Method of forming high density beta silicon nitride

Details Method of forming high density beta silicon nitride Method of forming high density beta silicon nitride

C - Chemistry, Metallurgy

04

B

25/133

C04B 35/58 (2006.01) C04B 35/593 (2006.01)

Patent

CA 1092325

ABSTRACT OF THE DISCLOSURE A method of fabricating essentially fully densified .beta.-silicon nitride articles by placing .alpha.-silicon nitride in a mold, heating the .alpha.-silicon nitride to a temperature sufficient to bring about conversion to silken nitride, applying a small but insufficient amount of pressure to cause full densification, holding these temperature and pressure conditions until essentially all of the .alpha.-silicon nitride has been converted to the .beta. form, and finally, increasing the temperature and pressure sufficiently to bring about full densification of the .beta.-silicon nitride.

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