COATED HARD METAL MEMBER
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United States of America Patent
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Issued Date -
Jan 29, 2009
app pub date -
Nov 17, 2005
filing date -
Nov 17, 2005
priority date (Note) -
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Abstract
The invention relates to a coated hard metal body with increased wear resistance by means of a CVD coating and to a method for the production thereof. In order to improve the wear behavior of hard metal bodies, preferably cutting tools, in particular to reduce a crater wear, it is provided according to the invention that the sintered compact contains more than 5% by weight mixed carbides of the elements Ti and/or Nb and/or Ta, has on the surface a conditioning area with a carbon content and a nitrogen content that increases towards the outside, and has a fine-grained or microcrystalline bearing layer of nitride and/or carbide and/or carbonitride, which layer is applied according to the CVD method at a temperature exceeding 900° C.
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