JPH01263236A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain an electrical contact material having excellent arc resistance and less consumption by manufacturing an electrical contact material accompanying sliding with an Ag alloy contg. specific amounts of Li, In, Mg, Pd, etc. CONSTITUTION:The electrical contact material accompanying sliding such as a micromotor and a slip ring is manufactured with an Ag alloy having the compsn. contg. at least one kind among, by weight, 0.1-6% Li, 0.1-2% In, 0.1-5% Mg and 0.1-5% Pd, or furthermore contg. at least one kind among the iron metals such as Fe, Ni and Co and the balance constituted of Ag. The electrical contact material having improved arc resistance and less consumption at the time of sliding can be obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a sliding contact material that improves arc resistance and reduces wearability of electric contact materials that involve sliding, such as micro motors and slip rings. It is related to.

[Conventional technology]

Ag-Cu alloys containing approximately 1 to 10-t% of Ag or Cu are used as sliding contact materials for micromotors, slip rings, and the like. These contact materials that have been commonly used in the past have a problem in that they do not have sufficient wear resistance due to sliding, and in particular, the commonly used contact materials made of Ag-Cu are resistant to C generated during sliding.
It is believed that the oxides of u have a negative effect on the contact properties and increase the amount of sliding wear.Therefore, there has been a strong demand for a contact material that is highly resistant to wear and exhibits less wear during sliding.

[Problems to be Solved by the Invention] The present invention was made as a result of studies on the above problems, and provides a sliding contact material that improves the arc resistance of contact materials that involve sliding and significantly reduces the amount of material consumption. It was developed.

[Means and effects for solving the problems] The present invention
Contains i 0.1-6 wt%, In 0.1-2-L%
, Mg 0.1-5wt%, Pd 0.1-511
A sliding contact material containing at least 141% of Li, with the remainder being Ag, and containing 0.1 to 6% of Li;
In 0.1-2 t%, M g 0.1-5 t%, P
d 0.1 to 5-t% of at least one of Fe and Ni.

At least one Fe group element such as CO from 0.03 to 0
．． This is a sliding contact material consisting of 6 wt% and the balance being Ag.

That is, the present invention improves arc resistance by adding Li to Ag, reduces the amount of material wasted during sliding, and improves lubrication by adding at least one of In, Mg, Pd, etc. In addition to improving the properties and hardness, Fe and N
By adding at least one Fe group element such as i, CO, etc., crystal grains are made finer and wear resistance is improved.

However, in the present invention, the composition of the material is limited as described above because Li improves arc resistance and reduces consumption, but if it is less than 1wt%, the effect is small, and if 6wt%
This is because if it exceeds this, segregation occurs during casting and increases sliding wear. Furthermore, In, Mg, Pd, etc. all improve lubricity and hardness, but the amount of each is 0.
The effect is small if it is less than 1wt%, and In is 2wt%,
This is because contact resistance increases when Mg and Pd each exceed 5 wt%. These elements exhibit similar effects whether added alone or in combination. Also Fe, N
Fe group elements such as i and Co refine the crystal grains of the material,
It improves wear resistance, but the amount is 0.03wt.
If it is less than 0.6 wt%, the effect will be small, and if it exceeds 0.6 wt%, segregation will occur during casting, increasing sliding wear.

The same effects can be obtained even when these elements such as Fe and Ni5Co are added individually or in combination.

〔Example〕

An embodiment of the present invention will be described below.

Molten ingots containing alloys having various compositions shown in Table 1 were prepared, and the ingots were conventionally hot rolled and cold rolled to form temporary ingots, which were processed and finally finished into commutators for micromotors. This material was brought into contact with a brush made of Ag-Pd 10-70% alloy, and the voltage was 6■, the current was 0.5A, and the rotation speed was 1.0
OOrpm, contact pressure 20gr.

The amount of wear of the sample was measured with a sliding time of 48 hours.

The results are also listed in Table 1.

As is clear from Table 1, the amount of consumption of conventional sliding contact materials made of Ag-Cu is 9.9 to 11.2 cm and 135 to 142 mg for brushes and commutators, respectively. The material according to the invention has a brush size of 5.1 to 7.8
(2) The commutator is 89 to 121 (2), and its wear amount is significantly reduced. Further, the contact resistance shows a value approximately equal to that of the conventional material Ag-Cu. In addition, the comparative material Nα15.16 Li
, those with a small amount of In had the same amount of wear as conventional materials and were not improved;
No. 18 has a large amount of oxide due to heat generation during sliding, which increases contact resistance and conversely increases wear amount.

[Effect] As explained above, the present invention improves the arc resistance of electrical contacts that involve sliding, significantly reduces the amount of material consumption, and greatly extends the life of contact materials. This has a remarkable effect.

Claims (2)

[Claims] (1) Contains 0.1 to 6 wt% of Li, 0.1 to 2 wt% of In
%, Mg0.1 to 5 wt%, and Pd0.1 to 5 wt%, with the balance being Ag. (2) Contains 0.1 to 6 wt% of Li, 0.1 to 2 wt% of In
%, Mg0.1-5wt%, Pd0.1-5wt%, and further contains F such as Fe, Ni, and CO.
A sliding contact material containing 0.03 to 0.6 wt% of at least one type of group e element, and the balance being Ag.