JPS59113151A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material using oxides which are produced during sliding as a lubricant and having improved wear resistance by adding small amounts of one or more among B, Si, Ge and Tl and an Fe group metal to a Pt-Pd-Ag-Cu alloy having a specified composition. CONSTITUTION:This sliding contact material is obtd. by adding 0.5-10wt% one or more among B, Si, Ge and Tl to an alloy material consisting of, by weight, 0.1-1% Pt, 42-44% Pd, 39-41% Ag and 15.5-17.5% Cu without changing the ratio in the composition or by further adding 0.01-0.5wt% Fe group metal such as Fe. Oxides of one or more among B, Si, Ge and Tl are produced in the sliding contact material during sliding, and the oxides act as a lubricant to improve the wear resistance. The contact material produces little powder owing to wear and hardly generates noise, so a brush contact having stable and low contact resistance can be 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, as materials for brush contacts, P L O, 1 to 1% by weight, Pd 42 to 44% by weight, Ag 39 to 41% by weight (1
)%, and alloy materials consisting of 15.5-17.5% by weight of Cu were 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 was made in order to eliminate such drawbacks, and uses the above-mentioned alloy material as a base material and adds a small amount of a specific element to it, and uses the generated oxide as a lubricant to improve wear resistance. The present invention aims to provide a sliding contact material with improved properties.

One of the sliding contact materials of the present invention is P L O, 1-1% by weight, Pd 42-44% by weight, Ag 39-41% by weight.

Cu 15.5-17. In the alloy material consisting of Si content%,
It is made by adding 0.5 to 10% by weight of at least one of B, st, Ge, and TI without changing the composition ratio.

Another sliding contact material of the present invention includes 0.1 to 1% by weight of Pt, 42 to 44% by weight of Pd, 39 to 41% by weight of Ag,
B, 31. was added to the alloy material consisting of 15.5 to 17.5% by weight of Cu without changing the composition ratio. Ge.

(2) At least one type of TI is added in an amount of 0.5 to 10% by weight, and an Fe group metal is further added in an amount of 0.01 to 0.5% by weight.

In the sliding contact material of the present invention, pto, i ~ 1% by weight
, Pd 42-44% by weight, Ag 39-41% by weight.

An alloy material consisting of 15.5 to 17.5% by weight of Cu,
The reason why at least one of B, Si, Ge, and TI is added in an amount of 0.5 to 10 M% without changing the composition ratio is that it acts as a lubricant to improve the wear resistance of the alloy material. This is to generate an appropriate amount of oxides; if it is less than 0.5% by weight, the amount of oxides generated is too small to be effective as a lubricant, and if it exceeds 10% by weight, the amount of oxides generated increases.
The contact resistance becomes high and, moreover, it becomes unstable.

Further, the alloy material includes B, 31. The reason for adding 0.5 to 10% by weight of at least one of Ge and TI and 0.01 to 0.5% by weight of Fe group metal is to refine the crystal grains and further improve wear resistance. 0 for improving.
If it is less than 0.01% by weight, the effect of crystal grain refinement will not appear;
．． If the amount exceeds 5% by weight, the oxide acting as a lubricant (3) becomes a hindrance.

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 a brush wire of m length, cut it into 8 cranes each, and make 2
These are lined up and one end has a width of 10fi, a length of 131mm, and a thickness of 0.
A brush contact was made by welding to a 2U+ base 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
100g Test time: 7 hours (4) (5) 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. I know that there is.

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,
This is because oxides such as i, Ge, and TI are generated, and these oxides act as lubricants and improve wear resistance. Moreover, since the oxide is soft, it is easily removed by the sliding action, so the contact resistance remains unchanged. Especially Example 5
The reason why the amount of wear of the brush contacts of Examples 1 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, and the crystals of the Fe group metal are This is because the grains are finer and more dispersed, further improving wear 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 wear powder, generates almost no noise, and has a lower and more stable contact resistance than conventional sliding contact materials. (6) There is an effect that a brush contact point can be obtained.

(7) 247-

Claims (1)

[Claims] 1) Pt0.1-1% by weight, Pd42-44% by weight, A
B and St are added to an alloy material consisting of 39 to 41% by weight of G and 15.5 to 17.5% by weight of Cu without changing the composition ratio. A sliding contact material containing 0.5 to 10% by weight of at least one of Ge and TI. 2) PtO, 1-1% by weight, Pd 42-44% by weight, A
B and Si are added to an alloy material consisting of 39 to 41% by weight of G and 15.5 to 17.5% by weight of Cu without changing the composition ratio. A sliding contact material containing 0.5 to 10% by weight of at least one of Ge and TI and further 0.01 to 0.5% by weight of Fe group metal.