Electric contact material and method of producing the same
AssigneeNippon Telegraph & Telephone Public Corporation
InventorsKoichi Fujiwara, Goro Yamauchi, Kishio Arita, Shigeyuki Tsurumi
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Abstract
An electrical contact material and method of producing the same are provided. The material is an internally oxidized silver eutectic alloy system with a main component of silver to which at least one of silicon and germanium is added and, for characteristic improvement purpose, at least one selected from at least one of the groups consisting respectively of gold, platinum and the like, titanium, rhenium and the like, and iron, cobalt and the like is further added. In producing the material, an ingot of said alloy is hot-worked and then internally oxidized at a temperature in a range from 250.degree. C. to the eutectic temperature of the alloy.
Claims19
A method of producing an electrical contact material comprising a silver eutectic alloy comprising Ag as the main component in which fine oxide particles are uniformly dispersed, said method comprising the steps of:
- (a) admixing with Ag at least one element selected from the group consisting of Si and Ge;
- (b) melting said admixture of Ag and said at least one element to form an alloy;
- (c) quenching said alloy;
- (d) annealing said quenched alloy in a vacuum;
- (e) plastically working said annealed alloy;
- and
- (f) internally oxidizing said plastically worked alloy.
A method of producing an electrical contact material comprising a silver eutectic alloy comprising Ag as the main component in which fine oxide particles are uniformly dispersed, said method comprising the steps of:
- (a) admixing with Ag at least one element selected from the group consisting of Si and Ge and at least one additional element selected from at least one of the following groups wherein:
- the first group consists of Au, Pt, Pd, Rh, Ru, Os and Ir, and
- the second group consists of Ti, V, Zr, Nb, Mo, Ta, W and Re, and the third group consists of Fe, Co, Ni and Cu;
- (b) melting said admixture of Ag and said elements to form an alloy;
- (c) quenching said alloy;
- (d) annealing said quenched alloy in a vacuum;
- (e) plastically working said annealed alloy;
- and
- (f) internally oxidizing said plastically worked alloy.
Dependencies are inferred from the claim text.