Hard and tough sintered body for a cutting tool

Details Hard and tough sintered body for a cutting tool Hard and tough sintered body for a cutting tool

C - Chemistry, Metallurgy

04

B

C04B 35/5831 (2006.01) C04B 35/583 (2006.01) C04B 35/626 (2006.01) B23B 27/14 (2006.01)

Patent

CA 2219638

A sintered body for a cutting tool consists of high-pressure phase boron nitride, a residual binder phase, plus unavoidable impurities, and contains high-pressure phase boron nitride powder which has been previously coated with a binder before sintering. The coating binder consists of an element belonging to group 4a, 5a or 6a of the periodic table, and has an average thickness of 5 to 300 nm. Binder powder other than the coating binder consists of an element belonging to group 4a, 5a or 6a of the periodic table, and the contact ratio of high-pressure phase boron nitride is at least 20% and less than 50%. The product is a high-pressure phase boron nitride-based hard and tough sintered body for a cutting tool which is improved in wear resistance and chipping resistance.

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