Process for the production of silicon carbide sintered bodies

Details Process for the production of silicon carbide sintered bodies Process for the production of silicon carbide sintered bodies

1982-02-26

1985-07-02

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

264 28, C04B 3534

Patent

active

045267340

ABSTRACT:
A process for producing a silicon carbide sintered body is disclosed, which comprises the steps of charging a sintering raw material consisting mainly of silicon carbide fine powder and sintering aid into a dispersion medium together with, if necessary, at least one substance of a molding assistant and a deflocculating agent to form such a uniform suspension that a volume ratio of solid content composed of said silicon carbide fine powder and sintering aid in said suspension is not more than 15%; spray freezing said suspension in an atmosphere held at a temperature lower than a melting point of said dispersion medium to obtain a granular frozen body; freeze drying said granular frozen body for sublimation of said dispersion medium to obtain a powdery dried mixture; shaping said powdery dried mixture into a green body of an optional form; and sintering said green body without pressing.

REFERENCES:
patent: 2893102 (1959-07-01), Maxwell
patent: 3171870 (1965-03-01), Monteil
patent: 3516935 (1970-06-01), Monforte
patent: 4004934 (1977-01-01), Prochazka
patent: 4041117 (1977-08-01), Prochazka

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