Hard and tough sintered body

Details Hard and tough sintered body Hard and tough sintered body

1997-10-30

1999-12-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 87, 501 961, 501 986, C04B 355835

Patent

active

060017589

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

REFERENCES:
patent: 5106392 (1992-04-01), Slutz et al.
patent: 5200372 (1993-04-01), Kuroyama et al.
patent: 5466642 (1995-11-01), Tajima et al.
patent: 5536485 (1996-07-01), Kume et al.
patent: 5569862 (1996-10-01), Kuroyama et al.
patent: 5604164 (1997-02-01), Montgomery et al.
patent: 5639285 (1997-06-01), Yao et al.

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