Method of making electrical contacts

Details Method of making electrical contacts Method of making electrical contacts

1982-01-04

1984-05-22

Hunt, Brooks H.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 27, 419 47, 419 31, 419 33, 75244, 75247, 75254, 200265, 252513, B22F 100, B22F 300

Patent

active

044501358

ABSTRACT:
A method of preparing electrical contacts and electrical contact materials comprises the steps of blending a conductive metallic component, such as silver, with nickel and zirconium diboride which is substantially completely free of oxides, pressing the powder mixture to form a pre-sintered compact, and thereafter liquid phase sintering the compact to a densified body.
The zirconium diboride is mixed with about 2 weight percent of a reducing agent, preferably mixed carbon and boron powders, and heated to remove oxides from the surface of the zirconium diboride powder particles prior to the steps of pressing and sintering.

REFERENCES:
patent: 2180956 (1939-11-01), Hensel
patent: 2234969 (1941-03-01), Hensel et al.
Schlechten, A. W., "Zirconium", from Rare Metals Handbook, Hampel, ed., 1954, pp. 606-607.
Schwartzkopf and Kieffer, Refractory Hard Metals, p. 55, pp. 89-94, p. 282.

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