Method for manufacturing a sintered body of silicon nitride

Details Method for manufacturing a sintered body of silicon nitride Method for manufacturing a sintered body of silicon nitride

1988-04-29

1990-11-20

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 63, 264344, 419 13, 419 40, C04B 3564

Patent

active

049717405

ABSTRACT:
A method for manufacturing a sintered body is provided, comprising the steps of dispersing powdery silicon nitride and a sintering assistant into a first dispersion medium composed mainly of substance capable of being extracted by supercritical fluid to form a first slurry and casting the first slurry to form a compact; dispersing powdery material into a second medium composed mainly of substance capable of being extracted by the supercritical fluid to form a second slurry and coating the second slurry on the surface of the compact to form a film layer; dipping the compact covered with the film layer in the supercritical fluid to extract the first dispersion medium and the second dispersion medium, respectively from the compact and the film layer; heating the compact from which the first and second dispersion mediums have been removed to form the film layer into a film layer impermeable to gas; and sintering the compact covered with the film layer impermeable.

REFERENCES:
patent: 4112143 (1978-09-01), Adlerborn et al.
patent: 4622186 (1986-11-01), Mizutani
patent: 4643858 (1987-02-01), Mizutani
patent: 4737332 (1988-04-01), Miyashita et al.
patent: 4820462 (1989-04-01), Nakajima et al.
patent: 4843043 (1988-03-01), Nishio

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