Method of preparing near-net shape silicon nitride articles...

Details Method of preparing near-net shape silicon nitride articles... Method of preparing near-net shape silicon nitride articles...

B - Operations, Transporting

28

B

B28B 3/00 (2006.01) C04B 35/593 (2006.01) C04B 35/645 (2006.01)

Patent

CA 2051248

ABSTRACT Use a material that has a coefficient of thermal expansion greater than that of silicon nitride and does not react with silicon nitride under hot pressing conditions (a) to fabricate or (b) to coat hot- pressing die plates suitable for densifying silicon nitride. The die plates separate cleanly from hot- pressed silicon nitride. The clean separation allows preparation of near-net shapes having complex geometries without post densification grinding or machining. 39,072-F

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