JPS58193333A - Electric contact material - Google Patents

Abstract

PURPOSE:To enhance the welding resistance and the consumption resistance of an obtained electric contact material, by subjecting a specific compositional material containing Bi and Cd and comprising the remainder Ag to internal oxidation. CONSTITUTION:A powdery material containing 0.1-10wt% Bi, 0.5- less than 5wt% Cd, according to necessity, further 0.01-1wt% ferrous element and comprising the remainder Ag is subjected to internal oxidation. This oxidized powder is compressed and sintered to be formed into an electric contact material. By appropriately processing this material, an electric contact can be obtained.

Description

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

Silver-bismuth oxide has conventionally been used as one of the electrical contact materials manufactured by internal oxidation. Silver-bismuth oxide has contact performance with excellent arc resistance and welding resistance, but is subject to large wear due to arcing and is inferior in voltage resistance and insulation resistance.

Therefore, the inventor of the present invention has conducted extensive research to develop a 1N electrical contact material that has contact properties that are more resistant to arc wear than this electrical contact material, and has found a satisfactory electrical contact material. Ru.

One of the electrical contact materials of the present invention is bismuth 0.1-1O
% by weight, less than 0.5-5% by weight cadmium, and the balance silver, and is internally oxidized.

Another electrical contact material of the present invention is bismuth 0.1~
10% by weight, less than 0.5 to 5% by weight of cadmium, 0.01 to 1% by weight of iron group elements, and the remainder silver, and is internally oxidized.

In the electrical contact material of the present invention, bismuth 0.1 to 10
The reason why the weight percent of cadmium is less than 0.5 to 5 weight percent is that bismuth is less than 0.1 weight percent and cadmium is less than 0.5 weight percent.
If the amount of silver is less than 10% by weight, the silver content will be too large, and although low contact resistance properties can be obtained, good results will not be obtained in terms of welding resistance and abrasion resistance.If it exceeds 10% by weight, the melting point of the alloy will drop too much and the alloy will not be heated at high temperatures. Internal oxidation of cadmium becomes difficult, and if cadmium exceeds 5% by weight, the welding resistance of silver-bismuth oxide deteriorates (2). Within the range, welding resistance properties,
An electrical contact material having sufficiently satisfactory wear resistance properties can be obtained.

Furthermore, in another electrical contact material of the present invention, bismuth is 0.1 to 10% by weight and cadmium is 0.5 to 5% by weight.
The reason for adding 10.01 to 1% by weight of iron group light is that when it is dispersed in an electrical contact material, the resulting uniform and fine dispersion of bismuth oxide and cadmium oxide further reduces consumption due to discharge. If it is less than 0.01% by weight, bismuth oxide and cadmium oxide will not be uniformly and finely dispersed, and if it exceeds 1% by weight, 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 material having the composition of Example 1.2 shown in the left column of the table below and making it into atomized powder, it was heated at 600°C, 9 atm,
After internal oxidation for 2 days, this oxidized atoma (3) powder was compressed and sintered, extruded and drawn, then cut and processed into headers, with a head diameter of 5+im and a head height of 1.0 mm.
, leg diameter 2.5m, leg length 2.5fl fixed contact and head diameter 4m, SQl height 1.0m, leg diameter 2.8m, leg length 1.6
(2) A spherical 5R movable contact was obtained in part aI.

In addition, materials having the compositions of Examples 3 and 4 shown in the left column of the table below were melted to form atomized powder, which was internally oxidized at 600°C and 9 atm for 2 days, then compressed and sintered, and then extruded. , After drawing, cutting and header processing, head diameter 5 2 cranes height 1.0 m, leg 1! A fixed contact of 2.5×5 cranes with a leg length of 2.5 and a movable contact with a head diameter of 4 cranes, 9 cranes, a height of 1.0 m, a leg diameter of 2.8 m, a leg length of 1.6 m, and a spherical head of 5R were obtained.

However, the rivet-type electrical contacts made from the electrical contact materials of Examples 1 to 4 and the materials having the component composition of Conventional Example 1 shown in the left column of the table below were used in Example 1. Glue bed type electrical contacts of the same size made using the same method as 2 were assembled into a hinge type relay and an opening/closing test was conducted under the following test conditions, and the results shown in the right column of the table below were obtained. ') (4) Test conditions full FE□: AClooV
50Hz current: input 40A, steady 10
A negative! : Resistance switching frequency: 20 times/min Switching/closing frequency: Until welding occurs (5) If it is 10 mA or more, it was judged as a failure.

As is clear from the table above, the rivet type electrical contacts made with the electrical contact materials of Examples 1 to 4 have better voltage resistance and durability than the repair) type electrical contacts made with the electrical contact material of Conventional Example 1. The wear characteristics are universally excellent, and the welding resistance is almost the same.
It turns out that it is true.

As detailed above, the electrical contact material of the present invention has contact properties that are superior to conventional electrical contact materials in terms of durability, voltage characteristics, and wear resistance, so it can replace conventional electrical contact materials. It can be said to be groundbreaking.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. (7)

Claims (1)

[Claims] 1) 0.1 to 10% by weight of bismuth and cadmium 065
An electrical contact material comprising less than ~5% by weight, the balance silver, and which is internally oxidized. 2) Bismuth 0.1-10% by weight and cadmium 0.5
An electrical contact material which is internally oxidized and comprises less than ~5% by weight of an iron group element, 0.01-1% by weight of an iron group element, and the balance.