JPH0235019B2

JPH0235019B2 -

Info

Publication number: JPH0235019B2
Application number: JP58087948A
Authority: JP
Inventors: Takeshi Harada
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1983-05-19
Filing date: 1983-05-19
Publication date: 1990-08-08
Also published as: JPS59215442A

Description

[Detailed description of the invention]

本発明は、電気接点材料に係り、特にAg−
CdOより成る電気接点材料の改良に関する。 Ag−CdOより成る電気接点材料は、継電器の
接触力、開離力の大きい場合、耐溶着性に優れ、
接触抵抗が安定している為、広く多用されてい
る。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、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、Ag−CdO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。本発明は電気接点材料の１つは、Cd10〜20重
量％、Te1〜５重量％、Cu0.5〜５重量％、Bi0.1
〜３重量％、残部Agより成り、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１つは、Cd10〜
20重量％、Te1〜５重量％、Cu0.5〜５重量％、
Bi0.1〜３重量％、Fe族元素0.01〜0.5重量％、残
部Agより成り、且つ内部酸化されているもので
ある。これら本発明の電気接点材料に於いて、その成
分組成を上記の如く限定した理由について説明す
ると、Cdは周知の如く優れた耐溶着性と安定し
た接触抵抗を保持するのに必要で、10重量％未満
では良好な耐溶着性が得られず、20重量％を超え
ると耐消耗性が向上させる元素が添加されていて
も耐消耗性が劣化するので、10〜20重量％が好適
である。Cuは内部酸化時に析出する酸化物を微
細化し、電気伝導度を上げ耐消耗性を向上するの
に必要で、0.5重量％未満ではTe、Biの添加によ
る耐消耗性の劣化を抑えきれず、５重量％を超え
ると耐溶着性が劣化するので、0.5〜５重量％が
好適である。Teはその酸化物が接点開閉時に昇
華しやすく耐溶着性の向上に必要で、１重量％未
満ではその効果がなく、５重量％を超えると耐消
耗性が劣化するので、１〜５重量％が好適であ
る。Biはその酸化物が脆く、解離しやすいため
接触力、開離力の小さい場合の耐溶着性の向上に
必要で、0.1重量％未満ではその効果が無く、３
重量％を超えると合金の融点を極端に低下させ、
高温での内部酸化が不可能となるので、0.1〜３
重量％が好適である。Fe族元素は耐アーク性、
耐消耗性を向上させる為に添加するもので、0.01
重量％未満ではその効果が無く、0.5重量％を超
えると接触抵抗が高く不安定となるので、0.01〜
0.5重量％が好適である。次に本発明による電気接点材料と従来の電気接
点材料にて作つた電気接点について説明する。下記の表の左欄に示す成分組成の粉粒体を内部
酸化した後、圧縮、焼結、押出、引抜等の工程を
経て得た実施例１〜７の電気接点材料と従来例
１、２の電気接点材料にて作つた直径５mm、厚さ
１mmの固定接点と直径４mm、厚さ1.1mm、5Rの可
動接点を対向させて、下記の試験条件にて接点開
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：溶着発生迄接触力：40ｇ開離力：45ｇ The present invention relates to electrical contact materials, particularly Ag-
Concerning improvements in electrical contact materials made of CdO. Electrical contact materials made of Ag-CdO have excellent welding resistance when the contact force and breaking force of relays are large.
It is widely used because of its stable contact resistance. Recently, as relays have become smaller, contact force and separation force have decreased, contacts have become smaller, and contact gaps have become narrower, resulting in problems with welding resistance. For this reason, there is a demand for electrical contact materials with excellent welding resistance. The present invention has been made as a result of intensive research aimed at meeting such needs, and has resulted in the discovery of an electrical contact material that retains the stable contact resistance of electrical contact materials made of Ag-CdO and has significantly improved welding resistance. . One of the electrical contact materials of the present invention is Cd 10-20% by weight, Te 1-5% by weight, Cu 0.5-5% by weight, Bi 0.1
~3% by weight, the balance being Ag, and is internally oxidized. Another electrical contact material of the present invention is Cd10~
20% by weight, Te1-5% by weight, Cu0.5-5% by weight,
It consists of 0.1 to 3% by weight of Bi, 0.01 to 0.5% by weight of Fe group elements, and the balance is Ag, and is internally oxidized. The reason why the component composition of the electrical contact materials of the present invention is limited as described above is as follows.As is well known, Cd is necessary to maintain excellent welding resistance and stable contact resistance. If it is less than 20% by weight, good welding resistance cannot be obtained, and if it exceeds 20% by weight, the abrasion resistance deteriorates even if an element that improves the abrasion resistance is added. Therefore, 10 to 20% by weight is suitable. Cu is necessary to refine the oxides precipitated during internal oxidation, increase electrical conductivity, and improve wear resistance. If it is less than 0.5% by weight, the deterioration of wear resistance due to the addition of Te and Bi cannot be suppressed. If it exceeds 5% by weight, the welding resistance deteriorates, so 0.5 to 5% by weight is suitable. Te is necessary for improving welding resistance because its oxide tends to sublimate when opening and closing contacts, and if it is less than 1% by weight, it has no effect, and if it exceeds 5% by weight, wear resistance deteriorates, so 1 to 5% by weight is suitable. Bi is necessary to improve welding resistance when the contact force and separation force are small because its oxide is brittle and dissociates easily, and if it is less than 0.1% by weight, it has no effect;
Exceeding % by weight will drastically lower the melting point of the alloy,
0.1 to 3 as internal oxidation becomes impossible at high temperatures.
% by weight is preferred. Fe group elements have arc resistance,
Added to improve wear resistance, 0.01
If it is less than 0.01% by weight, there is no effect, and if it exceeds 0.5% by weight, the contact resistance will be high and unstable.
0.5% by weight is preferred. Next, electrical contacts made using the electrical contact material according to the present invention and the conventional electrical contact material will be explained. Electrical contact materials of Examples 1 to 7 and Conventional Examples 1 and 2 obtained by internally oxidizing powder and granules having the composition shown in the left column of the table below, and then undergoing processes such as compression, sintering, extrusion, and drawing. A contact opening/closing test was conducted under the following test conditions using a fixed contact with a diameter of 5 mm and a thickness of 1 mm made of electrical contact material of The results shown in the right column of the table were obtained. Test conditions Voltage: AC100V 50Hz Current: 40A, steady 10A Load: Resistance Switching frequency: 20 times/min Number of switching: Contact force until welding occurs: 40g Breaking force: 45g

【表】上記の表の右欄に示す数値で明らかなように実
施例１〜７の電気接点材料より成る電気接点は、
従来例１、２の電気接点材料より成る電気接点に
比し、溶着発生迄の開閉回数が多く耐溶着性に優
れ、また接触抵抗も同等に低く且つばらつきが少
なくて安定していることが判る。そしてアーク消
耗量については、実施例１〜７の電気接点材料よ
り成る電気接点は、従来例１、２の電気接点材料
より成る電気接点と同等若しくはそれ以下である
ことが判る。以上の説明で判るように本発明の電気接点材料
は、従来のAg−CdO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いるので、従来のAg−
CdOより成る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] As is clear from the values shown in the right column of the table above, the electrical contacts made of the electrical contact materials of Examples 1 to 7 are as follows:
Compared to the electrical contacts made of the electrical contact materials of Conventional Examples 1 and 2, it can be seen that the number of openings and closings before welding occurs is greater, and the welding resistance is excellent, and the contact resistance is equally low and stable with less variation. . As for the amount of arc consumption, it can be seen that the electrical contacts made of the electrical contact materials of Examples 1 to 7 are equal to or less than the electrical contacts made of the electrical contact materials of Conventional Examples 1 and 2. As can be seen from the above explanation, the electrical contact material of the present invention has a stable contact resistance equivalent to that of the conventional electrical contact material made of Ag-CdO, and has significantly improved welding resistance. , conventional Ag−
It can be said to be an epoch-making product that can replace electrical contact materials made of CdO.

Claims

[Claims] 1 Cd 10-20% by weight, Te 1-5% by weight, Cu 0.5-20% by weight
Consists of 5% by weight, 0.1 to 3% by weight Bi, and the balance Ag.
and electrical contact materials that are internally oxidized. 2 Cd10~20wt%, Te1~5wt%, Cu0.5~
5% by weight, Bi0.1-3% by weight, Fe group elements 0.01-0.5
Electrical contact material consisting of % by weight, balance Ag, and internally oxidized.