JPH06338235A - Electric contact material - Google Patents

Abstract

PURPOSE:To enhance adhesive resistance without damaging contact stability of an Au material by including Ag, Pb, Ni and Au. CONSTITUTION:5-30wt.% of Ag, 2-10wt.% of Pb, 0.5-5wt.% of Ni and the residual of Au, or 5-30wt.% of Ag, 3-15wt.% of Pt, 0.5-5wt.% of Ni and the residual of Au are melted, cast, extruded and tape-elongated, thus obtaining an electric contact point material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric contact of a relay or a switch that opens and closes a relatively small current, and more particularly to an electric contact material that suppresses adhesion at the electric contact.

[0002]

2. Description of the Related Art Conventionally, electrical contacts that open and close relatively small currents, such as small relays and small switches, generate less arc when opening and closing, and can be decomposed when oxides, sulfides, etc. are generated on the contact surface. The contact resistance becomes unstable.
Therefore, an Au-Ag 10 wt% alloy mainly composed of expensive Au,
Au-Pd 5wt% alloy was used, but if ultrasonic cleaning is performed at the time of cleaning the board after mounting it on the printed circuit board, a slight sliding force will be applied to the contact point and the contact will become stuck due to sticking. In addition, there is a problem that contact adhesion occurs due to vibration during transportation after assembling the relay and switch.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an electric contact material having excellent adhesion resistance.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the inventor has studied from various angles about an electric contact material having excellent adhesion resistance. As a result, the following components and compositions have been solved.

One of the electrical contact materials of the present invention is Ag5.
It is characterized by being composed of an alloy of 30 wt%, Pd 2 to 10 wt% and Ni 0.5 to 5 wt% balance Au. Furthermore, another one of the electrical contact materials of the present invention is Ag5-30 wt%, Pt.
It is characterized by being composed of an alloy of 3 to 15 wt% and Ni of 0.5 to 5 wt% balance Au.

[0006]

According to the electrical contact material of the present invention constructed as described above, the adhesiveness peculiar to Au-based materials such as Au-Ag alloy and Au-Pd alloy is imparted to Pd or Pt and Ni and Ag.
It is possible to obtain an electric contact material that meets the purpose by effectively suppressing the contact stability of the Au-based material without hindering it by a synergistic effect due to the interaction of the above.

The component composition is preferably as follows. Ag is less than 5 wt%, in which thin the effect of improving the hardness is insufficient anti-stick improvement, is sulfided exceeds 30 wt% Ag ₂ S is produced contact resistance becomes unstable. If the Pd is less than 2 wt% or the Pt is less than 3 wt%, the hardness is insufficiently improved and the effect of improving the adhesion resistance is small.
When Pt exceeds 15 wt% or when Pt exceeds 15 wt%, when fine sliding is applied to the contact portion, the organic gas reacts with Pd or Pt to generate brown powder, and the contact resistance becomes unstable or rises. is there. If the Ni content is less than 0.5 wt%, the hardness is insufficiently improved and the effect of improving the adhesion resistance is small.
%, Abrasion powder will be generated during fine sliding, and at this time Ni
Forms an oxide, and the contact resistance becomes unstable when it intervenes at the contact point.

Further, since the content of Au is smaller than that of the conventional one, cost merit can be obtained. It is needless to say that the electric contact material of the present invention is effective as long as it is provided on at least the outermost surface contact surface, and can be used, for example, as a multilayer composite electric contact material, and its thickness and the like are appropriately designed.

[0009]

EXAMPLES Examples and conventional examples will be described below. As Example 1, Au 66 wt% -Ag 25 wt% -Pd 8 wt% -N
After melting, casting, wire drawing, and tape rolling at a compounding ratio of i1 wt%, and then laminating it to the upper layer of AgPd60 wt%, a crossbar contact with a width of 1.0 mm, a height of 0.6 mm, and a thickness of 0.4 mm was formed. did. Further, as Example 2, Au 82 wt%-
A crossbar contact was made in the same manner as in Example 1 except that the composition ratio was Ag 10 wt% -Pd 4 wt% -Ni 4 wt%.
Furthermore, as Example 3, Au61wt% -Ag25wt% -Pt12wt
% -Ni2 wt%, and as Example 4 Au83 wt% -Ag
A crossbar contact was prepared in the same manner as in Example 1 except that the composition ratio was 8 wt% -Pt 5 wt% -Ni 4 wt%.

Next, a crossbar contact was made in the same manner as in Example 1 except that the composition ratio of AuAg was 10 wt% as the conventional example and Au-Pd was 5 wt% as the conventional example 2. However, the contact evaluation was as follows as a result of the contact test with a combination of facing contacts of the same kind with a contact force of 15 g, a fine sliding distance of 0.2 mm, a frequency of 50 Hz, a time of 5 minutes, and 5 test units each. .

[0011]

[Table 1]

As described below, in the conventional examples 1 and 2, the contact resistance is stable, but the adhesion coefficient is high and there is a concern that it cannot be separated. In the first to fourth examples, the contact resistance is the same. It was stable and had a significantly low adhesion coefficient and was good.

[0013]

As described above, according to the electric contact material of the present invention, the adhesiveness peculiar to the Au-based material is effectively suppressed by Pd, Pt, Ni and Ag, and the contact stability of the Au-based material is improved. Since it can be maintained without hindrance, it has an excellent effect that good contact characteristics and therefore long life characteristics can be obtained.

Claims (2)

[Claims] 1. Ag 5-30 wt%, Pd 2-10 wt%, Ni
An electrical contact material comprising 0.5 to 5 wt% balance Au. 2. Ag 5-30 wt%, Pt 3-15 wt%, Ni
An electrical contact material comprising 0.5 to 5 wt% balance Au.