A kind of aqueous nickel welding paste for stainless steel brazingTechnical field
The present invention relates to a kind of stainless steel braze welding soldering paste, particularly a kind of stainless steel use solder paste.
Background technology
Soldering paste can meet the place in the mode of injection with the weldering that soldering paste quantitatively is applied to workpiece to be welded by automatic control as a kind of brazing material of paste, thereby realizes continuous batch welding production.Along with the automaticity of welding production technology improves constantly, demand to the welding material product is more and more diversified, the paste scolder can significantly be enhanced productivity and steady quality in order to the automatic brazing production of the parts complex-shaped, that weld seam is intensive, dimensional accuracy is high.The formation efficiency of automatic brazing is manual more than tens of times, and can guarantee every batch of steady quality of product.In addition, the soldering automated production can reduce toxic emission widely, makes and produces Environmental Safety more.
Red copper soldering paste, silver paste once were widely used in stainless soldering.But,, influence the outward appearance of product because the color and luster and the stainless steel of red copper soldering paste are obviously inconsistent; And the silver paste price is too expensive, and therefore, nickel soldering paste is more and more wider in the range of application of stainless steel industry.The oiliness nickel soldering paste has following shortcoming in application process: because soldering paste viscosity is subject to the temperature Change influence, often cause soldering paste to cross rare or overdrying because of temperature is high or low, have a strong impact on the controllability and the manufacturability of feeding quantity, and smog is big in the oiliness soldering paste weld heating process, aggravating working environment, and the oiliness soldering paste is adhesion container, equipment etc. when using, and be difficult to clean, thereby market is to the demand progressively growth of water-based nickel soldering paste.
Summary of the invention
The lotion that the purpose of this invention is to provide a kind of stainless steel braze welding evenly is difficult for layering, and is reinforced smooth and easy, be easy to clean, and the weld seam color and luster water-based solder paste consistent with stainless steel.
Water-based solder paste of the present invention is that 90～96% solder is formed with 4～10% the cream binding agent that becomes by percentage by weight; Described solder comprises Cr:4～18%, Fe:0.2～4%, C:0.01～0.1%, Si:0.1～5% by weight percentage, P:5～12%, and surplus is Ni; Become the cream binding agent by weight percentage, be made up of following ingredients: molecular weight is 10000～1000000 carboxymethyl cellulose and methylcellulose mixture 28～58%, aqueous solvent 40～70%, lubricant 1～10% or molecular weight are one or more in 1000～10000 polyacrylamide, polyacrylic acid, polymethylacrylic acid and copolymer thereof, polyvinyl alcohol or the polyethylene glycol oxide: 25～55%, aqueous solvent 40～70%, lubricant 1～10%.
Described solder contains Zr:0.01～0.5%.
Described solder contains V:0.01～0.5%.
Described solder contains B:0.01～0.5%.
Above-mentioned aqueous solvent is one or more in water, ethanol, ethylene glycol, glycerine, propane diols or the isopropyl alcohol.
Above-mentioned lubricant is one or both in water-based silicone oil or the hydrophily self-emulsifying silicone oil.
Above-mentioned water-based silicone oil is polyether-modified methyl-silicone oil, polyether-modified ethyl silicon oil, polyether-modified dimethicone, polyether-modified polymethylphenyl siloxane fluid, polyether modified amino silicone oil or polyether-modified hydroxy silicon oil.
Above-mentioned hydrophily self-emulsifying silicone oil is hydrophily self-emulsifying methyl-silicone oil, hydrophily self-emulsifying ethyl silicon oil, hydrophily self-emulsifying dimethicone, hydrophily self-emulsifying polymethylphenyl siloxane fluid, hydrophily self-emulsifying amido silicon oil or hydrophily self-emulsifying hydroxy silicon oil.
Soldering alloyed metal powder is the chief component of soldering paste, and soldering processes and welding quality are had fundamental influence.Solder of the present invention is matrix material with Ni, adds Cr, Fe, C, Si, P and Zr, V, B; In becoming the cream binding agent, add lubricant, can increase solder powder and the adhesion that becomes the cream binding agent, can avoid paste separating, the sedimentation of scolder is less than 1mm in half a year, on automatic charging equipment, can not stop up reinforced pipeline in 24 hours by continuous charging simultaneously, it is smooth and easy to guarantee to feed in raw material, for automation, extensive welding are produced assurance is provided.
Specific embodiments
Solder: press the solder ingredient composition, melting under the vacuum condition, inert gas atomizer molten metal bath stream is prepared into the metal alloy powder.
Become the cream binding agent: choose polymer and aqueous solvent, the mix lubricant of different molecular weight and be heated to 60～80 ℃, fully stir and make into the cream binding agent.
Synthetic solder paste: in proportion solder is joined in the cream binding agent, evenly stir soldering paste.
Embodiment 1
Cr:11%, Fe:1.5%, C:1.0%, Si:2.0%, P:9.0%, surplus is Ni.Account for 5.6% one-tenth cream binding agent of soldering paste gross weight: the polyvinyl alcohol 10% of molecular weight 1500, the polyacrylamide 20% of molecular weight 6000, water 35%, isopropyl alcohol 10%, glycerine 20%, polyether-modified dimethicone 5%.
Embodiment 2
Cr:15%, Fe:0.2%, C:0.01%, Si:0.4%, P:8%, Zr:0.01%, B:0.03%, surplus is Ni.Account for 6% one-tenth cream binding agent of soldering paste gross weight: the carboxymethyl cellulose 15% of molecular weight 100000, the methylcellulose 15% of molecular weight 10000, water 55%, glycerine 13%, polyether-modified methyl-silicone oil 2%.
Embodiment 3
Cr:12%, Fe:0.8%, C:0.04%, Si:0.8%, P:10%, V:0.04%, B:0.03%, surplus is Ni.Account for 5.25% one-tenth cream binding agent of soldering paste gross weight: the carboxymethyl cellulose 25% of molecular weight 10000, the methylcellulose 6% of molecular weight 100000, water 20%, isopropyl alcohol 26%, glycerine 18%, polyether-modified dimethicone 2.4%, hydrophily self-emulsifying methyl-silicone oil 2.6%.
Embodiment 4
Cr:10%, Fe:3.6%, C:0.05%, Si:4.2%, P:7%, Zr:0.35%, V:0.03%, surplus is Ni.Account for 4.85% one-tenth cream binding agent of soldering paste gross weight: the polyvinyl alcohol 15% of molecular weight 1000, the polyacrylamide 19% of molecular weight 6000, water 30%, isopropyl alcohol 15%, glycerine 20%, polyether-modified dimethicone 0.2%, hydrophily self-emulsifying amido silicon oil 0.8%.
Embodiment 5
Cr:8%, Fe:0.8%, C:0.09%, Si:3.1%, P:11%, V:0.02%, B:0.04%, surplus is Ni.Account for 5.8% one-tenth cream binding agent of soldering paste gross weight: the polyvinyl alcohol 35% of molecular weight 1000, water 25%, isopropyl alcohol 12%, glycerine 20%, hydrophily self-emulsifying dimethicone 8%.