Patent ID: 7429151
Filing Date: 2008-09-30
Classification: C23C,Y10T

Abstract:
1. A cutting tool insert comprising a cemented carbide body and a coating wherein said cemented carbide body comprising WC with an average grain size of from about 1 to about 2.5 μm, from about 5 to about 8 wt-% Co and less than about 0.5 wt % cubic carbides of the metals Ta, Ti and/or Nb and a highly W-alloyed binder phase with a CW-ratio of 0.75-0.93 with less than about 1 vol-% eta-phase, and said coating comprising a first, innermost layer of TiC a layer of TiC a layer of a smooth, fine-grained, from about 0.5 to about 2 μm average grain size κ-Al an outer layer of TiN with a thickness of from about 0.5 to about 1.0 μm, wherein the radius of the uncoated cutting edge is from about 35 to about 60 μm.