Sintered carbonitride alloy with controlled grain size

Details Sintered carbonitride alloy with controlled grain size Sintered carbonitride alloy with controlled grain size

1992-05-06

1995-06-06

Mai, Ngoclan T.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75239, 75240, 75241, 75242, 75244, 419 13, 419 14, 419 15, 419 16, 419 23, 419 32, 419 38, C22C 2904

Patent

active

054218519

ABSTRACT:
The present invention relates to a sintered titanium-based carbonitride alloy for milling and turning where the hard constituents are based on Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W and the binder phase based on Co and/or Ni. The structure comprises 10-50% by volume hard constituent grains with core-rim-structure with a mean grain size for the cores of 2-8 .mu.m in a more fine-grained matrix with a mean grain size of the hard constituents of <1 .mu.m and where said mean grain size of the coarse hard constituents grains is >1.5 .mu.m, preferably >2 .mu.m, larger than the mean grain size for the grains in the matrix. The coarse grains can be Ti(C,N), (Ti,Ta)C, (Ti,Ta)(C,N) and/or (Ti,Ta,V)(C,N).

REFERENCES:
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patent: 4966627 (1990-10-01), Keshavan et al.
patent: 4985070 (1991-01-01), Kitamura et al.
Patent Abstracts of Japan vol. 013, No. 111 (C-577) 16 Mar. 1989 & JP-A-63 286 549 (Toshiba Tungalloy Co Ltd) 19 May 1987.
Patent Abstracts of Japan vol. 014, No. 261 (C-725) 6 Jun. 1990 & JP-A-20 73 946 (Toshiba Tungalloy Co Ltd) 13 Mar. 1990.

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