Dense sic ceramic products

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C - Chemistry, Metallurgy

04

B

C04B 35/565 (2006.01) C04B 35/64 (2006.01) C04B 35/653 (2006.01)

Patent

CA 2071522

A process for the liquid phase sintering of silicon carbide, comprising forming a shaped, consolidated powder body which, not allowing for binder, comprises a powder mixture containing at least 75 wt % silicon carbide and from 1 to 25 wt % (calculated as Al2O3) of a powder comprising a source of aluminium selected from alumina, precursors for alumina and mixtures there- of. The body is heated in a non-oxidising atmosphere to a sintering temperature of from 1500°C to 2300°C to form a liquid phase and a resultant liquid phase sintered body. In said heating step, the body is heated in the presence of a source of mag- nesium which is distinct from the source of aluminium and comprises at least one of magnesia, precursors for magnesia, magnesium vapour and combinations thereof, whereby said liquid phase produces secondary oxide constituent.

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