Metal diboride base sintered ceramic and method of producing sam

Details Metal diboride base sintered ceramic and method of producing sam Metal diboride base sintered ceramic and method of producing sam

1990-03-09

1991-05-28

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

050195409

ABSTRACT:
The invention provides a sintered ceramic of which the principal component is TiB.sub.2 and/or ZrB.sub.2. The sintered ceramic contains a vanadium compound such as VC, VB or VN and/or a molybdenum compound such as MoC, MoSi.sub.2 or MoB such that the content of V and/or Mo is 0.5-99.5 wt % of the principal component. Furthermore, the sintered ceramic contains at least one nitride such as TiN, ZrN, TaN or CrN amounting to 1-50 wt % of the principal component and carbon amounting to 0.5-10 wt % of the principal component. The sintered ceramic is high in hardness and mechanical strength and, by virtue of including a nitride in the additives, is particularly enhanced in fracture toughness. The sintered ceramic is produced by mixing a principal material, TiB.sub.2 and/or ZrB.sub.2, with at least one vanadium or molybdenum compound, or elementary V and/or Mo, at least one nitride and carbon or a carbonizable material, compacting the resulting mixture into a shaped body and sintering the shaped body in vacuum or a nonoxidizing gas atmosphere at 1600.degree.-2200.degree. C.

REFERENCES:
patent: 2872327 (1959-02-01), Taylor
patent: 3649314 (1972-03-01), James
patent: 4379852 (1983-04-01), Watanabe et al.
patent: 4889836 (1989-12-01), Buljan et al.

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