Process for producing sintered body of metal boride and raw mate

Details Process for producing sintered body of metal boride and raw mate Process for producing sintered body of metal boride and raw mate

1991-04-08

1992-01-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 93, 501 94, 264 65, C04B 3558

Patent

active

050810774

ABSTRACT:
A process for producing a metal boride sintered body having a density of at least 90% of the theoretical density and a raw material composition therefor. The raw material composition is composed of a metal oxide, a metal carbide, and boron carbide, the amount of boron carbide being 5 to 20% more than the amount stoichiometrically required to form a metal boride by reaction of boron in the boron carbide with the metal element(s) in the metal oxide and metal carbide. By using this composition, it is possible to produce a metal boride sintered body having high density and high hardness without adding a sintering auxiliary or carbon and using a very high pressure.

REFERENCES:
patent: 4439382 (1984-03-01), Joo et al.
patent: 4500643 (1985-02-01), Gesing et al.
patent: 4693989 (1987-09-01), Sane
patent: 4812425 (1989-03-01), Walker, Jr.
Baumgartner, "Sintering and Property of TiB.sub.2 Made from Powder Synthesized in a Plasma-Arc Heater", J. Am. Ceram. Soc., vol. 67, p. 207 (1984).
Hayami et al, "Effects of Applied Pressure on Hot-Pressing of ZrB.sub.2 ", Yogyo-Kyokai-shi, 88[8]1978, pp. 352-359.
Watanabe et al, "Densification Mechanism of TiB.sub.2 -1% CoB and TiB.sub.2 -5% TaB.sub.2 -1% CoB.sub.2 Systems", J. Jap. Soc. Powder and Powder Metallurgy, vol. 33, p. 38 (1986).
Kalisch et al., "Strength, Fracture Mode, and Thermal Stress Resistance of HfB.sub.2 and ZrB.sub.2 ", J. Am. Ceram. Soc., vol. 52, pp. 30-36 (1969).

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