Hard sintered body for tools

Details Hard sintered body for tools Hard sintered body for tools

1989-12-13

1991-08-20

Dean, R.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 96, 75241, 75244, 420580, C04B 3556, C22C 2902, C22C 2914

Patent

active

050413996

ABSTRACT:
A hard sintered body for tools is obtained by sintering under a superhigh pressure, a sinter powder mixture containing at least 20 percent by volume and not more than 70 percent by volume of cubic boron nitride powder and having a remainder formed of a binder powder mixture. The binder contains at least 2 percent by weight and not more than 20 percent by weight of Al and at least 2 percent by weight and not more than 20 percent by weight of W, and has a remainder formed of a Ti compound or compounds. The atomic ratio of Ti contained in the binder to a transition metal element or elements belonging to any of the groups IVa, Va and/or VIa of the periodic table including Ti is at least 2/3 and not more than 97/100. In the structure of the sintered body, cubic boron nitride crystals are bonded with each other through bonding phases formed by the binder. For forming the sintered body, at least one or more Ti compounds are selected from a group of TiN.sub.z, Ti(C,N).sub.z, TiC.sub.z, (Ti,M)N.sub.z, (Ti, M) (C,N).sub.z and (Ti,M)C.sub.z, wherein M represents a transition metal element or elements belonging to any one of the groups IVa, Va and/or VIa of the periodic table excluding Ti, and z is within the range of 0.1.ltoreq.z.ltoreq.0.40. Such a sintered body has an excellent crater wear resistance, so that it can be used for making tool inserts for high-speed cutting of steel or cast iron.

REFERENCES:
patent: 4375517 (1983-03-01), Watanabe et al.
patent: 4693746 (1987-09-01), Nakai et al.
patent: 4911756 (1990-03-01), Nakai et al.

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