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

1994-03-29

1995-12-26

Nakarani, D. S.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

423344, 423406, 428404, 501 97, B32B 516, C01B 2106

Patent

active

054786495

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. According 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.

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Tokyo Shibaura Denki KK, Abstract of JP-59-050006, "Alpha-type silicon nitride powder production by reduction and . . . ", Mar., 1984.
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Shinetsu Chem Ind KK, Abstract of JP-3-199167, "Treating silicon nitride powder for good slurry properties-comprising heat . . . ", Aug. 1991.

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