Gte Laboratories Incorporated

Gte Products Corporation

Other

Han J Kim

F Joseph Reid

Thomas E Peters

John C Gustafson

Charles Brecher

Shinhoo Kang

Chi H Leung

Richard C Bevington

Philip C Wingert

Larry J Gaudino

Ron J DeNuccio

Frederick J Scimeca

David Snee

Philip Wingert

A material for electrical contact use has the following composition: 6 to 18 percent tin oxide, 0.25 to 1% germanium oxide, 0.2 to 2% indium oxide, balance silver, all percentages by weight. The material exhibits superior erosion characterstics.

Electrical contact material of Ag, SnO.sub.2, GeO.sub.2 and In.sub.2 O.sub.

Ferrous bimetals bearing easily read indicia and methods of making them. The bimetals of the present invention have a transparent oxide coating of a controlled thickness in the interference range and are prepared by immersing them in a acid bath, then washing away a film that is formed, followed by tempering them in an oxidizing atmosphere. Bimetals prepared this way have a golden hue an are easily marked with indicia that can be read by a consumer.

Bimetal thermostats and method of manufacture

A two-layer contact having a silver backing and a silver cadmium oxide body which backing is relatively free of warpage and macroscopic voids is produced from a mixture of silver oxide, silver acetate and silver.

Silver material suitable for backing of silver-cadmium oxide contacts

Addition of copper to silver-cadmium oxide by adding copper to submicron silver powder improves the morphology of the cadmium oxide in the sintered material and enables sintered densities greater than 96% of theoretical to be achieved.

Silver cadmium oxide electrical contacts

An additive for an electrical contact is selected according to a method wherein the additive has a substantially smaller contact angle with a liquid phase of a ductile metal than the weld inhibiting material has with the liquid phase.

Method for selecting an additive for electrical contacts

An electrical contact of the type having a working surface and comprising a ductile metal and weld inhibiting material includes a wetting agent present in an amount sufficient to reduce the surface energy between said contact surface and the liquid phase of the ductile metal. Improved wettability of the surface results in reduced arc erosion due to the spattering loss of ductile metal. Also, described is a method for selecting and testing proposed additives.

Electrical contacts

The instant invention relates to a method of preparing an electrical contact from sub-micron size silver and less than two micron size cadmium oxide particles with the contact having finally dispersed particles of cadmium oxide within grains of silver. In the instant invention the particles of silver and cadmium oxide are intimately blended together and subjected to a reducing atmosphere at a temperature of from 321.degree. C. to 550.degree. C. to reduce the cadmium oxide and form an alloy powder of cadmium and silver. The alloy formed is held at an elevated temperature following reducing and then oxidized at a temperature of from 321.degree. C. to 550.degree. C. to precipitate a dispersion of cadmium oxide within grains of silver and form a silver-cadmium oxide alloy powder. In an alternative embodiment an alloy powder of cadmium and silver already prepared from sub-micron size particles of silver and less than two micron size particles of cadmium oxide is heated to a temperature of from 321.degree. C. to 550.degree. C. in an inert atmosphere. The inert atmosphere is then changed to an oxidizing atmosphere at that temperature to precipitate the dispersion of cadmium oxide within the grains of silver. The material as prepared by both embodiments is then formed into an electrical contact.

Process of preparing an electrical contact material

This application describes the step-wise application of heat during the sintering of a mixture of silver and cadmium oxide to give an alloy having improved characteristics. These alloys are useful as electric contacts in high electric current applications.

Process for preparing silver-cadmium oxide alloys

This application describes a method of preparing cadmium-containing refractory metal-silver alloys by using a liquid phase sintering technique featuring a cadmium vapor over-pressure. The resultant alloys are useful as electric contacts in high electric current applications.

Process for preparing refractory metal-silver-cadmium alloys

This application describes the addition of an alkali metal, generally in the form of a salt thereof, to a mixture of silver and cadmium oxide, prior to the sintering step, to improve the as-sintered densities of the resultant alloy material.

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Greensburg, PA, United States of America

Han J Kim