Ag-Metal oxides electrical contact materials
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United States of America Patent
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Oct 30, 1984
Grant Date -
N/A
app pub date -
May 16, 1983
filing date -
May 16, 1983
priority date (Note) -
Expired
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Abstract
Electrical contact materials of a silver base which have dispersed in their silver matrices 2-20 weight % of either one of or combination of fine oxide grains of Sn, Sb, Zn, In, and Bi, and which materials are diffused at their contact surfaces and for moderate depths adjacent thereto with Au, Pd, or alloys thereof, which gradually diminish in diffusion density from the contact surfaces to the moderate depths of the contact materials. The precious metal thus diffused in solid phase about the contact surfaces prevents their chemical aging and improves electrical performance such as anti-weldability, contact resistance, and endurance, without scattering from the contact surfaces or melting deeply all together into the matrices of the contact materials, and further without isolating from and coagulating spherically on the contact surfaces, even when they are subjected to electric arcs.
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