Method of making electrical contact material
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United States of America Patent
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Mar 4, 1997
Issued Date -
N/A
app pub date -
May 11, 1995
filing date -
Dec 19, 1991
priority date (Note) -
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Abstract
An electrical contact material having metal oxide particles dispersed in a silver metal matrix and having an easily brazeable backing layer is made free of internal oxide depletion zones by bonding a conventional internally oxidizable silver alloy to a thin backing layer of a second silver alloy to form a composite metal. The first silver alloy is selected to be internally oxidizable under selected oxidizing conditions. The second alloy is selected so that under the selected oxidizing conditions an oxygen-impenetrable barrier is quickly established on the surfaces of the composite formed by the second alloy. In that way, the first alloy layer is forced to be internally oxidized unidirectionally from the opposite surface of the composite to form the desired metal oxide dispersal extending substantially throughout the first alloy layer free of any internal oxide depletion zone in the first layer. An external scale that prevented internal oxidation from proceeding from the second layer surface is then easily removed from the remaining unoxidized silver alloy providing a means for attachment of the contact material by bonding or brazing.
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