Pressureless sintering silicon nitride powders

Details Pressureless sintering silicon nitride powders Pressureless sintering silicon nitride powders

1974-07-25

1976-11-16

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

106 735, 264 66, C04B 3332, C04B 3558

Patent

active

039924971

ABSTRACT:
A method of producing a silicon nitride article by powder techniques, wherein silicon nitride powder is used as a starting material. The silicon nitride powder, mixed with a densification aid, is heated rapidly to the sintering/densification temperature (1500.degree. to 1750.degree. C) in the absence of pressure, held there a short, closely controlled time (5 to 30 minutes) and thereafter rapidly cooled. This provides a strong product with controlled dimensional tolerances.

REFERENCES:
patent: 3035235 (1962-05-01), Nicholsen et al.
patent: 3468992 (1969-09-01), Labatti

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