JPS5956545A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having improved wear resistance by adding Nb, In, Ba or Cd to a sliding contact material having a specified composition consisting of Au, Ag and Cu and by using produced oxide as a lubricant. CONSTITUTION:This sliding contact material is obtd. by adding 0.5-15wt% one or more among Nb, In, Ba and Cd to an alloy material consisting of, by weight, 61.5-63.5% Au, 6.5-8.5% Ag and 29-31% Cu without changing the ratio in the composition or by further adding 0.01-1wt% Fe group metal. The contact material is much superior to a conventional sliding contact material in wear resistance, is equal to it in contact resistance, and generates little noise.

Description

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

Conventionally, nine types of materials have been used as sliding contact materials, and in particular, as materials for brush contacts, A u 61.5-
63. An alloy material consisting of 5ff (Q%, AB!i. 5-8.5% by weight, Cu 29-31% by weight) was widely used.

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

The present invention has been made to eliminate such drawbacks,
The present invention aims to provide a sliding contact material with improved wear resistance by adding a small amount of a specific material to the alloy material as a base material and using the generated oxide as a lubricant.

One of the sliding contact materials of the present invention is 8++61.5-63
．． 5wt%, 8g6.5~[1.5wt%, Cu2Q~
It is made by adding 0.5 to 15% by weight of at least one of Nb, In, Ba, and C (1(7)) to an alloy material consisting of 31% by weight without changing the composition ratio.

Another sliding contact material of the present invention is AII (i1.
5-63.5 Weight 9418g 6.5-B. 5jn bar%.
To an alloy material consisting of 29 to 31% by weight of Cu, 0.5 to 15% by weight of at least one of Nb, In, r3a, and Cd is added without changing the composition ratio, and further Fe group metal (1. 0.01 to 1 mm%.

In the sliding contact material of the present invention, uGI. 5-63,5
tj(G:4 9fi.A r+ 6.5~8.5
Heavy FR%. C +129 to 31% by weight of a synthetic material without changing the composition ratio
The reason for adding 15% by weight of at least one type of la, (.;
．． If it is less than 5% by weight, the amount of oxide generated will be small and it will not be effective as a lubricant, and if it exceeds 15% by weight, the amount of oxide generated will increase, resulting in high contact resistance and instability. It is something.

Further, the alloy material may include Nr>. in. +3a, C (added 0.5 to 151% of at least one of 1) (
、． The reason why 0.01 to 1% by weight of the Fa L'4 metal layer is added is to refine the crystal grains and further improve the wear resistance.If it is less than 0.01% by weight, the effect of grain refinement is If the amount exceeds 1% by weight, it will interfere with the oxide that acts as a lubricant.

Next, using the sliding contact material according to the present invention and the conventional sliding contact material having the component compositions shown in the left column below, brush wires with a wire diameter of 0.7 and a length of 8 mm were each made. Cut into 2
Arrange the trees side by side and make one end width 10mm, length 13**, J'7
Brush contacts were made by welding to a 0.2-l1 base material and bending a 2R arc-shaped contact part on the other end, and each brush contact was brought into contact with a disc-shaped rectifier to form a commutator. A sliding test was performed under the following test conditions by rotating forward and backward, and the wear amount and contact resistance were measured, and the results shown in the right threshold of the table below were obtained.

Test condition current: 0.68? ′! T river = 12 ■ h load: 11 (anti-load rotation speed: + (100rprn circumferential speed = 130 ~ 120ffl/IIIin contact pressure: 10
(lF?) As is clear from the above table, 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. This is simply due to the fact that the sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 5, is Nb, In.13a, C during sliding.
This is because acetate of FeCo, Ni, etc. is generated, and this oxide acts as a lubricant, improving wear resistance. Moreover, since the oxide is soft, it is easily removed by the sliding action, so the contact resistance remains unchanged. In particular, the reason why the amount of wear of the brush contact of Example 1.2 is even smaller than that of the brush contacts of Examples 3 to 5 is that Fe group metal is added to the sliding contact material of the present invention, which constitutes the brush wire. This is because the particles are finely dispersed and the wear resistance is further improved.

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.

Claims (1)

[Claims] 1) A++GI. 5~(i3.5tnrl1%.Ag(
i. 5 to 8.5% by weight and 31% by weight to Cu29, NblI was added without changing the composition ratio.
n. 13a,0 (Sliding contact material made by adding 05 to 15% by weight of at least one type of 1. 2) To △劃+61.5・(G1.5 River leaf%.8g6.5
~8.5 weight 9i'i. CIJ2! 1 to 31% by weight, without changing the composition ratio.
, In+3aCd is added in an amount of 0.5 to 15% by weight, and an Fe group metal is added in an amount of 0.5 to 15% by weight.