Ceramic material and method of manufacture

Details Ceramic material and method of manufacture Ceramic material and method of manufacture

C - Chemistry, Metallurgy

04

B

261/1, 25/141

C04B 35/58 (2006.01) C04B 35/597 (2006.01)

Patent

CA 1201131

TITLE OF THE INVENTION CERAMIC MATERIAL AND METHOD OF MANUFACTURE ABSTRACT OF THE DISCLOSURE A dual phase silicon aluminum oxynitride material comprising a first phase Si-Al-O-N, commonly referred to as .beta.-Si-Al-O-N, and a second phase Si-Al-O-N referred to as .alpha.-Si-Al-O-N. In addition to the double phase Si-Al-O-Ns, there is usually included a glassy type material which can formulate up to ten percent by weight of the total composition. The material may be manufac- toward by forming a polytype material made from reacted alumina, aluminum nitride and silicon nitride. The poly- type material may be mixed with further powders of sili- con nitride and an oxide of yttrium, lithium or calcium and finally reacted to a double phase Si-Al-O-N material where hardness is increased with the additional .alpha.-Si-Al-O-N without significantly affecting its strength. The material may be formed in situ by mixing alumi- num nitride, alumina, silicon nitride, together with an oxide of yttrium, lithium or calcium. These materials can then be sintered to a final product containing a double phase Si-Al-O-N. Control of the alumina content in the polytype or in situ methods affects the percent- age of .alpha.-Si-Al-O-N produced in the final product. The hardness of the material increases with the .alpha.-Si-Al-O-N content without significantly affecting its transverse rupture strength.

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