Process for complex transient liquid phase sintering of powder metal
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United States of America Patent
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Issued Date -
Jun 2, 2005
app pub date -
Nov 28, 2003
filing date -
Nov 28, 2003
priority date (Note) -
Abandoned
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Abstract
A process is provided wherein a metal powder of iron or low alloy steel is mixed with a lubricant having a characteristic of becoming liquid under pressure and of evaporating under a sintering temperature and at least one liquid phase former to form a mixture. The mixture is compressed at a pressure sufficient to liquefy and uniformly distribute the lubricant within the compressed mixture with the lubricant effecting a uniform distribution of the liquid phase former on the particles of the metal powder. Upon sintering, the lubricant is evaporated and driven off and a liquid phase sintering of the liquid phase former with the particles of the metal powder occurs to obtain a product having a density of 99+% of theoretical density.
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