Method of heat-treating unstable ceramics by microwave...

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25/128, 252/18

B01J 20/00 (2006.01) B01J 19/12 (2006.01) B30B 11/00 (2006.01) C04B 35/64 (2006.01) C04B 35/645 (2006.01)

Patent

CA 2001062

Abstract: A method of sintering thermally unstable (usually non- oxide) ceramics by microwave heating. In the method, a body of the ceramic is at least partially surrounded with a protective bed of particulate material and then the body and the bed are subjected to microwave irradiation to cause heating and sintering of the body. In order to allow the method to be carried out in an oxygen-containing gas such as air and at low pressure, the bed contains effective amounts of: (a) a microwave susceptor, if the unstable ceramic is not already a susceptor, (b) a protective material capable of generating a localized atmosphere which reduces decomposition and/or oxidation of the unstable ceramic, (c) an oxygen getter and (d) a material of sufficiently good thermal conductivity to prevent excessive localized heating in the bed. The invention also relates to the bed of particulate material used in the method and to a process for joining bodies of unstable ceramics by microwave irradiation using the protective bed.

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