Liquid phase sintering of silicon carbide

Details Liquid phase sintering of silicon carbide Liquid phase sintering of silicon carbide

1988-04-21

1989-05-09

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

264 56, 264 65, C04B 3556

Patent

active

048290270

ABSTRACT:
Liquid phase sintering is used to densify silicon carbide based ceramics using a compound comprising a rare earth oxide and aluminum oxide to form liquids at temperatures in excess of 1600.degree. C. The resulting sintered ceramic body has a density greater than 95% of its theoretical density and hardness in excess of 23 GPa. Boron and carbon are not needed to promote densification and silicon carbide powder with an average particle size of greater than one micron can be densified via the liquid phase process. The sintered ceramic bodies made by the present invention are fine grained and have secondary phases resulting from the liquid phase.

REFERENCES:
patent: 4097293 (1978-06-01), Komeya
patent: 4141740 (1979-02-01), Cutler
patent: 4146379 (1979-03-01), Copley
patent: 4158687 (1979-06-01), Yajima
patent: 4341533 (1982-07-01), Daire
patent: 4502983 (1985-03-01), Omori et al.
patent: 4569922 (1986-02-01), Suzuki
patent: 4581295 (1986-04-01), Deliso
Metallurgical and Chemical Engineering, Mar. 1912, pp. 129-132.

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