Metal-based powder compositions containing silicon carbide as an alloying powder
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United States of America Patent
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Jan 27, 2004
Grant Date -
Jun 20, 2002
app pub date -
Nov 5, 2001
filing date -
Sep 3, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Metallurgical powder compositions are provided that include silicon carbide to enhance the strength, ductility, and machine-ability of the compacted and sintered parts made therefrom. The compositions generally contain a metal powder, such as an iron-based powder, that constitutes the major portion of the composition. A silicon carbide-containing powder is blended with the metal powder, preferably in the form of a silicon carbide powder. Optionally, common alloying powders, lubricants, binding agents, and other powder metallurgy additives can be blended into the metallurgical composition. The metallurgical powder composition is used by compacting it in a die cavity to produce a 'green' compact that is then sintered, preferably at relatively high temperatures.
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