Patent ID: 9233422
Filing Date: 2016-01-12
CPC Classification: B22F,B23B,B23D,C22C,Y10T

Claim Text:
1. A superhard cutter element for machining a workpiece comprising wood, metal, ceramic material or composite material, the superhard cutter element comprising a superhard structure having a rake side and a flank side, the rake side and the flank side enclosing a wedge angle; and a protective layer bonded to the superhard structure at a rake interface on the rake side, the protective layer being softer than the material of the superhard structure; the wedge angle being at least 20 degrees and at most 75 degrees, a region of the protective layer proximate the cutting edge having a thickness in microns of at least (13.3-0.11ω) and at most the lower of (380-5.0ω) and (126.6-0.11ω), where the wedge angle ω is in the range from 35 degrees to 65 degrees.