JPS59118836A - Sliding contact material - Google Patents

Abstract

PURPOSE:To improve the welding resistance and wear resistance of an Au-Pt- Pd-Ag type sliding contact material during sliding by adding specified elements to the contact material. CONSTITUTION:To an alloy consisting of 19-21% Au, 4-6% Pt, 44-46% Pd and 29-31% Ag as a sliding contact material, especially as a brush contact material is added 0.5-10% at least one among W, V and Ta without changing the ratio in the composition. 0.01-0.5% Fe group metal such as Fe, Ni or Co may be added furthermore. By adding at least one among W, V and Ta, the softening temp. is increased, and the welding resistance during sliding is improved. By adding the Fe group metal, the grains are made fine to improve the wear resistance.

Description

[Detailed description of the invention] The present invention relates to improvements in sliding contact materials.

Conventionally, various materials have been used as sliding contact materials, and in particular, materials for brush contacts include Au 19-21% by weight, PT 4-6% by weight, Pd 44-46% by weight, Ag.
Alloy materials consisting of 29-31% by weight have been widely used.

However, brush contacts made of this alloy material have a low softening temperature and tend to adhere when sliding with the commutator, resulting in poor wear resistance, easy generation of abrasion powder, unstable contact resistance, and noise generation. It was the cause.

The present invention has been made to overcome these drawbacks, and provides a sliding material that uses the above-mentioned alloy material as a base material and slightly adds a specific element to raise the softening temperature and improve the adhesion resistance. The purpose is to provide contact materials.

One of the sliding contact materials of the present invention contains Au 19-21% by weight, Pt 4-6% by weight, Pd 44-46% by weight, Ag
Without changing the composition ratio of the alloy material consisting of 29 to 31% by weight, a small amount of W, V, and Ta (all types of 0.5 to 0.5
It is made by adding 10% by weight.

Another member of the sliding contact material of the present invention, A u 19-2
1% by weight, 4-6% by weight of Pt, 44-46% by weight of Pd.

0.5 to 10 weight % of at least one of W, V, and Ta is added to the alloy charge consisting of 29 to 31 weight % of A g without changing the composition ratio, and 0.5 to 10 weight % of at least one of W, V, and Ta is added. It is made by adding 0.01 to 0.5% by weight.

In the sliding contact material of the present invention, an alloy material consisting of Au 19 to 21% by weight, I)t 4 to 6% by weight, Pd 44 to 46% by weight, and Ag 29 to 31% by weight, The reason for adding a small amount of W, V, and Ta (0.5 to 10% by weight of each type) without making any changes is to increase the softening temperature of the alloy material and improve the adhesion resistance. 0
If it is less than 45% by weight, the effect cannot be exhibited, and if it is less than 10% by weight.
If it exceeds this, the amount of oxides generated will increase, the contact resistance will increase, and furthermore, it will become unstable.

Furthermore, in addition to adding 0.5 to 10% by weight of at least one of W, V, and Ta to the alloy material, 0.5 to 10% by weight of Fe group metal is further added.
．． The reason for adding 01 to 0.5% by weight is to refine the crystal grains and further improve wear resistance.
If it is less than 0.5% by weight, the effect of grain refinement will not appear.
If it exceeds this amount, it will precipitate on its own, which will actually impede wear resistance.

Next, using the sliding contact material according to the present invention and the conventional sliding contact material having the composition shown in the left column below, each wire diameter was 0.7+u.
Make a brush wire, cut each into 8 lengths, make double rows, and make one end 10m wide! 1. Length 13 cranes, thickness 0.
A brush contact was made by welding it to the base of two cranes and bending two arc-shaped contact parts at the other end. Then, each brush contact was brought into contact with a disk-shaped commutator, and the commutator was rotated in forward and reverse directions to perform a sliding test under the following test conditions, and the wear amount and contact resistance were measured. The results shown in the column were obtained.

Test conditions Current: 7 0.6A Voltage = 12■ Load: Resistive load Rotation speed: 1000 rpm Peripheral speed
: 130-120 m/min contact crab
100g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 6 had significantly less wear than the conventional brush contacts, and the contact resistance was equally low and stable. It can be seen that This is simply because the sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 6, is prevented from softening during sliding by W, V, and Ta, and its wear resistance is improved. Nothing but. In particular, the reason why the brush contacts of Examples 4 to 6 have much less wear than the brush contacts of Examples 1 to 3 is that Fe group metal is added to the sliding contact material of the present invention constituting the brush wire. This is because the crystal grains have become finer and more dispersed, further improving wear resistance.

As detailed above, according to the sliding contact material according to the present invention,
A brush that has significantly better wear resistance than conventional sliding contact materials, generates extremely little abrasion powder, generates almost no noise, and has contact resistance equivalent to that of conventional sliding contact materials. This has the effect of providing points of contact.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Au19-21% by weight, Pt4-6% by weight, Pd4
A sliding contact material made by adding 0.5 to 10% by weight of at least one of W, V, and Ta to an alloy material consisting of 4 to 46% by weight and 29 to 31% by weight of Ag without changing the composition ratio. . 2) Au 19-21% by weight, Pt 4-6% by weight
, W, V, T without changing the composition ratio to an alloy material consisting of 44-46% by weight of Pd and 29-31% by weight of Ag.
A sliding contact material comprising 0.5 to 10% by weight of at least one of the above and further 0.01 to 0.5% by weight of Fe group metal.