JPS59121803A - High-frequency magnetic material - Google Patents

Abstract

PURPOSE:To keep a negative temperature coefficient and improve a density by adding a small amount of ZrO2 to a material which has a negative temperature coefficient of initial permeability. CONSTITUTION:To the composition, expressed by a chemical formula NixCoyFez O4 (where 0.8<=x<=1.2, 0.01<=y<=0.03, 1.8<=z<=2.2 and x+y+z=3), 2-4wt% of Bi2O3, 0.2-3wt% of SiO2 and 0.005-0.04 (expression of above chemical formula) of ZrO2 are added and baked. The material to which ZrO2 is added has a temperature coefficient of initial permeability which is uniformly negative in the range of 0-80 deg.C and has an improve density so that the strength of the product is improved.

Description

Translated fromJapanese

【発明の詳細な説明】本発明は高周波で用いられるフェライト磁心の温度係数
に関するものである。各種高周波回路のインダクタンス
素子は磁心としてのフェライトコアおよびボビンに巻回
されたコイルとより形成されている。このインダクタン
ス素子を使用した回路は特に、より高周波で動作するに
従い、周囲の温度変化に対して安定であることが重要で
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature coefficient of a ferrite magnetic core used at high frequencies. Inductance elements of various high frequency circuits are formed from a ferrite core serving as a magnetic core and a coil wound around a bobbin. Particularly as circuits using this inductance element operate at higher frequencies, it is important that they be stable against changes in ambient temperature.

温度変化に対して安定とするため従来採用されてきた手
段は以下である。すなわち通常コンデンサおよびインダ
クタンス素子の組み合せで回路が構成されているため、
両者を合せた温度係数が小さくなるように材質を選定す
るというものである。The following measures have been conventionally adopted to ensure stability against temperature changes. In other words, since the circuit is usually composed of a combination of capacitors and inductance elements,
The material is selected so that the combined temperature coefficient of both is small.

この選定は、一般にコンデンサの容量は負の温度係数を
もつことから、これに対応して素子のインダクタンス、
言いかえればフェライト磁心の初透磁率の温度係数が僅
か正（通常２０〜１００Ｘ　１０’／ｄｅｇ　）のもの
となることであった。しかしながらこの選定により得ら
れる回路全体の温度係数はフェライト磁心とコンデンサ
以外の他の部品、特にコルそのものの温度係数が正のた
め、充分満足出来るものとは言えない。この点をさらに
改善するためにはフェライト磁心の温度係数を負のもの
とすれば可能であるがこのような材料を得ることは困難
である。初透磁率の温度係数が負である材料としては、
特願昭５３−７２５６７．７２５６８があるが、これら
では密度が高々４．５　ｇ７ｃｍ３にしか過ぎず製品強
度に難点があった。This selection is based on the fact that capacitor capacitance generally has a negative temperature coefficient.
In other words, the temperature coefficient of the initial magnetic permeability of the ferrite magnetic core was slightly positive (usually 20 to 100 x 10'/deg). However, the temperature coefficient of the entire circuit obtained by this selection cannot be said to be fully satisfactory because the temperature coefficient of other components other than the ferrite core and the capacitor, especially the coil itself, is positive. In order to further improve this point, it is possible to make the temperature coefficient of the ferrite magnetic core negative, but it is difficult to obtain such a material. Materials with a negative temperature coefficient of initial permeability include:
There is Japanese Patent Application No. 53-72567.72568, but these had a density of only 4.5 g7cm@3 at most, and had a drawback in product strength.

本発明はこれにさらにＺｒＯ２を少量添加することによ
り、負の温度係数を維持しかつ密度の向上をはかるもの
である。The present invention aims to maintain a negative temperature coefficient and improve density by further adding a small amount of ZrO2.

以下に実施例を述べ説明する。Examples will be described below.

実施例１化学式でＮ　ｉＯ，’ｌ’ｌ　ＣＯｏ、６２Ｆ　ｅ　＋
、ｑｇＯ＋となるようにＮｉｐ、ＣＯ２Ｏ３，Ｆｅ２０
ａを秤量し、これにＢ’　２０ｇ　　０．５ｗｔ％、　
Ｓｉ　Ｑ２　０．５ｗｔ％、ＺｒＯ２を化学式表示で０
．０１相当添加した粉体を水を媒体としてボールミル中
にて２４時間混合した。Example 1 Chemical formula: N iO, 'l'l COo, 62F e +
, qgO+, Nip, CO2O3, Fe20
Weigh out a, add 20g of B' 0.5wt%,
Si Q2 0.5wt%, ZrO2 in chemical formula 0
．． The powder to which 0.01 was added was mixed for 24 hours in a ball mill using water as a medium.

該混合粉を大気中にて９５０℃で仮焼の後同じくボール
ミル中で２４時間の湿式粉砕を施した。該粉砕粉をＰＶ
Ａ溶液を用い造粒の後リング状に成形した成形体を大気
中にて１１００℃で３時間の焼成を行なった。この試料
の特性をＺｒＯ２を添加しないものの結果と合せ第１表
に示す。The mixed powder was calcined at 950° C. in the air and then wet-pulverized in a ball mill for 24 hours. The pulverized powder is PV
After granulation using Solution A, the ring-shaped molded body was fired at 1100° C. for 3 hours in the atmosphere. The characteristics of this sample are shown in Table 1 together with the results for the sample without ZrO2 added.

第１表第１表で初透磁率の温度係数は次式で定義した。Table 1In Table 1, the temperature coefficient of initial magnetic permeability is defined by the following formula.

この温度係数は０〜８０℃の間で一様に負であった。This temperature coefficient was uniformly negative between 0 and 80°C.

実施例２化学式でＮ　ｉ　ｏ、！；Ｃ００，０＋！５Ｆ　Ｊ、ｆ
１４　ｏ４　となる採索原料を秤量し、これにＢｌ　２
０３１．５ｗｔ％、　Ｓｉ　ＯＯ，３ｗｔ％、ＺｒＯ２
を化学式相当で０．０３添加した混合物を実施例１と同
一の処理を施し、大気中１０５０℃で焼成したものの特
性を第２表に示す。この温度係数も０〜８０℃で一様な
負の値であった。Example 2 The chemical formula is N io,! ;C00,0+! 5F J, f
14 o4 was weighed, and Bl 2 was added to it.
031.5wt%, SiOO, 3wt%, ZrO2
Table 2 shows the properties of a mixture in which 0.03 of the chemical formula was added, which was subjected to the same treatment as in Example 1 and fired at 1050° C. in the atmosphere. This temperature coefficient was also a uniform negative value from 0 to 80°C.

第２表これら実施例で明らかなごとく、Ｚｒ　０２を添加した
ものは負の温度係数を維持しつつ、密度が向上し製品強
度の改善に効果がある。Table 2 As is clear from these examples, the Zr 02-added product maintains a negative temperature coefficient while improving density and is effective in improving product strength.

本発明の組成について加えておくと、Ｎｉフェライトを
選んだのは高周波での電圧拡大率を太きくするに際し、
高電気抵抗とするためである。従って高電気抵抗でかつ
一様な負の温度係数となる元素、例えばＣｕＯを含有さ
せてもよい。ざらにＣｅ２Ｏは電圧拡大率を一層大きく
するのに効果があるが量が増すに従い、いわゆる第２次
ピークが高温側に大きく移動することがら、伯の成分量
を変えても本発明で規定した０〜８０℃の間で一様な負
の温度係数を実現出来ない。To add to the composition of the present invention, Ni ferrite was chosen to increase the voltage expansion ratio at high frequencies.
This is to provide high electrical resistance. Therefore, an element having high electrical resistance and a uniform negative temperature coefficient, such as CuO, may be contained. In general, Ce2O is effective in further increasing the voltage magnification ratio, but as the amount increases, the so-called secondary peak moves significantly toward the high temperature side. A uniform negative temperature coefficient cannot be achieved between 0 and 80°C.

Ｂｉ２Ｏ３およびＳ！０２量については請求の範囲内で
一様な負の温度係数を得られるものである。ＺｒＯ２量
に関しては、少ないと密度向上の効果がないのはもちろ
んであるが多すぎると異相を生じ易くなり磁気特性が劣
化する。Bi2O3 and S! Regarding the amount of 02, a uniform negative temperature coefficient can be obtained within the claimed range. Regarding the amount of ZrO2, if it is too small, there will be no effect of improving the density, but if it is too large, different phases will easily occur and the magnetic properties will deteriorate.

以上の如く本発明の組成物は密度の高い一様な負の温度
係数材を得ることができる。As described above, the composition of the present invention makes it possible to obtain a uniform negative temperature coefficient material with high density.

Claims (1)

Translated fromJapanese

【特許請求の範囲】[Claims]化学式Ｎｉ×ＣＪ　　Ｆｅｚ　　Ｏａ　　（ただし０．
８＜Ｘ　り１．２．　０，０１１Ｖ　ｆ　（１，０３、
ｉ、ａ、＜ｚ　（＝　２．２でＸ＋Ｖ＋Ｚ＝３）で表わ
される組成に８！２０およびＳ　＋　０２を０．２．＜
Ｂｌ　２０３＜４ｗｔ　％、　　０．２４８　！　０２
　＜　３ｗｔ％、Ｚｒ　０２を上記化学式表示で０．０
０５〜０．０４添加し、焼成してなるフェライトで初透
磁率の濃度係数が０〜８０℃の範囲で一様に負であるこ
を特徴とする高周波磁性材料。Chemical formula Ni×CJ Fez Oa (however, 0.
8<X ri1.2. 0,011V f (1,03,
Adding 8!20 and S + 02 to the composition represented by i, a, <z (= 2.2 and X+V+Z=3) with 0.2. <
Bl 203<4wt%, 0.248! 02
<3wt%, Zr 02 as shown in the above chemical formula: 0.0
1. A high-frequency magnetic material characterized in that the concentration coefficient of initial magnetic permeability is uniformly negative in the range of 0 to 80°C, and is made of ferrite made by adding 0.05 to 0.04 and firing.