JPS59229439A - Sliding contact material - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a conventional sliding contact material consisting of Pd and Ru by adding specified amounts of Mn and one or more among Si, Bi and Ge to the contact material. CONSTITUTION:An alloy material having a composition consisting of, by weight, 87-93% Pd and 7-13% Ru has been widely used up to now as a sliding contact material, especially as a material for a brush contact. A brush contact of the alloy material shows, however, inferior wear resistance during sliding along a commutator and causes the generation of noise. In order to improve the wear resistance, 1-10% Mn and 0.5-3% one or more among Si, Bi and Ge are added to the alloy material without changing the ratio in the composition. 0.01-0.5% Fe group metal may be further added.

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 87 to 93% by weight of P d and 7 to 13% by weight of Ru have been widely used as materials for brush contacts.

However, the brush contacts (1) made of this alloy material had poor abrasion resistance when sliding with the commutator, and were prone 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.

One of the sliding contact materials of the present invention is an alloy material consisting of 87 to 93% by weight of Pd and 7 to 13% by weight of Ru, with 1 to 10% by weight of Mn and 1 to 10% of Si, without changing the composition ratio. ,
Bi and Ge are added in an amount of 0.5 to 3% by weight.

Another sliding contact material of the present invention is P d 87-9
3% by weight of Mn and 7-13% by weight of Ru without changing the composition ratio.
0.5 to 3% by weight of at least one of i, Bi, and Ge is added, and further 0.01 to 065% by weight of Fe group metal.
It is made by adding.

In the sliding contact material of the present invention, Mn is added in an amount of 1 to 10% by weight (2) to an alloy material consisting of 87 to 93% by weight of P d and 7 to 13% by weight of Ru without changing the composition ratio. The reason for adding 0.5 to 3% by weight of at least one of Si, Bi, and Ge is to make the alloy material hard to improve its wear resistance.
If at least one of , Bi, and Ge is less than 0.5% by weight, the effect cannot be exhibited, and if Mn is more than 10% by weight or S
If at least one of i, Bi, and Ge exceeds 3% by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable.

In addition, 1 to 10% by weight of Mn and S
i.

In addition to adding 0.5 to 3% by weight of at least one of Bi and Ge, the reason for adding 0.01 to 0.5% by weight of Fe group metal is to refine the crystal grains and further improve wear resistance. If it is less than 0.01% 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 not shown in the left column G below, each wire diameter was 0.71.
Make a brush wire rod, cut each into 8 lengths, put two of them in parallel, and weld one end to a composite material with a width of 10 lengths and a length of 3) and a thickness of 0.21 mm, and the other end. A brush contact was made by bending the 2R arc-shaped contact part. Then, each brush contact was brought into contact with a disk-shaped commutator, the commutator was rotated forward and backward, and a sliding test was conducted 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: 12V Load: Resistive load Rotation speed: 1000 rpm Peripheral speed
:130-120 m/min contact crab 10
0g Test time: 7 hours (blank below) (4) (ζ) As is clear from the table below, the brush contacts of Examples 1 to 4 had significantly less wear compared to the conventional brush contacts, and the contact It can be seen that the resistance is low and stable.

This is simply due to the fact that the sliding contact material of the present invention constituting the brush wire of the brush contacts of Examples 1 to 4 contains Mn, Si, and Bi.
, hardened by the addition of at least one type of Ge,
This is because it 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 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,
Compared to conventional sliding contact materials, it has significantly superior wear resistance, generates extremely little abrasion powder, and has the effect of providing a brush contact with low and stable contact resistance and almost no noise. .

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. (6)

Claims (1)

[Claims] 1) Adding 1 to 10% of Mn to an alloy material consisting of 87 to 93% by weight of Pd and 7 to 13% by weight of Ru without changing the composition ratio.
10% by weight and at least one of Si, Bi, and Ge.
A sliding contact material containing 5 to 3% by weight. 2) Adding 1 to 10% of Mn to an alloy material consisting of 87 to 93% by weight of Pd and 7 to 13% by weight of Ru without changing the composition ratio.
10% by weight and at least one of St, Bi, and Ge.
5 to 3% by weight is added, and further Fe group metal is added to 0.01 to 0.
．． Sliding contact material 3 containing 5% by weight