Heating – Processes of heating or heater operation – Including preparing or arranging work for heating
Patent
1988-07-22
1989-07-11
Yuen, Henry C.
Heating
Processes of heating or heater operation
Including preparing or arranging work for heating
432 6, 432253, F27D 500
Patent
active
048466735
ABSTRACT:
A process for preparing a heat-resistant composite body, comprising forming silicon carbide crystal powder into a molded product, sintering the molded product in a non-oxidizing atmosphere, and thereafter filling with metallic silicon the inside of permeable voids of said porous body obtained by sintering. Powder having an average particle diameter of 5 .mu.m or less is used as said silicon carbide crystals to form it into secondary particles having an average particle diameter of from 40 to 150 .mu.m and such a particle size distribution that 60% by weight or more of particles are included in .+-.20% of the average particle diameter. This is followed by pressure molding to form a molded product using a molding pressure such that said granular secondary particles collapse at their surface areas to mutually bond there and at the same time the insides thereof remain uncollapsed, and also the molded product may have a bulk specific density of from 1.1 to 2.0 g/cm.sup.3. The molded product is heated to a temperature of from 1,400.degree. to 2,100.degree. C. to carry out sintering in a non-oxidizing atmosphere. Thereafter the inside of the resulting sintered body is filled with metallic silicon in an amount of from 45 to 140 parts by weight based on 100 parts by weight of the silicon carbide.
REFERENCES:
patent: 3951587 (1976-04-01), Alliegro et al.
patent: 4761134 (1988-08-01), Foster
Ibiden Co. Ltd.
Yuen Henry C.
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