Making of sintered silicon carbide bodies

Details Making of sintered silicon carbide bodies Making of sintered silicon carbide bodies

1993-09-20

1995-11-28

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 89, 501 91, 501 93, 264 65, C04B 3556

Patent

active

054708060

ABSTRACT:
Pressureless sintering is used to densify silicon carbide based ceramics using a compound comprising transition metal oxides and aluminum oxide at temperatures in excess of 1850.degree. C. The resulting sintered body has a density greater than 95% of its theoretical density, flexural strength in excess of 560 MPa and fracture toughness of 7.2 MPa.m.sup.1/2. The method consists of sintering and conversion of transition metal oxides into carbides in one step operation. Practically any transition metal oxide can be used. The sintered ceramic bodies made by the present invention consist of silicon carbide matrix phase and Al.sub.2 O.sub.3 and transition metal carbide phases.

REFERENCES:
patent: 4354991 (1982-10-01), Suzuki et al.
patent: 4502983 (1985-03-01), Omuri et al.
patent: 4569921 (1986-02-01), Omuri et al.

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