JPS5914209A - Electric contact material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to electrical contact materials.

Silver-oxidized steel has conventionally been used as one of the electrical contact materials manufactured by the internal oxidation method. Silver-copper oxide has high electrical conductivity and low contact resistance, but it has poor abrasion resistance and welding resistance because the copper oxide particles are large.

Therefore, the inventor of the present invention has found that this electrical contact material has better welding resistance and
As a result of intensive research aimed at developing an electrical contact material with excellent wear resistance and contact properties, we have discovered a satisfactory electrical contact material.

One of the electrical contact materials of the present invention is a material consisting of 0.1 to 5% by weight of bismuth, 1 to 10% by weight of indium, 1 to 10% by weight of copper, and the balance being silver, and is internally oxidized. It is something that

Another electrical contact material of the present invention is bismuth θ′, 1
~5% by weight, 1-10% by weight of indium, and 1-1% by weight of copper.
0% by weight, 0.01 to 0.5% by weight of iron group elements, and the balance is silver, and is internally oxidized.

In the electrical contact material of the present invention, the reason for using 0.1 to 5% by weight of bismuth, 1 to 100% by weight of indium, and 1 to 1% by weight of copper is that less than 0.1% by weight of bismuth improves the welding resistance. If the indium content is less than 1% by weight, the copper oxide cannot be made fine and there is no effect of improving wear resistance. If the copper content is less than 1% by weight, good results cannot be obtained in terms of contact resistance. If bismuth exceeds 5% by weight, the melting point of the alloy decreases, making internal oxidation at the same temperature difficult. If indium exceeds 10% by weight, oxides accumulate on the surface when the contacts are opened and closed, increasing contact resistance and increasing temperature. 10% by weight of copper, the particles of oxidized 11-4 become larger and the abrasion resistance and contact resistance characteristics deteriorate. Within this range, an electrical contact material with sufficiently satisfactory welding resistance, abrasion resistance, and contact resistance properties can be obtained.

Furthermore, in another electrical contact material of the present invention, in addition to 0.1 to 5% by weight of bismuth, 1 to 10% by weight of indium, and 1 to 10% by weight of copper, 0.0% of an iron group element. The reason for adding 1 to 0.5 mi% of O is that it is dispersed in the electrical contact material*-1.
In the case of U, the resulting copper oxide.

This is because the uniform and fine dispersion of bismuth oxide and indium oxide further reduces consumption due to discharge.
．． If it is less than 0.01% by weight, copper oxide, bismuth oxide and indium oxide will not be uniformly and finely dispersed, and if it exceeds 0.5ml%, their segregation will increase.

Next, in order to clarify the effects of the electrical contact material according to the present invention, specific examples and conventional examples will be described.

After melting the materials having the compositions of Examples 1 to 4 shown in the left column of the table below to form atomized powder, the mixture was heated at 600°C, 9 atm,
After internal oxidation for 2 days, the oxidized aluminum and maize was compressed and sintered, extruded and drawn, then cut and processed to give a head diameter of 5+U, head height of 1, 9, leg diameter of 2. 5mm, leg length 2.5in fixed contact and head i'l-4mwa, head A
1. l+u++, leg diameter 2.8mm, leg length 1.6mm.

A movable contact with a spherical head 5R was obtained.

However, rivet-type electrical contacts made from the electrical contact materials of Examples 1 to 4 and glued bets of the same size made from materials with the compositions of the conventional examples shown in the left column of the table below in the same manner as in the examples. When the type electrical contact was assembled into a hinge type relay and an opening/closing test was conducted under the test conditions described in F, the results shown in the right column of the table below were obtained.

Test condition voltage: AClooV 50H
Z Current 2 Input 40A, Steady 10A Negative: Resistance switching axis i: 20 times/min Number of switching: Contact force at welding point: 40g (thought margin) = 32 As is clear from the table above, Examples 1~ Rivet-type electrical contacts made with the electrical contact material No. 4 have superior welding resistance and abrasion resistance, and are almost as good in contact resistance characteristics as rivet-type electrical contacts made with conventional electrical contact materials. It can be seen that

As stated above, the electrical contact material of the present invention has contact properties that are superior in welding resistance and abrasion resistance than conventional electrical contact materials, so it is an epoch-making material that can replace conventional electrical contact materials. It can be said that it is a thing.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. 33-

Claims (1)

[Claims] 1) 0.1 to 5% by weight of bismuth and 1 to 10% of indium
An electrical contact material which is internally oxidized and consists of 1% to 10% by weight of copper, the balance being silver. 2) 0.1-5% by weight of bismuth and 1-10% of indium
% by weight, 1-10% by weight of copper, and 0.0% by weight of iron group elements. Old ~ 0.
An electrical contact material consisting of 5% by weight and the balance silver and which is internally oxidized.