Method of manufacturing a sintered silicon carbide ceramic part

Details Method of manufacturing a sintered silicon carbide ceramic part Method of manufacturing a sintered silicon carbide ceramic part

1982-05-10

1984-01-03

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 63, C04B 3564

Patent

active

044241798

ABSTRACT:
A method of manufacturing a sintered silicon carbide ceramic part in which is formed a mixture of carbide powder with a sintering additive based on boron, beryllium or aluminium, and an injection moulding additive comprising a mixture of polystyrene and a wax. A moulded part is manufactured by injection moulding and is then baked and is finally sintered.
Polystyrene is used simultaneously as a moulding agent and as a carbonizable substance. When the moulded part is baked it is heated in air to a temperature between 230.degree. C. and 330.degree. C. and is then kept at that temperature for a fairly long time to remove the wax and to reticulate and oxidize the polystyrene.
Application to manufacturing dense sintered parts.

REFERENCES:
patent: 3985846 (1976-10-01), Lundsager et al.
patent: 4124667 (1978-11-01), Coppola et al.
patent: 4233256 (1980-11-01), Ohnsorg
Foster et al., Sintering Carbides by Means of Fugitive Binders, in Journal of the Ceramic Society, vol. 33, No. 1, pp. 27-33, Jan. 1950.

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