Compositions: ceramic – Ceramic compositions – Refractory
Patent
1996-12-30
1998-07-14
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 80, 501 972, 264628, 264676, 264683, C04B 35584
Patent
active
057803749
ABSTRACT:
A high-porosity and high-strength porous silicon nitride body comprises columnar silicon nitride grains and an oxide bond phase containing 2 to 15 wt. %, in terms of oxide based on silicon nitride, of at least one rare earth element, and has an SiO.sub.2 /(SiO.sub.2 +rare earth element oxide) weight ratio of 0.012 to 0.65 and an average pore size of at most 3.5 .mu.m. The porous silicon nitride body is produced by compacting comprising a silicon nitride powder, 2 to 15 wt. %, in terms of oxide based on silicon nitride, of at least one rare earth element, and an organic binder while controlling the oxygen content and carbon content of said compact; and sintering said compact in an atmosphere comprising nitrogen at 1,650.degree. to 2,200.degree. C. to obtain a porous body having a three-dimensionally entangled structure made up of columnar silicon nitride grains and an oxide bond phase, and having an SiO.sub.2 /(SiO.sub.2 +rare earth element oxide) weight ratio of 0.012 to 0.65.
REFERENCES:
patent: 4629707 (1986-12-01), Wolfe
patent: 5004709 (1991-04-01), Stranford et al.
patent: 5618765 (1997-04-01), Takeuchi et al.
Kawai Chihiro
Matsuura Takahiro
Yamakawa Akira
Group Karl
Sumitomo Electric Industries Ltd.
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