Process for preparation of sintered silicon nitride body

Details Process for preparation of sintered silicon nitride body Process for preparation of sintered silicon nitride body

1985-03-05

1987-02-17

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 65, 264570, 428689, 428697, 428698, C04B 3334, C04B 3558

Patent

active

046438580

ABSTRACT:
In preparing a sintered silicon nitride body by hot isostatic pressing, if a green molded body of silicon nitride and a sintering aid is coated with a compound of high melting point cyrstalline powder (sintering aids of silicon nitride), said crystalline compound works as a pressure media on HIP treatment and is present in the surface of the sintered body. By the presence of this crystal, hot isostatic pressing of this dual density compact mentioned above results surface compression stress, which results not only the strength at room temperature but also the strength at high temperatures is highly improved.

REFERENCES:
patent: 4242294 (1980-12-01), Huther et al.
patent: 4310477 (1982-01-01), Uy
patent: 4462817 (1984-07-01), Wolfe

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