Process of forming silicon carbide bodies

Details Process of forming silicon carbide bodies Process of forming silicon carbide bodies

1976-12-30

1978-11-28

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 44, 264 86, 264221, 264317, C04B 3556

Patent

active

041276299

ABSTRACT:
A castable slip of a bimodal distribution of silicon carbide particles is prepared, the slip preferably containing a water miscible curable resin. A shaped body is cast in a plaster of paris mold which also preferably contains a small amount of a water soluble polymer. The casting and mold are then heat treated to increase the strength of the green casting. In a preferred embodiment of the invention the resin in the slip is cured by the heat treating step. The mold is then removed by decomposing the mold material, preferably by dipping the mold in acid to attack the mold material (e.g. the water soluble polymer or the plaster of paris itself). The cured resin in the casting is sufficiently resistant to attack by the acid to survive the mold removal. In an alternative embodiment the silicon carbide body is heated to a sufficiently high temperature (e.g. 650.degree.-750.degree. C) to slightly oxidize the SiC and to strengthen the green casting. Along with this heating the water soluble polymer in the mold is burned out and the mold is thereby weakened to permit its ready removal. Thereafter, the cast silicon carbide product is fired to carbonize any resin in the SiC and recrystallize the silicon carbide. The product is then preferably siliconized to react all of the carbon remaining from the resin and any additional carbon that may be added after recrystallization of the silicon carbide.

REFERENCES:
patent: 2303303 (1942-11-01), Schliecher
patent: 2527390 (1950-10-01), Blaha
patent: 2964823 (1960-12-01), Fredrickson
patent: 3383444 (1968-05-01), Loyet
patent: 3549473 (1970-12-01), Le Blanc
patent: 3673293 (1972-06-01), Teague
patent: 4017433 (1977-04-01), Farrington et al.
patent: 4041117 (1977-08-01), Prochazka

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