JPS6026625A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material of superior wear resistance by adding specified amounts of Sn and one or more among Te, Sr and Zr 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% Sn and 0.1-3wt% one or more among Te, Sr and Zr 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 Sn.

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, Pd 30 to 70% by weight is used as a material for brush contacts.
, alloy materials consisting of 30-70% by weight of Ag were widely 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 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. It is kudzu.

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

Without changing the composition ratio of the alloy material consisting of 30 to 70% by weight of A g, 1 to 10% by weight of Sn and T e
.

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

In the sliding contact material of the present invention, Pd is 30 to 70% by weight.
, into an alloy material consisting of 30 to 70% by weight of Ag, without changing the composition ratio, add 1 to 10% by weight of Sn, 'pe,
The reason why 0.1 to 3% by weight of at least one of Sr and Zr is added is to improve the wear resistance of the alloy material.
This is to make it hard by dispersing intermetallic compounds of n and Te, Sr, and Zr.
If at least one of Zr and Zr is less than 0.1% by weight, its effects cannot be fully exhibited, and if Sn exceeds 10% by weight or ]e.

If at least one of Sr and Zr 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 Sn is replaced with Fe group metal in the range of o, oi to 0.5% by weight is to refine the crystal grains and further improve the 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, the wire diameter was 0. 'b+
* Make brush wire rods, cut each into 8 iris lengths and 1 irises,
Two pieces were placed in parallel and one end was welded to a base material with a width of 10 mm, a length of 13+ am, and a thickness of 0.2 inch, and a 2R arc-shaped contact portion was bent at the other end to create 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: 12V Load: Resistance load Rotation speed: 1000 rpm Peripheral speed = 130-120 m/min Contact crab 1
00g 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 because the sliding contact material of the present invention, which constitutes the brush wire of the brush contact points of Examples 1 to 4, becomes hard due to the dispersion of intermetallic compounds of Sn, Te, Sr, and Zr, and has a wear resistance. This is only because it improves your sexuality. 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 the sliding contact material of the present invention constituting the brush wire has F.
Group E metals are added to make the crystal grains finer,
This is because the wear resistance has 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) An alloy material consisting of 30-70% by weight of Pd and 30-70% by weight of Ag, without changing the composition ratio, contains 1-10% by weight of Sn and at least Te, Sr, and Zr. A sliding contact material made by adding 0.1 to 3% by weight of one kind. 2) The sliding contact material according to claim 1, wherein a part of the Sn is replaced by Fe group metal in a range of 0.01 to 0.5% by weight.