Thomas E Peters

US Patent:

42171393, Aug 12, 1980

Filed:

Dec 18, 1978

Appl. No.:

5/970507

Inventors:

Han J. Kim - Greensburg PA
Thomas E. Peters - Chelmsford MA
David Snee - Murraysville PA

Assignee:

GTE Products Corporation - Stamford CT

International Classification:

B22F 300

US Classification:

75206

Abstract:

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.

US Patent:

42946166, Oct 13, 1981

Filed:

Jan 2, 1979

Appl. No.:

6/000628

Inventors:

Han J. Kim - Greensburg PA
Thomas E. Peters - Chelmsford MA
John Gustafson - Harvard MA

Assignee:

GTE Products Corporation - Stamford CT

International Classification:

H01H 102

US Classification:

75234

Abstract:

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.

US Patent:

43610331, Nov 30, 1982

Filed:

Dec 10, 1980

Appl. No.:

6/214819

Inventors:

Han J. Kim - Greensburg PA
Thomas E. Peters - Chelmsford MA
John Gustafson - Harvard MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

G01N 1302

US Classification:

73 644

Abstract:

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.