Powder metallurgy repair technique
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Aug 27, 1990
filing date -
Aug 28, 1990
priority date (Note) -
Expired
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Abstract
To repair or join sections of a metal article, matching metal powder is sintered in the solid state to form a porous structure in the joint. A layer of matching powder, modified to incorporate melting point depressants such as boron and silicon is subsequently added to the surface of the sintered region. The joint is processed at a temperature where the modified layer melts while the sintered layer and base metal remain solid. The modified material flows into the sintered layer by capillary action and promotes liquid phase sintering, resulting in a dense joint with properties approaching those of the base metal.
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