High strength nitrogen-containing cermet and process for prepara

Details High strength nitrogen-containing cermet and process for prepara High strength nitrogen-containing cermet and process for prepara

1989-07-21

1991-01-15

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75239, 75242, 75244, 419 13, 419 14, 419 16, 419 17, C22C 2904

Patent

active

049850709

ABSTRACT:
There are disclosed a high strength nitrogen-containing cermet which comprises 7 to 20% by weight of a binder phase composed mainly of Co and/or Ni, with the balance being a hard phase composed mainly of TiC, TiN and/or Ti(C,N) and inevitable impurities, wherein the hard phase comprises 35 to 59% by weight of Ti, 9 to 29% by weight of W, 0.4 to 3.5% by weight of Mo, 4 to 24% by weight of at least one of Ta, Nb, V and Zr, 5.5 to 9.5% by weight of N and 4.5 to 12% by weight of C; and a process for preparing the same which comprises via the formulating, mixing, drying, molding and sintering steps of Co and/or Ni powder, at least one powder of TiC, Ti(C,N) and TiN, WC powder, Mo and/or Mo.sub.2 C, and at least one powder of carbides of Ta, Nb, V and Zr, wherein the sintering step is carried out by elevating the temperature up to 1350.degree. C. in vacuum, with the nitrogen atmosphere being made 1 torr at 1350.degree. C., increasing gradually the partial nitrogen pressure along with temperature elevation from 1350.degree. C. to the sintering temperature, with the nitrogen atmosphere being made 5 torr at the sintering temperature.

REFERENCES:
patent: 3994692 (1976-11-01), Rudy
patent: 4120719 (1978-10-01), Nomura et al.
patent: 4636252 (1987-01-01), Yoshimura et al.
patent: 4769070 (1988-09-01), Tobioka et al.
patent: 4857108 (1989-08-01), Brand et al.

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