JPH0335367B2

JPH0335367B2 -

Info

Publication number: JPH0335367B2
Application number: JP59099766A
Authority: JP
Inventors: Takeshi Harada
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1984-05-18
Filing date: 1984-05-18
Publication date: 1991-05-28
Also published as: JPS60245742A

Description

[Detailed description of the invention]

（産業上の利用分野）本発明は、電気接点材料に関するものである。（従来技術及びその問題点）従来より内部酸化法により製作した電気接点材
料の一つとして銀−酸化ビスマスが用いられてき
た。銀−酸化ビスマスは、耐アーク性、耐溶着特
性に優れ安定した接触抵抗等の接点性能を有する
が、昨今、継電器の小型化に伴い接触力、開離力
の低下、接点の小型化、接点ギヤツプの狭小化に
伴い耐溶着性に問題が生じてきた。この為、さら
に耐溶着性に優れた電気接点材が要望されてい
る。本発明は斯かる要望を満たすべく鋭意攻究の結
果、銀−酸化ビスマスより成る電気接点材料の安
定した接触抵抗をそのまま具有し、耐溶着性が大
幅に向上した電気接点材料を見い出したものであ
る。（問題点を解決するための手段）本発明の電気接点材料の一つは、ビスマス13〜
20重量％と、カドミウム0.1〜５重量％、錫0.5〜
５重量％、インジウム0.5〜５重量％と、残部銀
から成る材料であつて、且つ内部酸化されている
ものである。本発明の電気接点材料の他の一つは、ビスマス
13〜20重量％と、カドミウム0.1〜５重量％、錫
0.5〜５重量％、インジウム0.5〜５重量％と、鉄
族元素0.01〜１重量％と、残部銀から成る材料で
あつて、且つ内部酸化されているものである。（作用）本発明の電気接点材料に於いて、ビスマス13〜
20重量％、カドミウム0.1〜５重量％、錫0.5〜５
重量％、インジウム0.5〜５重量％とした理由は、
ビスマス、カドミウムは低温昇華性により耐溶着
性を向上させるためで、ビスマス13重量％未満、
カドミウム0.1重量％未満ではその効果がなく、
またビスマス20重量％を超えると、合金の融点が
下がりすぎて高温での内部酸化が困難となり、カ
ドミウム５重量％を超えると逆に銀−酸化ビスマ
スの耐溶着性を劣化させる。錫はカドミウムの球
状析出を針状にかえ耐溶着性を向上させるため
で、0.5重量％以下ではその効果がなく、５重量
％を超えると接点開閉時に酸化物が接点表面に堆
積し接触抵抗、温度上昇が大になる。インジウム
は酸化物が熱的に安定していることにより、耐溶
着性を向上させるためで、0.5重量％未満ではそ
の効果がなく、５重量％を超えると錫と同様に接
触抵抗、温度上昇が大になる。以上の事よりビス
マス13〜20重量％、カドミウム0.1〜５重量％、
錫0.5〜５重量％、インジウム0.5〜５重量％の範
囲内では、耐溶着特性の充分満足できる電気接点
材料が得られるもである。さらに本発明の電気接点材料の他の一つに於い
て、ビスマス13〜20重量％、カドミウム0.1〜５
重量％、錫0.5〜５重量％、インジウム0.5〜５重
量％以外に鉄族元素0.01〜１重量％添加する理由
は、これを電気接点材料に分散させた場合、これ
により得られる酸化ビスマス及び酸化カドミウム
の均一微細な分散によつて、放電による消耗が均
一化するため接触抵抗がより安定するからであつ
て、0.01重量％未満では酸化ビスマス及び酸化カ
ドミウムが均一微細に分散せず、１重量％を超え
るとそれ自体の偏析が増加し、接触抵抗が不安定
となる。次に本発明による電気接点材料の効果を明瞭な
らしめる為に、具体的な実施例と従来例について
説明する。（実施例）下記の表に左欄に示す実施例１、２の成分組成
の材料を溶解し、アトマイズ粉となした後、600
℃、９気圧、２日間内部酸化し、その酸化アトマ
イズ粉を圧縮焼結し、これを押出、引抜加工した
後切断してヘツダー加工し、頭部径５mm、頭高
1.0mm、脚部径2.5mm、脚長2.5mmの固定接点と頭部
径４mm、頭高1.1mm、脚部径2.8mm、脚長1.6mm、頭
高球状5Rの可動接点を得た。また下記の表の左欄に示す実施例３、４の成分
組成の材料を溶解し、チツプ形状となした後、
600℃、９気圧、２日間内部酸化した後圧縮焼結
し、これを押出、引抜加工した後切断してヘツダ
ー加工し、頭部径５mm、頭高1.0mm、脚部径2.5
mm、脚長2.5mmの固定接点と頭部径４mm、頭高1.1
mm、脚部径2.8mm、脚長1.6mm、頭部球状5Rの可動
接点を得た。然してこれら実施例１〜４の電気接点材料にて
作つたリベツト型電気接点と、下記の表の左欄に
示す従来例の成分組成の材料を実施例１、２と同
じ方法で作つた同一寸法のリベツト型電気接点を
ヒンジ型リレーに組み込み下記の試験条件にて開
閉試験を行つた処、下記の表の右欄に示すような
結果を得た。試験条件電圧：AC100V 50Hz 電流：投入40A、定常10A 負荷：抵抗開閉頻度：20回／分開閉回数：溶着発生迄 (Industrial Application Field) The present invention relates to electrical contact materials. (Prior Art and its Problems) Silver-bismuth oxide has conventionally been used as one of the electrical contact materials manufactured by internal oxidation method. Silver-bismuth oxide has contact performance such as excellent arc resistance and welding resistance, and stable contact resistance. With the narrowing of the gap, problems have arisen in welding resistance. For this reason, there is a demand for electrical contact materials with even better welding resistance. As a result of intensive research to meet these demands, the present invention has discovered an electrical contact material that retains the stable contact resistance of the electrical contact material made of silver-bismuth oxide and has significantly improved welding resistance. be. (Means for Solving the Problems) One of the electrical contact materials of the present invention is bismuth 13~
20% by weight, cadmium 0.1~5% by weight, tin 0.5~
5% by weight of indium, 0.5-5% by weight of indium, and the balance of silver, and is internally oxidized. Another electrical contact material of the present invention is bismuth
13-20% by weight, cadmium 0.1-5% by weight, tin
The material is composed of 0.5 to 5% by weight of indium, 0.5 to 5% by weight of indium, 0.01 to 1% by weight of iron group elements, and the balance silver, and is internally oxidized. (Function) In the electrical contact material of the present invention, bismuth 13~
20% by weight, cadmium 0.1-5% by weight, tin 0.5-5%
The reason for setting indium to 0.5 to 5% by weight is as follows.
Bismuth and cadmium are used to improve welding resistance through low-temperature sublimation, and bismuth is less than 13% by weight.
Cadmium less than 0.1% by weight has no effect;
Moreover, when bismuth exceeds 20% by weight, the melting point of the alloy decreases too much, making internal oxidation at high temperatures difficult, and when cadmium exceeds 5% by weight, the welding resistance of silver-bismuth oxide deteriorates. The purpose of tin is to change the spherical precipitation of cadmium into a needle shape and improve welding resistance. If it is less than 0.5% by weight, it has no effect, and if it exceeds 5% by weight, oxides will accumulate on the contact surface when the contact is opened and closed, resulting in contact resistance and The temperature rise becomes large. Indium improves welding resistance due to its thermally stable oxide; if it is less than 0.5% by weight, it has no effect, and if it exceeds 5% by weight, it will cause contact resistance and temperature rise similar to tin. Become big. From the above, bismuth 13-20% by weight, cadmium 0.1-5% by weight,
Within the range of 0.5 to 5% by weight of tin and 0.5 to 5% by weight of indium, an electrical contact material with sufficiently satisfactory welding resistance can be obtained. Furthermore, in another one of the electrical contact materials of the present invention, bismuth is 13 to 20% by weight, cadmium is 0.1 to 5% by weight.
The reason why iron group elements are added in an amount of 0.01 to 1% by weight in addition to 0.5 to 5% by weight of tin and 0.5 to 5% by weight of indium is that when dispersed in electrical contact materials, bismuth oxide and oxidized Uniform and fine dispersion of cadmium equalizes consumption due to discharge, making the contact resistance more stable. If it is less than 0.01% by weight, bismuth oxide and cadmium oxide will not be uniformly and finely dispersed, and 1% by weight If it exceeds 100%, its own segregation will increase and the contact resistance will become unstable. Next, in order to clarify the effects of the electrical contact material according to the present invention, specific examples and conventional examples will be described. (Example) After melting the materials having the compositions of Examples 1 and 2 shown in the left column of the table below and making them into atomized powder, 600
℃, 9 atmospheres for 2 days, the oxidized atomized powder was compressed and sintered, extruded and drawn, then cut and processed into headers, with a head diameter of 5 mm and a head height.
We obtained a fixed contact with a diameter of 1.0 mm, a leg diameter of 2.5 mm, and a leg length of 2.5 mm, and a movable contact with a head diameter of 4 mm, a head height of 1.1 mm, a leg diameter of 2.8 mm, a leg length of 1.6 mm, and a spherical 5R head height. In addition, after melting the materials having the compositions of Examples 3 and 4 shown in the left column of the table below and forming them into a chip shape,
After being internally oxidized at 600℃ and 9 atm for 2 days, it was compressed and sintered, then extruded and drawn, then cut and processed into headers.The head diameter was 5 mm, the head height was 1.0 mm, and the leg diameter was 2.5 mm.
mm, fixed contact with leg length 2.5mm and head diameter 4mm, head height 1.1
A movable contact with a leg diameter of 2.8 mm, a leg length of 1.6 mm, and a spherical head shape of 5R was obtained. However, the rivet-type electrical contacts made using the electrical contact materials of Examples 1 to 4 and the same dimensions made using the materials of the conventional examples shown in the left column of the table below in the same manner as Examples 1 and 2 When the rivet-type electrical contact was assembled into a hinge-type relay and an opening/closing test was conducted under the test conditions below, the results shown in the right column of the table below were obtained. Test conditions Voltage: AC100V 50Hz Current: 40A, steady 10A Load: Resistance Switching frequency: 20 times/min Number of switching: Until welding occurs

【表】（発明の効果）上記の表で明らかなように実施例１〜４の電気
接点材料で作つたリベツト型電気接点は、従来例
の電気接点材料で作つたリベツト型電気接点に比
し、溶着発生までの開閉回数が多く耐溶着性にす
ぐれ接触抵抗も同等に低く且つばらつきが少く安
定していることがわかる。以上詳記した通り本発
明の電気接点材料は従来の銀−ビスマスより成る
電気接点材料と同等の安定した接触抵抗を有し、
その上耐溶着性については格段に向上しており、
従来の電気接点材料にとつて代わることのできる
画期的なものと云える。[Table] (Effects of the invention) As is clear from the table above, the rivet-type electrical contacts made with the electrical contact materials of Examples 1 to 4 are superior to the rivet-type electrical contacts made with the conventional electrical contact materials. It can be seen that the number of openings and closings before welding occurs is high, the welding resistance is excellent, and the contact resistance is equally low and stable with little variation. As detailed above, the electrical contact material of the present invention has a stable contact resistance equivalent to that of the conventional electrical contact material made of silver-bismuth,
Furthermore, welding resistance has been significantly improved.
It can be said to be an epoch-making product that can replace conventional electrical contact materials.

Claims

[Claims] 1. 13 to 20% by weight of bismuth and 0.1 to 0.1% of cadmium.
5% by weight, tin 0.5-5% by weight, indium 0.5-5%
% by weight, the balance being silver, and which is internally oxidized. 2 Bismuth 13~20% by weight and cadmium 0.1~
5% by weight, tin 0.5-5% by weight, indium 0.5-5%
% by weight, 0.01 to 1% by weight of an iron group element, and the balance is silver, and is internally oxidized.