Electrical contact material of the Ag-CdO type and method of mak

Details Electrical contact material of the Ag-CdO type and method of mak Electrical contact material of the Ag-CdO type and method of mak

1973-05-24

1976-01-06

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

291825, 148 203, 148 32, C22C 500

Patent

active

039308499

ABSTRACT:
Ag-CdO type material suitable for use as an electrical contact material in a switching device such as a circuit breaking device is disclosed. The material contains Ag and CdO with an oxide of Sn and an oxide of an additive metal selected from Mg, Ca, or mixtures of oxides of such additive metals. The additive metal appears to form an oxide of the metal earlier during oxidation of the material than either the Sn or Cd thereby acting as a nucleating site for the formation of the oxides of the Sn and Cd. The oxide of the metals appears to tend to grow as a mixture of the oxides of the additive metal, Cd and Sn. This material has good high temperature properties, undergoes oxidation of the oxidizable constituents at a high rate and has a fine oxide particle size.
The method of making the Ag-CdO type material.

REFERENCES:
patent: 2796346 (1957-06-01), Stumbock
patent: 3472654 (1969-10-01), Comey et al.
patent: 3607244 (1971-09-01), Kabayama
patent: 3694197 (1972-09-01), Zdanuk et al.
patent: 3694198 (1972-09-01), Krock et al.

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