JPS59110793A - Manufacture of electric contact - Google Patents

Abstract

PURPOSE:To obtain easily a composite contact comprising a combination of an arbitrary contact metal with a composite inorganic additive, by carrying out dispersion plating of particles of an organic compound such as PS or the like that contain additive particles of an arbitrary inorganic oxide to be dispersed into a contact metal such as gold, silver, etc., then treating the organic compound at high temperatures to be removed. CONSTITUTION:As an additive an inorganic oxide such as RuO2, SnO2, CdO, ZnO, etc. is suspended and solidified in an organic compound such as PS, polyamide, etc. to obtain an organic powder 3. The dispersion plating of the powder 3 and a contact metal 2 of gold, silver, a platinum group metal or its alloy is applied on a substrate metal 1 of an iron/Ni alloy or the like. This electric contact is treated at a high temperature of 600 deg.C or over under an oxidizing atmosphere so that the organic compound in the powder 3 is burnt or evaporated to be removed. Thus a composite contact can be easily obtained wherein the additive 4 is approximately uniformly dispersed and remained in the contact metal film 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a plated electrical contact such as a reed switch, and more particularly to a method for manufacturing an electrical contact using a conjugate film of gold, silver or an alloy thereof and an inorganic oxide.

In film-type electrical contacts such as reed switches, Au + Ay + Ru has traditionally been used to extend the contact life.
+ Metals such as Rh and Ru0z, 5nOz, Z
It is known that composite contacts with inorganic oxides such as nO2 and CdO2 are effective. However, it has not been easy to obtain a composite contact with a combination of any contact metal and a composite inorganic additive.

An object of the present invention is to provide a manufacturing method that allows easy manufacturing of long-life electrical contacts, particularly composite contacts of any contact metal and an additive material consisting of an inorganic oxide, which has been difficult to manufacture in the past. It is in.

For this purpose, the production method according to the present invention comprises polystyrene containing composite additive particles consisting of any inorganic oxide;
After dispersing and plating organic compound powder such as polyamide into contact metal such as gold or silver, this organic compound is burnt or vaporized by high temperature treatment, thereby dispersing the composite additive particles into the contact metal film. 17 to form a composite contact between the contact metal and the inorganic oxide.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged view showing a cross-sectional state of an electrical contact according to the present invention during manufacture. 5n02, ZnO2.

It is easy to obtain an organic powder by suspending and coagulating an inorganic oxide such as Cd0z+Ru0z as a composite additive in an organic compound such as polystyrene or polyamide. Alternatively, it is also easy to perform dispersion plating with a contact metal selected from any of these alloys. In the figure, 1 is a base metal such as iron-nickel alloy, 2 is a contact metal such as rhodium, ruthenium, or gold-cobalt alloy, and 3 is Run2.5nOz, Z.
It is an organic powder obtained by suspending and coagulating a composite additive 4 such as n0z and CdO2 in an organic compound such as polystyrene or polyamide.

Figure 2 shows the electrical and gas contacts shown in Figure 1 in an oxidizing atmosphere.
This figure shows the state after processing at a high temperature of 0° C. or higher to burn, vaporize, and remove organic compounds such as polystyrene in the organic powder.

By this high temperature treatment, a composite contact in which the composite additive 4 is almost uniformly dispersed and remains in the contact metal film can be easily obtained.

As described above, according to the present invention, a composite contact of any metal and any composite additive can be obtained relatively easily, and by using such an electrical contact, it has excellent welding resistance and a high breaking contact capacity. A reed switch with a large and long life can be realized.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a cross-sectional state of an electrical contact according to the present invention during manufacture, and Figure PX2 is a partial cross-sectional diagram of an electrical contact obtained by the method of the present invention. 1... Base metal, 2... Contact metal scrap, 3...
・Organic powder, 4...Complex additive. Agent Patent Attorney Toshiyoshi Somekawa

Claims (1)

[Claims] Contact metal made of gold, silver, platinum group metals, or alloys containing these metals and RuO2,5n02 rCd0
2. After dispersing and plating organic powder such as polystyrene and polyamide containing ZnOz and other inorganic oxides on the base metal, the above-mentioned polystyrene/,
1. A method for producing an electrical contact, comprising burning or vaporizing only an organic compound such as polyamide to form a composite film of the contact metal and the inorganic oxide.