Powder metallurgy lubricant compositions and methods for using the same
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United States of America Patent
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Feb 10, 2004
Grant Date -
Aug 28, 2003
app pub date -
Jan 25, 2002
filing date -
Jan 25, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to improved metallurgical powder compositions that incorporate solid lubricants, methods for preparing and using the same, and methods of making compacted parts. Ejection properties, such as stripping pressure and sliding pressure, of compacted parts can be improved by using the solid lubricants. The solid lubricants contain polyalkylene-polyalkylene oxide block copolymer lubricants or a combination of polyalkylene-polyalkylene oxide block copolymer lubricants and at least one additional lubricant. The polyalkylene-polyalkylene oxide block copolymer lubricants include at least one block A of a linear or branched polyalkylene chain having from about 5 to about 500 carbon atoms, and at least one block B of an alkylene oxide chain having a formula --[O(CH.sub.2).sub.r ].sub.m --, or --[(CH.sub.2).sub.r O].sub.m --. The polyalkylene block copolymer lubricants can have a formula represented as A-B or A-B-A.
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