Method of producing a ceramic product

Details Method of producing a ceramic product Method of producing a ceramic product

C - Chemistry, Metallurgy

04

B

261/1, 261/38

C04B 35/18 (2006.01) C04B 35/597 (2006.01) C04B 35/64 (2006.01)

Patent

CA 1081717

ABSTRACT OF DISCLOSURE. A method of producing a ceramic product comprises the step of forming a powder mixture consisting essentially of a first component consisting of compounds containing the elements, silicon, aluminium, oxygen and nitrogen in proportions such that the ratio of the total number of silicon and aluminium atoms to the total number of oxygen and nitrogen atoms lies in the range 0.735 to 0.77 and such that said compounds react together during the subsequent sintering process to produce a single phase ceramic material obeying the general formula:- Si6z Alz Oz N8-z where z is between 0.38 and 1.5 and between 0.1 and 10% by weight of a second component in the form of an oxide of at least one of the further elements yttrium, scandium, cerium, lanthanum and the metals of the lanthanide series. The mixture is then sintered in a protective environment at a temperature between 1600°C and 2000°C and for a time, decreasing with increasing temperature, of at least 10 minutes to at least 5 hours so as to produce a ceramic material containing at least 80% by volume of said single phase ceramic material together with a second phase containing said at least one further element.

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