JPS605846A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having superior wear resistance by adding specified elements to an Au-Pt-Pd-Ag alloy without changing the ratio in the composition. CONSTITUTION:To an alloy material for a sliding contact having a composition consisting of, by weight, 19-21% Au, 4-6% Pt, 44-46% Pd and 29-31% Ag added 1-10wt.% Sn and 0.5-3wt% at least one among Si, Bi, Ge and Ga without changing the ratio in the composition. By adding the elements, the hardness of the alloy is increased, so the resistance of the alloy to wear during sliding along a commutator is improved. When 0.01-0.5wt% Fe group metal such as Ni is substituted for part of Sn, the grains of the alloy are made fine to further 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.
Alloys consisting of 29-31% by weight were widely used.

However, brush contacts made of this alloy material have poor abrasion resistance when sliding with the commutator, and are likely to generate abrasion powder, causing noise.

The present invention has been made in order to eliminate such drawbacks, and provides a sliding contact material that uses the above-mentioned alloy material as a base material and has improved wear resistance by adding a small amount of a specific element to the alloy material. That is.

The sliding contact material of the present invention has an Au of 19 to 21% by weight.

P't4-6% by weight, Pd44-46% by weight, Ag2!
Without changing the composition ratio of the alloy material consisting of 11 to 31% by weight, 1 to 10ffi amount of Sn and Si, 13i
, Ge.

At least one type of Ga is added in an amount of 0.5 to 3% by weight.

In the sliding contact material of the present invention, Au 19-21% by weight, Pt 4-6% by weight, Pd 44-46% by weight, Ag
1 to 10% by weight of Sn, St, and Bi without changing the composition ratio to an alloy material consisting of 29 to 31% by weight.

The reason why 0.5 to 3% by weight of at least one of Ge and Ga is added is to make the alloy material hard to improve its wear resistance. B
If at least one of i, Ge, and Ga is less than 0.5% by weight, the effect cannot be exhibited, and if Sn is more than 10% by weight, Si, Bi, and Ge.

If at least one type of Ga exceeds 3% by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable.

Further, a part of the Sn is replaced with 0.01 to 0.5% by weight of F.
The reason for replacing it with group e metal is to refine the crystal grains and further improve wear resistance.If it is less than 0.01% by weight, the effect of grain refinement will not appear, so if it is less than 0.5% by weight, Even if you exceed it, no further effect can be obtained.

Next, we used a non-exploded sliding contact material with the composition shown in the left column below and a conventional sliding contact material, each with a wire diameter of 0.7 m.
m brush wires were made, each cut into lengths of 8 mm,
Two wires are placed in parallel and -θiff are welded to a base material of width 1 (hm, N 13 mm, thickness 0.2 μm), and a 2R circle 4Ii is attached to the other end.
A brush contact was made by bending the shaped contact part. 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: 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000rpm Peripheral speed: 13o~120m'/min Contact crab
100g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 5 had significantly less wear than the conventional brush contacts, and the contact resistance was equally low and stable. I know that there is. This alone makes the sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 5, harden and have wear resistance due to the addition of Sn and at least one of Si, Bi, Ge, and Ga. It's all about improving. In particular, the reason why the amount of wear of the brush contact of Example 5 is even smaller than that of the brush contacts of Examples 1 to 4 is that Fe group metal is added to the sliding contact material of the present invention that constitutes 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 with significantly superior wear resistance compared to conventional il sliding contact materials, generates extremely little abrasion powder, causes almost no noise, and has contact resistance equivalent to that of conventional sliding contact materials. This has the advantage that there are 14 contact points.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Au19-21% by weight, pt4-a weight%, Pd4
4 to 46% by weight of Sn and 0.5% of at least one of Si, Bi, Ge, and Ga to an alloy material consisting of 4 to 46% by weight and 29 to 31% by weight of Ag, without changing the composition ratio.
A sliding contact material containing ~3% by weight. 2) Part of the Sn is 0.01 to 0.5% by weight of Fe
The sliding contact material according to claim 1, characterized in that the sliding contact material is replaced with a group metal.