Process for production of silicon nitride sintered material

Details Process for production of silicon nitride sintered material Process for production of silicon nitride sintered material

1997-06-19

1998-11-10

Chin, Peter

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Producing silicon nitride containing product

501 972, 501 973, C03B 1502, C04B 3558

Patent

active

058339175

ABSTRACT:
In a process for producing a silicon nitride sintered material, a silicon nitride raw material powder selected from raw material powder lots such that the silicon nitride raw material powder has a dispersion .delta.N.beta..sub.1 of weight fraction of .beta.-silicon nitride, of 65% or less, is used. A process for producing a silicon nitride sintered material controls the firing conditions so that the raw material being fired gives, at any stage of firing, a dispersion .delta.N.beta..sub.2 of weight fraction of .beta.-silicon nitride, of 65% or less between the surface portion and the central portion. The first process allows for production of a silicon nitride sintered material having excellent properties in high-temperature strength, etc., at a high reproducibility and stability. The second process allows for production, of in any production batch, a silicon nitride sintered material very low in scattering of properties (e.g., density and strength) between the central portion and the surface portion.

REFERENCES:
patent: 5017531 (1991-05-01), Ukai et al.
patent: 5049530 (1991-09-01), Huckabee et al.
patent: 5394015 (1995-02-01), Tsuzuki et al.
patent: 5411923 (1995-05-01), Suzuki et al.

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