Furnace for sintering ceramics, carbon heater used therefor and

Details Furnace for sintering ceramics, carbon heater used therefor and Furnace for sintering ceramics, carbon heater used therefor and

1988-04-11

1990-03-27

Walberg, Teresa J.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

501 99, 219553, H05B 342

Patent

active

049123025

ABSTRACT:
A furnace for sintering non-oxide ceramics, particularly Si.sub.3 N.sub.4, which includes a space for accommodating a ceramic shaped body, carbon heaters arranged around the ceramic shaped body in said space and heat insulating layers of carbon fiber mat that cover the inner walls of the furnace. The furnace also includes sheets composed of laminated graphite leaves having an ash content of not more than 0.3% by weight extendedly provided between the heat insulating layers and the ceramic shaped body. As the carbon heaters, those composed of a high purity graphite having a carbon content of at least 99.9980%, a silicon content of not more than 5 ppm and an iron content of not more than 9 ppm, by weight, are preferably used. A process is also disclosed which utilizes the above apparatuses to protect the shaped body from an influence of carbon fiber dusts liberating from the insulating layers during sintering.

REFERENCES:
patent: 3079266 (1963-02-01), Galy
patent: 3171720 (1965-03-01), Shea
patent: 4080509 (1978-03-01), Greenewald
patent: 4117252 (1978-09-01), McMaster
patent: 4325694 (1982-04-01), Bergman
patent: 4347431 (1982-08-01), Pearce
patent: 4647356 (1987-03-01), Leroy

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