JPS5938345A - Electrical contact material - Google Patents

Abstract

PURPOSE:To obtain an electrical contact material with superior welding resistance by internally oxidizing an alloy prepared by adding specified percentages of Bi, In, Zn and Mn to silver. CONSTITUTION:A material consisting of, by weight, 0.1-5% Bi, 1-10% In, 1- 10% Zn, 1-10% Mn and the balance Ag or further contg. 0.01-0.5% of at least one among Fe, Ni, Co and Zr is prepared. The material having said composition is melted and atomized, and the atomized powder is internally oxidized to obtain an electrical contact material with superior welding resistance and contact resistance characteristics.

Description

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

Conventionally, silver-manganese oxide has been used as one of the electrical contact materials manufactured by internal oxidation method. Silver-manganese oxide has excellent contact performance such as arc resistance and wear resistance, but has poor adhesion resistance. , the contact resistance characteristics are poor.

Therefore, the inventor of the present invention has conducted intensive studies to develop an electrical contact material having contact characteristics superior in welding resistance than this electrical contact material, and as a result, has found a satisfactory electrical contact material.

One of the electrical contact materials of the present invention includes 0.1 to 5% by weight of bismuth, 1 to 10% by weight of indium, and 1 to 1% by weight of zinc.
, 1-10% by weight of manganese, balance silver, and is internally oxidized.

Another electrical contact material of the present invention is bismuth 0.1~
5% by weight, indium 1-10% by weight,! 0! Lead 1-1
0 wt ψ%, manganese 1-10 wt%, iron.

Low content of nickel, cobalt and zirconium.

It is a material consisting of 0.01 to 0.5 tonne weight percent of one type, and the balance being silver, and is internally oxidized.

In the electrical contact material of the present invention, bismuth 0.1 to 5N
! The reason why the amount of bismuth is 1-10% by weight, indium 1-10% by weight, and the weight% of manganese is 1-IO is that less than 0.1% by weight of bismuth has no effect of promoting internal oxidation and stabilizes the contact resistance. If it is less than 1% by weight of indium or zinc, it has no effect on improving welding resistance. If it is less than 1% by weight of manganese, good results cannot be obtained in terms of arc resistance or abrasion resistance. If it exceeds 10% by weight, the melting point of the alloy will drop too much, making internal oxidation difficult at high temperatures, and if it exceeds 10% by weight, indium oxide will accumulate during contact opening and closing, resulting in a significant increase in contact resistance and temperature. If it exceeds this level, oxides will precipitate in layers, resulting in wear resistance and welding resistance.

Bismuth: 0.1-5% by weight, Indium: 1-10% by weight, Zinc: 1-10% by weight, as they deteriorate the contact resistance characteristics.
Within the range of 1 to IO weight percent of manganese, an electrical contact material with sufficiently satisfactory welding resistance, abrasion resistance, and contact resistance properties can be obtained.

Furthermore, in another one of the electrical contact materials of the present invention, in addition to 0.1 to 5% by weight of bismuth, 1 to 10% by weight of indium, 1 to 10% by weight of zinc, and 1 to 10% by weight of manganese, iron,
0.0 with a needle made of at least one of nickel, cobalt, and zirconium. The reason for adding 1 to 0.5% by weight of O is that when it is dispersed in an electrical contact material, the resulting uniform and fine dispersion of bismuth oxide, indium oxide, zinc oxide, and manganese oxide further reduces consumption due to discharge. If the amount is less than 0.01% by weight, bismuth oxide.

This is because indium oxide, zinc oxide, and manganese oxide are not uniformly and finely dispersed, and if the amount exceeds 0.5% by weight, their segregation increases.

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 atomized powder was compressed and sintered, extruded and drawn, then cut and processed into a header to form a head diameter of 51 m, 1 head height, 1 fin, 2 leg diameters of 2.511+1. Fixed contact of crane with leg length 2.5 and head diameter 4 dragons 9 sieves 1.1 dragon 1 leg diameter 2.8 crane 9 leg length 1.6 fins.

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

However, bent-type electrical contacts made using the electrical contact materials of Examples 1 to 4 and rib contacts of the same size made using the materials having the compositions of the conventional examples shown in the left column of the table below in the same manner as in the examples are used. When a throat-type electrical contact was incorporated into a hinge-type relay and an opening/closing test was conducted under the test conditions below, the results shown in the right column of the table below were obtained.

Test condition voltage: AClooV 50H
Z current: input 40A, steady 10A negative
Load: Resistance Opening/closing frequency: 20 times/min Number of opening/closing times: Contact force until welding occurs: 40 g Breaking force: 45 g (blank below) As is clear from the table above, the electrical contacts made with the electrical contact materials of Examples 1 to 4 were It can be seen that the type electrical contacts are superior in welding resistance and contact resistance characteristics, and are almost equally excellent in abrasion resistance as compared to bent type electrical contacts and those made with conventional electrical contact materials.

As detailed above, the electrical contact material of the present invention has contact properties superior to those of conventional electrical contact materials in terms of welding resistance and contact resistance, 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.

Claims (1)

[Claims] 1) Hismuth 0.1-5 [t%, indium 1-10% by weight, zinc 1-10% by weight, manganese 1-10% by weight,
An electrical contact material consisting of a balance of silver and which is internally oxidized. 2) Bismuth 0.1-5% by weight, Innoum 1-10% by weight, Zinc 1-10% by weight, Manquan 1-10% by weight,
At least - of iron, nickel, cobalt, and zirconium
An electrical contact material consisting of a o, ot ~ 0.5% by weight, the balance silver, and which is internally oxidized at °C.