JPS58218715A - 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-soot oxide has conventionally been used as one of the electrical contact materials manufactured by internal oxidation.

Silver-soot oxide has excellent contact properties such as wear resistance and welding resistance, but has the disadvantage that oxides accumulate and contact resistance increases.

Therefore, the inventor of the present invention has conducted intensive studies to develop an electrical contact material having contact resistance characteristics superior to that of this electrical contact material, and has found 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 tin, more than 5% by weight of manganese and 10% by weight or less of manganese, and the balance silver. It is also internally oxidized.

Another electrical contact material of the present invention is bismuth 0.1~
5% by weight, 1-10% tin, and 5% manganese by weight.
100% by weight or less, 0% by weight of iron group elements, 1 to 0.5% by weight of O, and the balance is silver, and is internally oxidized.

In the electrical contact material of the present invention, bismuth is 0.1 to 5% by weight, tin is 1 to 10% by weight, and manganese is more than 5% by weight.
The reason for setting it below 0% by weight is that less than 0.1% by weight of bismuth has no effect of promoting internal oxidation of tin, less than 1% by weight of tin does not provide sufficient adhesion resistance, and 5% by weight of manganese
Below, low contact resistance characteristics cannot be obtained, and bismuth 5
If it exceeds 10% by weight, the melting point of the alloy decreases and internal oxidation becomes difficult at commercial temperature, and if it exceeds 10% by weight, the oxidized slag will aggregate and the contact resistance will become unstable. If it exceeds 0.1 to 5% by weight of bismuth, 5% by weight of manganese, and 5% by weight of manganese, manganese oxide will precipitate in layers and the contact resistance and welding resistance will deteriorate.
Within the range of % by weight or less, an electrical contact material with sufficiently satisfactory welding resistance, wear resistance, and contact resistance characteristics can be obtained.

Furthermore, in another one of the electrical contact materials of the present invention, iron group elements other than 0.1 to 5% bismuth, 1 to 1% by weight of IO, more than 5% by weight of manganese and 10% by weight or less 0.01
The reason for adding ~0.5% by weight is that when it is dispersed in an electrical contact material, the resulting bismuth oxide, #
This is because the consumption due to discharge is further reduced by the uniform and fine dispersion of manganese oxide and tin oxide, and if it is less than 0.01% by weight, bismuth oxide, manganese oxide and tin oxide will not be uniformly and finely dispersed. This is because if the weight percentage is exceeded, segregation of itself 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 explained.

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 2 days of internal oxidation, this oxidized atomized powder was compressed and sintered, extruded and pulled out, then cut and processed into a header to form a head diameter of 5M, 9J1^l crane, 1 leg diameter 2.5, fin 2. Fixed contact with leg length 2.5mm, head diameter 4m, head height 1.1m, leg diameter 2.8w, leg length 6wm.

A movable contact point of the head bulb nucleus 5R was obtained.

/ However, the bed-type electrical contacts made with the electrical contact materials of Examples 1 to 4 and the same size made with the material of the component composition of Conventional Example 1 shown in the left column of the table marked F by the same method as in the examples. When a glue bed type electrical contact was assembled into a hinge type relay and an opening/closing test was conducted under the following test conditions, the results shown in the right column of the table F were obtained.

Test condition voltage: AClooV 50H
Z Current: Input 408, Steady 108 Load: Resistance Switching frequency: 20 times/min Number of switching: Contact force until welding occurs: 40g (hereinafter F margin) As is clear from the table above, Example 1 Rivet-type electrical contacts made with the electrical contact materials listed in Items 4 to 4 have superior contact resistance characteristics, and are substantially less resistant to welding and abrasion than rivet-type electrical contacts made from conventional electrical contact materials. It turns out that they are equally good.

As described in detail below, the electrical contact material of the present invention has contact properties that are superior to conventional electrical contact materials in terms of contact resistance, so it is an epoch-making product that can replace conventional electrical contact materials. I can say that.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] ■) 0.1-5% bismuth and 1-10% tin by weight
An electrical contact material consisting of more than 5% by weight of manganese and less than 10% by weight of manganese, and the balance being silver, and is internally oxidized. 2) 0.1-5% bismuth and 1-10% tin
, more than 5% by weight and not more than 10% by weight of manganese, 0.01 to 0.5% by weight of an iron group element, and the balance being silver, and is internally oxidized.