响。丁向东等（丁向东,连建设,关振中等.圆柱体中频感应重熔与激光强化的复合新工艺[[J].焊接学报,2000,21(4):5-8.）对国产Ni60A自熔合金粉末的热喷涂层，进行了中频感应重熔与激光强化复合加工的试验研究。试验研究表明，复合加工具有中频感应重熔的优点，能够获得大面积的表面光洁的覆层，且覆层组织均匀，无裂纹，与基体存在良好的冶金结合；同时，复合加工又具有激光重熔的优点，不仅降低了覆层中的孔隙率，而且提高了熔覆层与基体的结合强度，使之具有较好的抗磨损能力。华中科技大学在相关方面做了较多的研究工作，周圣丰（Zhou S F,Huang Y J,Zeng X Y,et al.Microstructure characteristics of Ni-based WC composite coatings by laser inductionhybrid rapid cladding[J].Materials Science and Engineering A,2008,480:564-572.）（Zhou S F,Huang Y J,Zeng X Y,等.激光感应复合快速熔覆Ni基WC复合涂层组织特征[J].材料科学与工程A,2008,480:564-572.）对感应加热辅助激光熔覆Ni基WC复合层进行了研究，而黄永俊（Huang Y J,Y S F.Modeling the geometric formation and powderdeposition mass in laser induction hybrid cladding[J].Journal of Mechanical Scienceand Technology,2012,26(8):2347-2351.）（Huang Y J,Yuan S F.激光感应复合熔覆宏观尺寸及粉末沉积率模型[J].机械科学与技术杂志,2012,26(8):2347-2351.）则重点研究了感应加热辅助激光熔覆的机理。Grilloud et al. (Grilloud R, Gonseth D, Dekumbis R, et al. Apparatus for producing a surface layer on a metallic workpiece [P]. US Patent 5224997, 1993: l-16.) (Grilloud R, Gonseth D, Dekumbis R, etc. A device for preparing a coating on a metal working surface [P]. US Patent 5224997, 1993: l-16.) who first proposed the induction heating assisted laser cladding technology, which integrates the laser cladding and induction heating Advantages, it can make up for the shortcomings of insufficient laser cladding energy and unfavorable heat source distribution. It has the advantages of good process stability, easy to form metallurgical bonding, and easy to obtain crack-free cladding coatings, so it has a good development prospect. The Bernal Institute of Technology conducted a study on the crack behavior of induction-assisted heating laser cladding (Zhang Y. Eliminating cladding cracks: pre-heating and stress analysis [C]. ICALEO 2001, Section D: 1-10.) (Zhang Y. Removal of Cladding Cracks: Preheating and Stress Analysis [C]. 2001 International Conference on Applications of Lasers and Electron Optics, D: 1-10.). Studies have shown that the tensile stress of the laser cladding layer assisted by induction heating is greatly reduced. For the cladding material MM10 (2.45% carbon content), a cladding layer with high hardness and no cracks can be obtained. and wear resistance were not significantly affected. Ding Xiangdong et al. (Ding Xiangdong, Lian Jianshe, Guan Zhenzhong, etc. A new composite process of medium-frequency induction remelting and laser strengthening for cylinders [[J]. Journal of Welding, 2000, 21 (4): 5-8.) on domestic Ni60A self-melting The thermal spraying coating of alloy powder has been carried out the experimental research of medium frequency induction remelting and laser strengthening compound processing. Experimental research shows that composite processing has the advantages of medium frequency induction remelting, and can obtain a large area of smooth coating, and the coating structure is uniform, without cracks, and has a good metallurgical bond with the substrate; at the same time, composite processing has the advantages of laser remelting. The advantage of melting not only reduces the porosity in the cladding layer, but also improves the bonding strength between the cladding layer and the substrate, so that it has better wear resistance. Huazhong University of Science and Technology has done more research work in related fields, Zhou S F, Huang Y J, Zeng X Y, et al. Microstructure characteristics of Ni-based WC composite coatings by laser induction hybrid rapid cladding[J].Materials Science and Engineering A,2008,480:564-572.) (Zhou S F, Huang Y J, Zeng X Y, et al. Microstructure characteristics of laser-induced compound rapid cladding Ni-based WC composite coatings[J].Materials Science and Engineering A, 2008, 480:564-572.) studied the induction heating assisted laser cladding Ni-based WC composite layer, and Huang Yongjun (Huang Y J, Y S F.Modeling the geometric formation and powderdeposition mass in laser induction hybrid cladding[J].Journal of Mechanical Science and Technology,2012,26(8):2347-2351.) (Huang Y J, Yuan S F. Laser induction composite cladding macroscopic size and powder deposition rate model[J].Mechanical Journal of Science and Technology, 2012,26(8):2347-2351.) focuses on the mechanism of induction heating assisted laser cladding.

综上所述，经对现有技术文献的检索发现，常见的对等离子喷涂双层结构热障涂层强化方法有一次激光重熔强化和分步重熔强化，但传统的一次激光重熔只能强化表面陶瓷层，而分步强化不仅工艺复杂，而且涂层易产生裂纹，都有明显的不足。In summary, after searching the existing technical literature, it is found that the common strengthening methods for plasma spraying double-layer structure thermal barrier coatings include one-time laser remelting strengthening and step-by-step remelting strengthening, but the traditional one-time laser remelting only It can strengthen the surface ceramic layer, but the step-by-step strengthening process is not only complicated, but also the coating is prone to cracks, which has obvious shortcomings.

发明内容Contents of the invention

本发明的目的在于克服现有技术的不足，提供了一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法及其装置，达到增加能量输入及改善重熔层质量的双重效果。本发明是通过以下技术方案实现的，本发明包括以下步骤：The purpose of the present invention is to overcome the deficiencies of the prior art and provide a plasma sprayed double-layer structure thermal barrier coating laser remelting one-step intensified processing method and its device, which achieve the dual effects of increasing energy input and improving the quality of the remelted layer. The present invention is achieved through the following technical solutions, and the present invention comprises the following steps:

（1）在经过净化和活化处理后的基体表面上采用等离子喷涂工艺依次喷涂双层结构热障涂层；(1) On the surface of the substrate after purification and activation treatment, the plasma spraying process is used to spray the double-layer structure thermal barrier coating in sequence;

（2）采用感应加热辅助激光重熔复合工艺对双层结构热障涂层进行重熔。(2) The double-layer structure thermal barrier coating was remelted by induction heating assisted laser remelting composite process.

所述步骤（1）中，双层结构热障涂层的面层是表面陶瓷层，中间层是金属粘结层。In the step (1), the surface layer of the double-layer structure thermal barrier coating is a surface ceramic layer, and the middle layer is a metal bonding layer.

作为本发明的优选方式之一，所述等离子喷涂工艺选自大气等离子喷涂、保护气氛等离子喷涂、真空等离子喷涂、水稳等离子喷涂中的一种。As one of the preferred modes of the present invention, the plasma spraying process is selected from one of atmospheric plasma spraying, protective atmosphere plasma spraying, vacuum plasma spraying, and hydrostabilized plasma spraying.

作为本发明的优选方式之一，所述基体为镍基高温合金，所述表面陶瓷层是ZrO₂基陶瓷材料，金属粘结层为McrAlY合金。As one of the preferred modes of the present invention, the substrate is a nickel-based superalloy, the surface ceramic layer is a ZrO₂ -based ceramic material, and the metal bonding layer is a McrAlY alloy.

一种等离子喷涂双层结构热障涂层激光重熔一步强化加工的装置，包括感应加热线圈、激光头、高频感应加热器，所述高频感应加热器和感应加热线圈相连，感应加热线圈固定在激光头上，激光头发射的激光位于感应加热线圈的加热区域中央。A device for plasma spraying a double-layer thermal barrier coating with laser remelting and one-step strengthening processing, including an induction heating coil, a laser head, and a high-frequency induction heater. The high-frequency induction heater is connected to the induction heating coil, and the induction heating coil Fixed on the laser head, the laser emitted by the laser head is located in the center of the heating area of the induction heating coil.

本发明相比现有技术具有以下优点：本发明首先在经过预处理的基体表面上依次等离子喷涂金属粘结层和表面陶瓷层，然后采用感应加热辅助激光重熔复合工艺对热障涂层进行处理，可以同时熔化双层结构热障涂层中陶瓷层和粘结层，使陶瓷层与粘结层界面、粘结层与基体界面同时达到冶金结合；采用感应加热辅助激光重熔复合工艺，能够弥补单纯激光重熔能量不足的缺点，从而使一次激光重熔可以同时熔化双层结构热障涂层中陶瓷层和粘结层，使陶瓷层与粘结层界面、粘结层与基体界面同时达到冶金结合的一步强化目的；把激光束作用于感应加热区域中部，可以弥补激光热源分布不利的不足，从而减小重熔区域与周围的温度梯度，另外较大的感应加热区域相当于对熔池起到了预热和缓冷作用，从而可有效减小重熔热障涂层开裂趋势；具有工艺简单、稳定性好、重熔涂层质量高等优点，因此有望应用于航空涡轮发动机叶片等关键热端零部件表面。Compared with the prior art, the present invention has the following advantages: first, the present invention sequentially plasma-sprays the metal bonding layer and the surface ceramic layer on the surface of the pretreated substrate, and then adopts the induction heating-assisted laser remelting composite process to carry out the thermal barrier coating The treatment can melt the ceramic layer and the adhesive layer in the double-layer structure thermal barrier coating at the same time, so that the interface between the ceramic layer and the adhesive layer, and the interface between the adhesive layer and the substrate can achieve metallurgical bonding at the same time; the laser remelting composite process assisted by induction heating is adopted, It can make up for the shortcomings of insufficient laser remelting energy, so that a laser remelting can melt the ceramic layer and the bonding layer in the double-layer thermal barrier coating at the same time, so that the interface between the ceramic layer and the bonding layer, and the bonding layer and the substrate interface At the same time, the purpose of one-step strengthening of metallurgical bonding is achieved; the laser beam is applied to the middle of the induction heating area, which can make up for the disadvantage of the unfavorable distribution of the laser heat source, thereby reducing the temperature gradient between the remelting area and the surrounding area. In addition, a larger induction heating area is equivalent to The melt pool plays the role of preheating and slow cooling, which can effectively reduce the cracking tendency of the remelted thermal barrier coating; it has the advantages of simple process, good stability, and high quality of the remelted coating, so it is expected to be applied to aero turbine engine blades and other key Hot-end part surface.

附图说明Description of drawings

图1是本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.

具体实施方式Detailed ways

下面对本发明的实施例作详细说明，本实施例在以本发明技术方案为前提下进行实施，给出了详细的实施方式和具体的操作过程，但本发明的保护范围不限于下述的实施例。The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

实施例1Example 1

如图1所示，本发明的加工装置，包括感应加热线圈2、激光头3、高频感应加热器4，所述高频感应加热器4和感应加热线圈2相连，感应加热线圈2固定在激光头3上，激光头3发射的激光位于感应加热线圈2的加热区域中央，试样5固定在工作台7上，本装置还使用数控控制台1分别控制激光器6和高频感应加热器4，激光器6和激光头3相连。As shown in Figure 1, processing device of the present invention comprises induction heating coil 2, laser head 3, high-frequency induction heater 4, and described high-frequency induction heater 4 is connected with induction heating coil 2, and induction heating coil 2 is fixed on On the laser head 3, the laser emitted by the laser head 3 is located in the center of the heating area of the induction heating coil 2, and the sample 5 is fixed on the workbench 7. This device also uses the numerical control console 1 to control the laser 6 and the high-frequency induction heater 4 respectively. , the laser 6 is connected to the laser head 3.

在镍基高温合金基体表面采用感应加热辅助激光重熔复合工艺一步强化等离子喷涂MCrAlY/ZrO₂双层结构热障涂层，具体步骤如下：The MCrAlY/ZrO₂ double-layer structure thermal barrier coating was sprayed on the surface of the nickel-based superalloy substrate by induction heating-assisted laser remelting composite process in one step. The specific steps are as follows:

（1）将电火花线切割至40mm×40mm×8mm的GH4033镍基高温合金基体表面进行打磨、除油、喷砂和清洗等预处理；(1) The surface of the GH4033 nickel-based superalloy substrate that is wire-cut to 40mm×40mm×8mm is pretreated by grinding, degreasing, sandblasting and cleaning;

（2）在镍基高温合金基体表面用美国普莱克斯公司生产的3710型大气等离子喷涂系统依次喷涂MCrAlY金属粘结层和ZrO₂表面陶瓷层，MCrAlY金属粘结层的名义成分为：Ni-20Co-18Cr-15Al-2Y₂O₃，质量分数，%。喷涂工艺参数见表1；(2) On the surface of the nickel-based superalloy substrate, use the 3710 atmospheric plasma spraying system produced by Praxair, USA to spray the MCrAlY metal bonding layer and the ZrO₂ surface ceramic layer in sequence. The nominal composition of the MCrAlY metal bonding layer is: Ni- 20Co-18Cr-15Al-2Y₂ O₃ , mass fraction, %. The spraying process parameters are shown in Table 1;

（3）感应加热辅助激光重熔采用SLCF-X12×25型CO₂激光加工机，Hac高频感应加热器4，激光光斑尺寸通过调节焦距来实现，而激光功率，扫描速度及高频感应加热器4功率由数控控制台1调节，工艺参数见表2。通过激光重熔处理使双层结构热障涂层中ZrO₂表面陶瓷层和MCrAlY金属粘结层同时熔化，使ZrO₂表面陶瓷层与MCrAlY金属粘结层界面、MCrAlY金属粘结层与GH4033镍基高温合金基体界面同时达到冶金结合，达到一步强化效果，同时重熔热障涂层表面只有少量网状裂纹，有效的减小了热障涂层在激光重熔过程中的开裂趋势。(3) Induction heating assisted laser remelting adopts SLCF-X12×25 CO₂ laser processing machine, Hac high frequency induction heater 4, laser spot size is realized by adjusting focal length, while laser power, scanning speed and high frequency induction heating The power of the device 4 is adjusted by the numerical control console 1, and the process parameters are shown in Table 2. Through laser remelting treatment, the ZrO₂ surface ceramic layer and MCrAlY metal bonding layer in the double-layer structure thermal barrier coating are melted at the same time, so that the ZrO₂ surface ceramic layer and MCrAlY metal bonding layer interface, MCrAlY metal bonding layer and GH4033 nickel The base superalloy matrix interface achieves metallurgical bonding at the same time, achieving a one-step strengthening effect. At the same time, there are only a few network cracks on the surface of the remelted thermal barrier coating, which effectively reduces the cracking tendency of the thermal barrier coating during laser remelting.

实施例2Example 2

本实施例在镍基高温合金基体表面采用感应加热辅助激光重熔复合工艺一步强化等离子喷涂MCrAlY/ZrO₂-MgO双层结构热障涂层，具体步骤如下：In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying of MCrAlY/ZrO₂ -MgO double-layer structure thermal barrier coating on the surface of the nickel-based superalloy substrate. The specific steps are as follows:

（1）将GH4033镍基高温合金基体表面进行打磨、除油、喷砂和清洗等预处理；(1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

（2）在镍基高温合金基体表面依次喷涂MCrAlY金属粘结层和ZrO₂-22%MgO（质量分数）表面陶瓷层，喷涂工艺参数见表1；(2) Spray MCrAlY metal bonding layer and ZrO₂ -22%MgO (mass fraction) surface ceramic layer on the surface of nickel-based superalloy substrate in sequence, and the spraying process parameters are shown in Table 1;

（3）通过激光重熔处理使双层结构热障涂层中ZrO₂-22%MgO表面陶瓷层和MCrAlY金属粘结层同时熔化，使ZrO₂-22%MgO表面陶瓷层与MCrAlY金属粘结层界面、MCrAlY金属粘结层与GH4033镍基高温合金基体界面同时达到冶金结合，达到一步强化效果，另外重熔热障涂层表面只有少量网状裂纹，有效的减小了热障涂层在激光重熔过程中的开裂趋势。工艺参数见表2。(3) Through laser remelting treatment, the ZrO₂ -22%MgO surface ceramic layer and the MCrAlY metal bonding layer in the double-layer structure thermal barrier coating are melted at the same time, so that the ZrO₂ -22%MgO surface ceramic layer is bonded to the MCrAlY metal The layer interface, MCrAlY metal bonding layer and GH4033 nickel-based superalloy substrate interface achieve metallurgical bonding at the same time, achieving a one-step strengthening effect. In addition, there are only a few network cracks on the surface of the remelted thermal barrier coating, which effectively reduces the thermal barrier coating. Cracking tendency during laser remelting. The process parameters are shown in Table 2.

其他实施方式和实施例1相同。Other implementations are the same as in Example 1.

实施例3Example 3

本实施例在镍基高温合金基体表面采用感应加热辅助激光重熔复合工艺一步强化等离子喷涂MCrAlY/ZrO₂-CaO双层结构热障涂层，具体步骤如下：In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying of MCrAlY/ZrO₂ -CaO double-layer thermal barrier coating on the surface of the nickel-based superalloy substrate. The specific steps are as follows:

（1）将GH4033镍基高温合金基体表面进行打磨、除油、喷砂和清洗等预处理；(1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

（2）在镍基高温合金基体表面依次喷涂MCrAlY金属粘结层和ZrO₂-15%CaO（质量分数）表面陶瓷层，喷涂工艺参数见表1；(2) Spray MCrAlY metal bonding layer and ZrO₂ -15%CaO (mass fraction) surface ceramic layer on the surface of nickel-based superalloy substrate in sequence, and the spraying process parameters are shown in Table 1;

（3）通过激光重熔处理使双层结构热障涂层中ZrO₂-22%MgO表面陶瓷层和MCrAlY金属粘结层同时熔化，使ZrO₂-15%CaO表面陶瓷层与MCrAlY金属粘结层界面、MCrAlY金属粘结层与GH4033镍基高温合金基体界面同时达到冶金结合，达到一步强化效果，另外重熔热障涂层表面只有少量网状裂纹，有效的减小了热障涂层在激光重熔过程中的开裂趋势。工艺参数见表2。(3) Through laser remelting treatment, the ZrO₂ -22%MgO surface ceramic layer and the MCrAlY metal bonding layer in the double-layer structure thermal barrier coating are melted at the same time, so that the ZrO₂ -15%CaO surface ceramic layer is bonded to the MCrAlY metal The layer interface, MCrAlY metal bonding layer and GH4033 nickel-based superalloy substrate interface achieve metallurgical bonding at the same time, achieving a one-step strengthening effect. In addition, there are only a few network cracks on the surface of the remelted thermal barrier coating, which effectively reduces the thermal barrier coating. Cracking tendency during laser remelting. The process parameters are shown in Table 2.

其他实施方式和实施例1相同。Other implementations are the same as in Example 1.

实施例4Example 4

本实施例在镍基高温合金基体表面采用感应加热辅助激光重熔复合工艺一步强化等离子喷涂MCrAlY/ZrO₂-Y₂O₃双层结构热障涂层，具体步骤如下：In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying MCrAlY/ZrO₂ -Y₂ O₃ double-layer structure thermal barrier coating on the surface of the nickel-based superalloy substrate. The specific steps are as follows:

（1）将GH4033镍基高温合金基体表面进行打磨、除油、喷砂和清洗等预处理；(1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

（2）在镍基高温合金基体表面依次喷涂MCrAlY金属粘结层和Y₂O₃-7%ZrO₂（质量分数）表面陶瓷层，喷涂工艺参数见表1；(2) Spray MCrAlY metal bonding layer and Y₂ O₃ -7%ZrO₂ (mass fraction) surface ceramic layer on the surface of nickel-based superalloy substrate in sequence, and the spraying process parameters are shown in Table 1;

（3）通过激光重熔处理使双层结构热障涂层中Y₂O₃-7%ZrO₂表面陶瓷层和MCrAlY金属粘结层同时熔化，使Y₂O₃-7%ZrO₂表面陶瓷层与MCrAlY金属粘结层界面、MCrAlY金属粘结层与GH4033镍基高温合金基体界面同时达到冶金结合，达到一步强化效果，另外重熔热障涂层表面只有少量网状裂纹，有效的减小了热障涂层在激光重熔过程中的开裂趋势。工艺参数见表2。(3) The Y₂ O₃ -7%ZrO₂ surface ceramic layer and the MCrAlY metal bonding layer in the double-layer structure thermal barrier coating are melted simultaneously by laser remelting treatment, so that the Y₂ O₃ -7%ZrO₂ surface ceramic layer The interface between the MCrAlY metal bonding layer and the MCrAlY metal bonding layer, and the interface between the MCrAlY metal bonding layer and the GH4033 nickel-based superalloy substrate achieve metallurgical bonding at the same time, achieving a one-step strengthening effect. Cracking tendency of thermal barrier coatings during laser remelting. The process parameters are shown in Table 2.

其他实施方式和实施例1相同。Other implementations are the same as in Example 1.

实施例5Example 5

本实施例在镍基高温合金基体表面采用感应加热辅助激光重熔复合工艺一步强化等离子喷涂MCrAlY/ZrO₂-CeO₂双层结构热障涂层，具体步骤如下：In this example, the induction heating-assisted laser remelting composite process is used to intensify the plasma spraying of MCrAlY/ZrO₂ -CeO₂ double-layer structure thermal barrier coating on the surface of the nickel-based superalloy substrate. The specific steps are as follows:

（1）将GH4033镍基高温合金基体表面进行打磨、除油、喷砂和清洗等预处理；(1) The surface of the GH4033 nickel-based superalloy substrate is pretreated by grinding, degreasing, sandblasting and cleaning;

（2）在镍基高温合金基体表面依次喷涂MCrAlY金属粘结层和ZrO₂-10%CeO₂（质量分数）表面陶瓷层，喷涂工艺参数见表1；(2) Spray MCrAlY metal bonding layer and ZrO₂ -10%CeO₂ (mass fraction) surface ceramic layer on the surface of nickel-based superalloy substrate in sequence, and the spraying process parameters are shown in Table 1;

（3）通过激光重熔处理使双层结构热障涂层中ZrO₂-10%CeO₂表面陶瓷层和MCrAlY金属粘结层同时熔化，使ZrO₂-10%CeO₂表面陶瓷层与MCrAlY金属粘结层界面、MCrAlY金属粘结层与GH4033镍基高温合金基体界面同时达到冶金结合，达到一步强化效果，另外重熔热障涂层表面只有少量网状裂纹，有效的减小了热障涂层在激光重熔过程中的开裂趋势。工艺参数见表2。(3) The ZrO₂ -10%CeO₂ surface ceramic layer and the MCrAlY metal bonding layer in the double-layer structure thermal barrier coating are melted simultaneously by laser remelting treatment, so that the ZrO₂ -10%CeO₂ surface ceramic layer and MCrAlY metal The bonding layer interface, the MCrAlY metal bonding layer and the GH4033 nickel-based superalloy substrate interface achieve metallurgical bonding at the same time, achieving a one-step strengthening effect. In addition, there are only a few network cracks on the surface of the remelted thermal barrier coating, which effectively reduces the thermal barrier coating. Cracking tendency of layers during laser remelting. The process parameters are shown in Table 2.

其他实施方式和实施例1相同。Other implementations are the same as in Example 1.

表1等离子喷涂参数Table 1 Plasma Spraying Parameters

工艺参数Process parametersMCrAlYMCrAlYZrO_2ZrO2ZrO₂-MgOZrO₂ -MgOZrO₂-CaOZrO₂ -CaOZrO₂-Y₂O₃ZrO₂ -Y₂ O₃ZrO₂-CeO₂ZrO₂ -CeO₂电流/ACurrent/A710710920920920920920920920920920920电压/VVoltage/V424242424242424242424242主气,Ar/PSIMain gas, Ar/PSI656545454545454545454545

辅气,He/PSIAuxiliary gas, He/PSI115115150150150150150150150150150150载体气,Ar/PSICarrier gas, Ar/PSI454545454545454545454545送粉率/(r·min^-1)Powder feeding rate/(r·min^-1 )223333333333喷涂距离/mmSpray distance/mm110110100100100100100100100100100100喷枪移动速度/(mm·s^-1)Spray gun moving speed/(mm s^-1 )100100100100100100100100100100100100涂层厚度/μmCoating thickness/μm100100350350350350350350350350350350

表2感应加热辅助激光重熔复合工艺参数Table 2 Induction heating assisted laser remelting composite process parameters

Claims (5)

Translated fromChinese

1.一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法，其特征在于，包括以下步骤：1. A plasma sprayed double-layer structure thermal barrier coating laser remelting one-step strengthening processing method is characterized in that it comprises the following steps:（1）在经过净化和活化处理后的基体表面上采用等离子喷涂工艺依次喷涂双层结构热障涂层；(1) On the surface of the substrate after purification and activation treatment, the plasma spraying process is used to spray the double-layer structure thermal barrier coating in sequence;（2）采用感应加热辅助激光重熔复合工艺对双层结构热障涂层进行重熔。(2) The double-layer structure thermal barrier coating was remelted by induction heating assisted laser remelting composite process.2.根据权利要求1所述的一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法，其特征在于，所述步骤（1）中，双层结构热障涂层的面层是表面陶瓷层，中间层是金属粘结层。2. A plasma sprayed double-layer structure thermal barrier coating laser remelting one-step strengthening processing method according to claim 1, characterized in that, in the step (1), the surface layer of the double-layer structure thermal barrier coating Is the surface ceramic layer, the middle layer is the metal bonding layer.3.根据权利要求1所述的一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法，其特征在于，所述基体为镍基高温合金，所述表面陶瓷层是ZrO₂基陶瓷材料，金属粘结层为McrAlY合金。3. A kind of plasma spraying double-layer structure thermal barrier coating laser remelting one-step strengthening processing method according to claim 1, it is characterized in that, described substrate is nickel-based superalloy, and described surface ceramic layer is ZrO₂ base Ceramic material, the metal bonding layer is McrAlY alloy.4.根据权利要求1所述的一种等离子喷涂双层结构热障涂层激光重熔一步强化加工方法，其特征在于，所述等离子喷涂工艺选自大气等离子喷涂、保护气氛等离子喷涂、真空等离子喷涂、水稳等离子喷涂中的一种。4. A plasma spraying double-layer structure thermal barrier coating laser remelting one-step strengthening processing method according to claim 1, characterized in that, the plasma spraying process is selected from atmospheric plasma spraying, protective atmosphere plasma spraying, vacuum plasma One of spray coating and water stabilized plasma spray coating.5.一种如权利要求1所述的等离子喷涂双层结构热障涂层激光重熔一步强化加工的装置，其特征在于，包括感应加热线圈、激光头、高频感应加热器，所述高频感应加热器和感应加热线圈相连，感应加热线圈固定在激光头上，激光头发射的激光位于感应加热线圈的加热区域中央。5. A device for laser remelting one-step strengthening processing of plasma sprayed double-layer structure thermal barrier coating as claimed in claim 1, characterized in that it includes an induction heating coil, a laser head, and a high-frequency induction heater, and the high The frequency induction heater is connected with the induction heating coil, the induction heating coil is fixed on the laser head, and the laser emitted by the laser head is located in the center of the heating area of the induction heating coil.