JPS58112211A - Composite electric contact material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention is a composite electrical contact material.

Generally, as an electrical contact material, it is required to have excellent adhesion resistance and abrasion resistance, and to have low and stable contact resistance.

Recently, ceramic clay with a performance of 4iK has been desired for electrical contacts used as relays become smaller and have higher reliability.

For example, in terms of load, there is a relay with a high current and a low constant voltage IlO, and on the other hand, a relay with the same current but a low current 1! I (several μ
There is an increasing demand for relays that can be closed from short to high currents (several tens of micrometers), and there is a desire to develop electrical contacts that can accommodate this.

However, on the other hand, it has not been possible to obtain 11 electrical points that can completely cover a wide range of uses using one type of metal or alloy material.

For this reason, conventionally, the surface layer is A11 or 8U plating or Au alloy, and the intermediate layer is KAg or Ag-Pd type.

Mug-CdO-based and Ag-Ni-based materials are
A composite electrical contact material with a -Ni alloy was used.

For this composite electrical contact material, if the load current is relatively small, the surface layer OAtg or a thick plating or a thin alloy may be sufficient, but when the load current becomes large, the surface layer is consumed and the intermediate layer material is The problem was that the layers eventually became rough and welding occurred.

As I mentioned earlier, due to the miniaturization of relays, the contact force and N separation force of electrical contacts have become smaller, and the spacing between the contacts has become narrower, making the use of electrical contacts extremely harsh. Therefore, electrical contact materials with excellent bath adhesion resistance are required, but the Ag-Cd0-based materials conventionally used as electrical contact materials with good bath adhesion resistance are as described above. It is not a satisfactory material for electrical contacts that are used under severe conditions.

The present invention was made in view of the above circumstances, and the present invention has been made in view of the above circumstances.
The purpose of the present invention is to provide an Australian electrical II point material for obtaining electrical contacts that can be used in a wide range of applications.

The composite electrical contact material of the present invention has a surface layer and a Cu layer.
- What has been achieved with the Ni alloy is what makes it t-mold.

In such a composite electrical contact material of the present invention, the surface layer is A
As for u or Au-plated or five-deaf alloy, Au is chemically stable and s? , 6, - The contact resistance can be kept low and stable, and when the current value ranges from several μA to about 100 mA, mechanical abrasion occurs in large cities, and when the current value exceeds 100 mA, the surface layer is electrically consumed and the intermediate layer surface layer , the material has excellent welding resistance, and no welding occurs even under low contact force, lI separation force, and narrow distance between contacts, and 8El is suitable for contact materials used in miniaturizing relays before oxidation. 2-15 weight-
It is suitable for manufacturing and performance that 1In contains 1 to 7 parts by weight.

Next, in order to clarify the effects of the composite electrical contact material according to the present invention, specific examples and conventional examples will be described.

[Example 1]

rai layer 1 (Au-MglO weight-1, AAg-8no containing Si 7.5 weight before oxidation in the middle layer, Cu in the lower layer)
Composite electrical contact material with -Ni2O weight-, upper width L
85■, bottom @2. Om, surface layer thickness 5 μm.

A tape with an intermediate layer thickness of 300 μm and a total thickness of CLS2 was prepared, cut into a length of 1.85 m, and incorporated into a suiyf. Since the bonding between AAg-8no and C5i-Ni 30 weight 2 pieces was unstable, an Ag layer was inserted between the two for bonding.

[Example 2] 5El8 before surface layer K Au plating and intermediate layer KWI
Composite electrical contact material with a weight of 9g, above @ L85,
Lower width Z Om, surface layer thickness 5 μm, intermediate layer thickness 3
00μm, total thickness 0-52wm tape was made, lc
An Ag layer was added and bonding was performed.

[Conventional Example 1] Surface layer KAu-Lg 1.0 weight - 1 Intermediate layer KAg-Ni
A composite electrical contact material with a lower layer KCu-Ni3Q weight of 15% by weight, an upper width of 1.85 m and a lower width of 2.0 m.
m, surface layer thickness 5 μm, intermediate layer thickness 300 μm, I! Make a tape with a thickness of 0.52■ and make it L85■
I cut it off for the length of time and put it on the switch.

[Conventional Example 2] Composite electrical contact material with surface layer K Au plating, intermediate layer KAg-CdO 12 weight - 1 lower layer KCu-Ni 3 g weight, upper width 1.85 m, lower width λOM.

The thickness of the surface layer is 5 μm, and the thickness of the intermediate layer is 300 μm.

Create a tape with a total jl of 0.52 M and convert it to 1.8
I cut it to 5cm length and assembled it into the switch.

However, two switches of each of Examples 1 and 2 and Conventional Examples 1 and 2 were subjected to opening/closing tests under the test conditions shown in the left column of the table below, and the welding resistance and contact resistance were investigated. The results shown in the right column were obtained.However, the number of opening and closing cycles was limited to 50,000 times, and if a bathing problem occurred during the test, the test was stopped at that point.

As is clear from the table above, the switch of the example has excellent bath adhesion resistance in a high current range under the same conditions as compared to the conventional switch, has a low and stable II contact resistance, and has a low current range. It can be seen that they have approximately the same welding resistance and contact resistance.

Ge, Bi, Zr, Fe, Co, NI () At least one kind of acid may be added with a total of 0.01-0.5% by weight of at least one of Fe, Co, and Ni before oxidation. be.

By doing so, the welding resistance in a high current range can be further improved and the contact resistance can be further lowered and stabilized.

The composite electrical contact material according to the present invention described in detail above can be widely used, covering a wide range from a low current of several μA to a high current of several 1OA, and has better bath adhesion resistance than conventional composite electrical contact materials. The contact resistance is the same in the low current range, and is slightly lower and stable in the high current range, making it an innovative composite electrical 11-point material that can replace conventional composite electrical contact materials. I can say it.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. 55

Claims (1)

[Claims] A composite electrical contact material characterized by: