Internal oxidation method of Ag alloys
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United States of America Patent
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Jul 3, 1984
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N/A
app pub date -
Sep 21, 1982
filing date -
Sep 21, 1982
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Expired
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Abstract
Internal oxidation method of Ag alloys for electrical contact materials and the like, in which vacant lattice points or voids which form paths of oxygen and oxidation nuclei in the course of internal oxidation, are produced innumerably and on an atomic scale by having the alloys absorbed with hydrogen, helium, nitrogen, or neutron, or by having the alloys subjected to a reduction atmosphere of a decreased pressure or to vacuum, respectively prior to the internal oxidation. In the course of internal oxidation, solute metals fill in the voids and precipitate as oxides at the innumerable oxide nuclei on an atomic scale, without diffusing about much but only to such extent that they reach most adjacent voids, and consequently without any segregation and depletion thereof.
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