JPS59107050A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having superior wear resistance by adding at least one among Nb, In, Ba and Cd to a Pd-Ag-Cu alloy having a specified composition for a sliding contact material or by further adding an Fe group metal. CONSTITUTION:An alloy material obtd. by adding 0.5-15wt% at least one among Nb, In, Ba and Cd to an alloy material having a composition consisting of 30-50wt% Pd, 20-40wt% Ag and 20-40wt% Cu without changing the ratio in the composition is used as a sliding contact material, especially a brush contact material. To the alloy material may be further added 0.01-0.5wt% Fe group metal such as Fe, Ni or Co. A brush contact having superior wear resistance producing a small amount of powder owing to wear is obtd.

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 50% Pd, 20 to 40% by weight, and 40% by weight Cu2O are widely used as materials for brush contacts. It was 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 to eliminate such drawbacks, and uses the above-mentioned alloy material as a base material and adds a specific material to it, uses the generated oxide as a lubricant, and improves wear resistance. The present invention aims to provide a sliding contact material.

One of the sliding contact materials of the present invention includes P d 30-50 wt%, Ag2O-40 wt 5i, Cu 20-4
0.5% by weight of at least one of Nb, In, Ba, and Cd without changing the composition ratio.
It is made by adding ~15% by weight.

Another sliding contact material of the present invention is P d 30-5
0% by weight, Ag2O~40% by weight, Cu 20~4
0% by weight of at least one of Nb, In, Ba, and Cd without changing the composition ratio.
5 to 15% by weight is added, and further Fe group metal is added in an amount of 0.01 to 15% by weight.
It is made by adding 0.5% by weight.

In the sliding contact material of the present invention, Nb is added to an alloy material consisting of 30 to 50% by weight of Pd, 40 to 40% by weight of Ag2O, and 40% by weight of Cu2O without changing the composition ratio.
The reason why at least one of In, Ba, and Cd is added by weight of 0.5 to 15% is to generate an appropriate amount of oxide that becomes a lubricant to improve the wear resistance of the alloy material.
If it is less than 0.5% by weight, the amount of oxide generated is small and cannot be effective as a lubricant, and if it exceeds 15% by weight, the amount of oxide generated is large, resulting in high contact resistance (and also It is stable.

Further, in addition to the alloy material in which 0.5 to 15% by weight of at least one of Nb', In, Ba, and Cd is added, F
The reason why 0.01 to 0.5% by weight of Group E metal 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 will not appear. , if it exceeds 0.5% by weight? 1! It is a hindrance to oxides that act as lI lubricants.

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, wires i1Q and 7f were prepared, respectively.
Make a brush wire of i, cut it into 8 lengths each, and make 2
These were arranged in parallel and one end was welded to a composite material having a width of IQ mm, a length of 13 fi, and a thickness of 0.21 mm, and a 2R arc-shaped contact portion was bent at the other end to make a brush contact. 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: 12cm Load: Resistive load Rotation speed: 11000rp Peripheral speed: 130-120m/
min contact crab 100g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 7 had significantly less wear than the conventional brush contacts, and the contact resistance was low and stable. It can be seen that

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 7, is
This is because oxides such as n, Ba, and Cd are generated, and these oxides act as lubricants, 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 contacts of Examples 5 to 7 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 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. .

Claims (1)

[Claims] 1) Pd 30-50% by weight, Ag2O-40% by weight, C
A sliding contact material made by adding 0.5 to 15% by weight of at least one of Nb, In, Ba, and Cd to an alloy material consisting of u2O to 40m1t)% without changing the composition ratio. 2) Pd 30-50% by weight, Ag2O-40% by weight,
To an alloy material consisting of Cu2O to 40% by weight, 0.5 to 15% by weight of at least one of Nb, In, Ba, and Cd is added without changing the composition ratio, and 0.01 to 15% by weight of Fe group metal is added. A sliding contact material containing 0.5% by weight.