Sintered body for high-accuracy working tools

Details Sintered body for high-accuracy working tools Sintered body for high-accuracy working tools

1989-12-13

1992-03-03

Dean, R.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75244, 501 87, 501 96, C22C 2914

Patent

active

050929208

ABSTRACT:
A sintered body for high-accuracy working tools is obtained by sintering powder mixture containing at least 45 percent by volume and not more than 60 percent by volume of cubic boron nitride powder having an average particle size of not more than 2 .mu.m and having a remainder formed of binder powder under a superhigh pressure. The binder contains at least 5 percent by weight and not more than 15 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 binder 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. When at least one or more Ti compounds are selected from a group of TiN.sub.z, Ti(C.sub.1-x N.sub.x).sub.z, (Ti,M) (C.sub.1-x N.sub.x ).sub.z and (Ti,M)N.sub.z, where M represents transition metal element or elements belonging to any of the groups IVa, Va and/or VIa of the periodic table excluding wherein z is within the range 0.45.ltoreq.z.ltoreq.0.65 and x is within the range of 0.50.ltoreq.x<1.0. A sintered body is obtained which is excellent in strength and improved in wear resistance and useful as a material for making high-accuracy cutting tools.

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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