Multilayer hard coating for tools
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United States of America Patent
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Mar 25, 2008
Grant Date -
Oct 5, 2006
app pub date -
Jul 11, 2005
filing date -
Apr 1, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multilayer hard coating for tools for machining applications with a multilayer structure for improving the wear resistance of workpieces includes at least one (Al.sub.yCr.sub.1-y) X layer (0.2.ltoreq.y.ltoreq.0.7), wherein X is one of the following elements N, C, B, CN, BN, CBN, NO, CO, BO, CNO, BNO, CBNO, but preferably N or CN, and/or a (Ti.sub.zSi.sub.1-z) layer (0.1.ltoreq.z.ltoreq.0.3). The hard coating also includes at least one layer stack with one (AlCrTiSi) X mixed layer, followed by another (Ti.sub.zSi.sub.1-z) X layer, followed by another (AlCrTiSi) X mixed layer, followed by another (Al.sub.yCr.sub.1-y) X layer.
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