Process for making a homogeneous doped silicon nitride article

Details Process for making a homogeneous doped silicon nitride article Process for making a homogeneous doped silicon nitride article

C - Chemistry, Metallurgy

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C04B 35/58 (2006.01) C01B 21/068 (2006.01) C04B 35/584 (2006.01) C04B 35/628 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01)

Patent

CA 1273185

PROCESS FOR MAKING A HOMOGENEOUS DOPED SILICON NITRIDE ARTICLE Abstract A process for making a homogeneous yttria-alumina doped silicon nitride article is described. A uniform coating of yttria and alumina is applied to the surface of silicon nitride particles by a chemical application of the hydroxides of yttrium and aluminum followed by drying and a subsequent convertion of the hydroxides to the corresponding oxides. The resulting powder is formed into an article and pressureless sintered to a density greater than 99% of theoretical.

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