JPS6026627A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material of superior wear resistance by adding specified amounts of Mn and one or more among Si, Bi and Ge to a Pd-Ag alloy having a specified composition without changing the proportion in the composition. CONSTITUTION:A sliding contact material is obtd. by adding 1-10wt% Mn and 0.1-3wt% one or more among Si, Bi and Ge to a Pd-Ag alloy material consisting of 30-70wt% Pd and 30-70wt% Ag without changing the proportion in the composition. An Fe group metal such as Ni may be substituted for 0.01-0.5wt% of the Mn.

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, alloy materials consisting of 30 to 70% by weight of P d and 30 to 70% by weight of Ag have been widely used as materials for brush contacts.

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 to eliminate such drawbacks, and provides a sliding contact material with improved wear resistance by using the above-mentioned alloy material as a base material and adding a small amount of a specific material thereto. That is.

The sliding contact material of the present invention has a Pd of 30 to 70% by weight.

An alloy material consisting of 30 to 70% by weight of Ag is mixed with 1 to 10% by weight of Mn and Si without changing its composition ratio.

It is made by adding 0.1 to 3% by weight of at least one of Bi and Ge.

In the sliding contact material of the present invention, I) d 30-70
% by weight of Mn and 30 to 70% by weight of Ag without changing the composition ratio.
The reason for adding 0.1 to 3% by weight of at least one of i, Bi, and Ge is to make the alloy material hard to improve its wear resistance.
If at least one type of Ge is less than 0.1% by weight, the effect cannot be exhibited, and if Mn is 10% by weight or Si, Bi,
If at least one type of Ge exceeds 3% by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable.

In addition, the reason why a part of the Mn is replaced with Fe group metal in the range of 0.01 to 0.5% by weight is to refine the crystal grains and further improve wear resistance. This is because if it is less than 0.5% by weight, no effect of grain refinement will be obtained, and if it exceeds 0.5% by weight, no further effect will be obtained.

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 g.
Brush wire rods were made, each cut into a length of 81 am,
Two fins are placed in parallel and one end has a width of 10 fins, a length of 13 fins, and a thickness of 0.
A brush contact was made by welding to a composite material of two cranes and bending a 2R arc-shaped contact part 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: 12V Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 130-120m/min Contact crab 10
0g 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 equally low and stable. I know that there is. 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 4, has a low content of Mn, Si, Bi, and Ge.
This is because adding one type of both makes it harder and improves wear resistance. In particular, the reason why the amount of wear of the brush contact of Example 4 is even smaller than that of the brush contacts of Examples 1 to 3 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 are finer and the wear resistance is further improved.

As detailed above, according to the sliding contact material according to the present invention,
It has significantly superior wear resistance compared to 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 a brush contact point.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Pd 30-70% by weight, Ag 30-70% by weight
Mn is added to the alloy material consisting of Mn without changing the composition ratio.
A sliding contact material comprising 1 to 10% by weight of Si, Bi, and Ge and 0.1 to 3% by weight of at least one of Si, Bi, and Ge. 2) The sliding contact material according to claim 1, wherein a part of the Mn is replaced by Fe group metal in a range of o, oi to 0.5% by weight.