Method of making silicon nitride comprising objects

Details Method of making silicon nitride comprising objects Method of making silicon nitride comprising objects

C - Chemistry, Metallurgy

04

B

25/128

C04B 41/00 (2006.01) C04B 35/593 (2006.01) C04B 35/645 (2006.01)

Patent

CA 1247333

-12- ABSTRACT A method of making a heat fused silicon nitride comprising object is disclosed. A series of measured powder shots are containerized to be carried in the container between the nitriding and heat fusing steps. The containerization comprises lining the internal wall of a graphitic sleeve, treated for inertness, with a refractory metal foil essentially impervious to migration of carbon ions and having a thickness of .2 inches or less. A series of measured shots, of a powder mixture of silicon and oxygen carrying agents, is inserted into the assembly, each shot being separated by an inert spacer. The assembly is subjected to a nitriding treatment and subsequently hot pressed/or sintered.

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