Method of making porous silicon carbide bodies

Details Method of making porous silicon carbide bodies Method of making porous silicon carbide bodies

1985-06-10

1986-01-14

Cooper, Jack

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 49, 264 66, 264 82, 264129, 423345, 423346, 501 88, 501 90, C01B 3136

Patent

active

045644969

ABSTRACT:
Porous silicon carbide bodies are obtained by starting with a powder of particle size falling within a single sieve mesh range fraction and consisting either entirely of carbon particles or a mixture of carbon and silicon carbide particles of the same mesh fraction is mixed or coated with 15 to 30% by weight of a binder, moulded to shape, warmed in the temperature range from 40.degree. to 200.degree. C. to vaporize volatile material and then coked at a temperature rising to 850.degree. C. Then it is siliconized by raising the temperature to the range from 1650.degree. to 1950.degree. C. with gaseous silicon or impregnated with silicon by dipping the body into a silicon melt and convert it to carbide, with the excess silicon thereafter being removed by vaporizing out or by boiling in lye. Sieve mesh fractions in the region of a few hundred .mu.m are preferred, and the density of the porous body after pressing but before siliconizing should lie in the neighborhood of 0.6 to 0.7 g/cm.sup.3.

REFERENCES:
patent: 2691605 (1954-10-01), Hediger
patent: 3100688 (1983-08-01), Dess
patent: 3205043 (1965-09-01), Taylor
patent: 3436793 (1970-10-01), Norman
patent: 4067955 (1978-01-01), Noakes
patent: 4301132 (1981-11-01), Kennedy
patent: 4415632 (1983-11-01), Luhleich
Singer Text, pp. 521-522, (Industrial Ceramics).

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