JPS605848A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having superior wear resistance by adding apecified elements to an Au-Pt-Pd-Ag alloy without changing the ratio in the composition. CONSTITUTION:To an alloy for a sliding contact material having a composition consisting of, by weight, 19-21% Au, 4-6% Pt, 44-46% Pd and 29-31% Ag are added 1-10wt% Zn and 0.5-3wt% at least one among Si, Zr, Bi, Ge and Ga without changing the ratio in the composition. By adding the elements, the hardness of the alloy is increased, so the resistance of the alloy to wear during sliding along a commutator is improved. When 0.01-0.5wt% Fe group metal such as Ni is substituted for part of Zn, the grains of the alloy are made fine to further improve the wear resistance.

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, materials for brush contacts include Au 19-21% by weight, Pt 4-6% by weight, Pd 44-46% by weight, Ag.
Alloy materials consisting of 29-31% by weight were widely used.

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

The present invention has been made in order 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 slight amount of a specific element to the alloy material. This is what I am trying to do.

The sliding contact material of the present invention has an Au of 19 to 21% by weight.

Pt4-6% by weight, Pd44-46% by weight, Ag29-
31% by weight of Zn and 1 to 10% by weight of St, Zr, and Bi without changing the composition ratio.

It is made by adding 0.5 to 3% by weight of at least one of Ge and Ga.

In the sliding contact material of the present invention, Au 19-21% by weight, Pt 4-6% by weight, Pd 44-46% by weight, Ag
1 to 10% by weight of Zn, St, and Zr without changing the composition ratio to an alloy material consisting of 29 to 31% by weight.

0.5 to 3% by weight of at least one of Bi, Ge, and Ga
The reason why it is added is to make the alloy material harder and improve its wear resistance, and Zn is less than 1% by weight or Si,
Ni containing less than 0.5% by weight of at least one of Zr, Bi, Ge, and Ga cannot exhibit its effects;
Si, Z'r over 0 weight equipment.

If at least one of Bi, Ge, and Ga 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 Zn was replaced with O1 old ~ 0.5% by weight of Fe group metal is to refine the crystal grains and further improve wear resistance.
If it is less than 0.5% by weight, the effect of grain refinement will not appear.
Even if you exceed that amount, you will not get any better effect.

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, brush wire rods with wire diameters in order of 0.7 were made, and each of these was cut into a length of 8 mm. , two of them are arranged in parallel and one end has a width of 10m+n and a length of 13+a11. A brush contact was made by welding to a 0.2-thick tuna base material 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: 12■ Load: Resistance load Rotation speed: 1000 rpm Peripheral speed: 130-120 m/min Contact crab 10
0g Test time: 7 hours (blank space below) As is clear from the table above, the brush contacts of Examples 1 to 6 had significantly less wear than the conventional brush contacts (contact resistance was the same, low and stable). It can be seen that this is simply the sliding contact material of the present invention constituting the brush wire of the brush contacts of Examples 1 to 6, or the combination of Zn, Si, Zr, Bi, and Ge.
This is because the addition of at least one type of Ga increases hardness and improves wear resistance. In particular, the reason why the amount of wear of the brush contact of Example 6 is even smaller than that of the brush contacts of Examples 1 to 5 is that the LRE group metal is added to the sliding contact material of the present invention constituting the brush wire. This is because the crystal grains are finer than 4+11, and the wear resistance is further improved.

As detailed above, the sliding contact material according to the present invention has the following features:
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.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) A u 19-21 market volume%, Pt 4-6 vehicle volume%
, Pd: 44-46% by weight, Ag: 29-31% by weight.
A sliding contact material comprising 10% by weight and 0.5 to 3% by weight of at least one of Si, Zr, Bi, Ge, and Ga. 2) The 1t1 moving contact monthly charge according to claim 1, wherein a part of the Zn is replaced with 0.01 to 0.5% by weight of Fe group metal.