Silicon nitride powder and method for producing the same

Details Silicon nitride powder and method for producing the same Silicon nitride powder and method for producing the same

1995-05-04

1998-02-10

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

427215, 427399, 423344, B05D 700

Patent

active

057166706

ABSTRACT:
The invention relates to material silicon nitride powder used for production of silicon nitride ceramics products. Provided herein is a material powder which can offer a compact having a homogeneous packing structure of the powder with good reproducibility and also to provide a method for producing the same. Accordingly to the method, a silicon nitride powder is heat treated in two-stage processing, one stage in an inert gas or reducing atmosphere at 100.degree. C.-1000.degree. C. for 5-600 min., and another stage in an oxidizing atmosphere at 300.degree. C.-1200.degree. C. for 5-600 min. As a result of this treatment, a silicon nitride powder is obtained in which its powder particles are crystalline in their interior and are coated with an amorphous layer having a 1-10 nm surface thickness and composed mainly of Si, N, O, and H, an atomic number ratio of oxygen to nitrogen (O/N) of the surface layer being within a range of 0.1-2.0.

REFERENCES:
patent: 5030434 (1991-07-01), Pitzer et al.
patent: 5248490 (1993-09-01), Krause

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