Process for producing moldings from silicon-infiltrated silicon

Details Process for producing moldings from silicon-infiltrated silicon Process for producing moldings from silicon-infiltrated silicon

1993-02-17

1994-06-28

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 90, 164 97, 164 98, 264 57, 264 65, C04B 3565

Patent

active

053246926

ABSTRACT:
For silicizing porous moldings of silicon carbide/carbon, a mixture of silicon carbide powder, organic binder and, if appropriate, carbon is molded to give a green compact, the binder of the green compact is removed by carbonization at about 1000.degree. C. in a non-oxidizing atmosphere and the resulting blank is silicized by the action of molten silicon, while the resulting blank rests on a porous SiSiC carrier, whose lower part is in contact with the molten silicon. The carrier used may be a close packing of porous SiSiC rings which are arranged mutually parallel and perpendicularly on a graphite firing plate which is charged with silicon and is impermeable to molten silicon; or the carrier may be plane having a plurality of recess; or the carrier may have a straight channel with an angular cross section and recesses, into which the blank to be silicized is placed, wherein the SiSiC carrier has downward protruding side walls, whose undersides are in contact with the molten silicon.

REFERENCES:
patent: 3495939 (1970-02-01), Forrest
patent: 4154787 (1979-05-01), Brown
patent: 4265843 (1981-05-01), Dias et al.
patent: 4564496 (1986-01-01), Gupta et al.
patent: 4572848 (1986-02-01), Pollak et al.
patent: 4626516 (1986-12-01), Morelock
patent: 5079195 (1992-01-01), Chiang et al.
Chemical Abstract, vol. 110, (1989), p. 332, 198040u.

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