JPS59126737A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material with improved wear resistance and contact resistance characteristics by adding a specified amount of at least one among Cr, Mg, Zr and P to an alloy material consisting of specified percentages of Au, Pt, Ag, Cu and Zn to increase the softening temp. CONSTITUTION:To an alloy material consisting of, by weight, 70.5-72.5% Au, 7.5-9.5% Pt, 3.5-5.5% Ag, 13.5-15.5% Cu and 0.5-1.5% Zn is added 0.5- 15wt% at least one among Cr, Mg, Zr and P without changing the ratio in the composition. A brush contact having superior wear resistance, producing little powder owing to wear, and generating hardly any noise is obtd. The brush contact has stable contact 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, as materials for brush contacts, A u 70.5-7
2.5% by weight, Pt7.5-9.5% by weight, Ag3.5
~5.5% by weight, Cu 13.5-15.5% by weight,
Alloy materials containing 0.5 to 1.5 M% of Zn have been widely used.

However, brush contacts made of this alloy material have a low softening temperature, so they tend to adhere when sliding with the commutator, and abrasion powder is likely to be generated, causing instability in contact resistance.

The present invention has been made to eliminate such drawbacks, and uses the above-mentioned alloy material as a base material and adds a specific material to it to increase the softening temperature, thereby improving wear resistance.

The present invention aims to provide a sliding contact material with improved contact resistance characteristics.

The sliding contact material of the present invention has an A u of 70.5 to 72.5
Weight %, Pt 7.5-9.5 weight %, Ag 3.5-5.
5% by weight, Cu 13.5-15.5% by weight, Z
It is made by adding 0.5 to 15% by weight of at least one of Cr, Mg, Zr, and P to an alloy material consisting of 0.5 to 1.5% by weight without changing the composition ratio. be.

In the sliding contact material of the present invention, A u 70.5 to 7
2.5% by weight, Pt7.5-9.5% by weight, Ag3.5
~5.5% by weight, Cu 13.5-15.5% by weight,
An alloy material consisting of ZnO, 5 to 1.5% by weight,
The reason why 0.5 to 15% by weight of at least one of Cr, Mg, Zr, and P is added without changing the composition ratio is to improve the wear resistance and contact resistance stability of the alloy material. This is to raise the softening temperature as much as possible, and if it is less than 0.5% by weight, it will not be able to increase the softening temperature and prevent adhesion, and 1
If it exceeds 5% by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable.

Next, using the sliding contact material according to the present invention and the conventional sliding contact material having the compositions shown in the left column below, each wire diameter was 0.7 t.
Make the brush wire material a, cut it into 8 cranes each, and make 2
These are lined up and one end has a width of IQmm, a length of 13u, and a thickness of 0.
A brush contact was made by welding a 2+n composite material and bending a 2R arc-shaped contact portion 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: 0.6A Voltage: 12■ Load: Resistive load Rotation speed: 1000 rpm Peripheral speed
:130-120 m/min contact crab 100
g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 4 had significantly less wear than the conventional brush contacts, and the contact resistance was low (stable). I understand that.

This is because the sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 4, is made of Cr.

This is because the addition of Mg, Zr, and P prevents adhesion due to softening during sliding and improves wear resistance and stability of contact resistance.

As detailed above, according to the sliding contact material according to the present invention,
It has significantly better wear resistance than conventional sliding contact materials, generates extremely little abrasion powder, generates almost no noise, and has more stable contact resistance than conventional sliding contact materials. This has the effect of providing a brush contact point.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] A u 70.5 to 72.5% by weight, P t 7.5
~9.5% by weight. A g 3.5-5.5% by weight, Cu 13.5-1
5.5% by weight. A sliding material made by adding 0.5 to 15% by weight of at least one of Cr, Mg, Zr, and P to an alloy material consisting of 0.5 to 1.5% by weight of Zn without changing the composition ratio. Contact material.