Hard metal or cermet body and method for producing the same
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United States of America Patent
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Jun 9, 2009
Grant Date -
Feb 22, 2007
app pub date -
May 14, 2004
filing date -
Sep 12, 2003
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Abstract
A hard metal or cermet body has a 2 to 100 μm thick first layer having a binder metal proportion of 2 to 25 mass % and up to 25 volume % of a nitride or carbonitride of one or more metals of Group IVa of the periodic system or up to 10 volume % of a carbide or carbonitride of V, Nb, Ta or Cr, balance WC, whereby the amount of nitride, carbonitride or carbide of the afore-mentioned metals amounts to at least 0.01 volume %. Under the first layer is a 2 to 40 μm thick second layer with an enhanced nitrogen proportion relative to the first layer, is disposed. Thereunder is a transition zone with a thickness of 2 to 100 μm in which the composition gradually changes to a homogeneous composition in the inner core of the hard metal or cermet body.
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