Ceramic porous body and method for preparing the same

Details Ceramic porous body and method for preparing the same Ceramic porous body and method for preparing the same

1995-09-21

1997-12-09

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 80, 501 87, 501 92, 501 971, 501 972, 501 973, 501 974, 264 43, 264 65, C04B 3800, C04B 35584

Patent

active

056960425

ABSTRACT:
A ceramic porous body for a filter or a catalyst carrier, having a structure in which voids each having the same volume as that of a sphere of 10 .mu.m to 500 .mu.m in diameter are formed and the voids are communicated with each other through smaller fine pores, the ceramic porous body having a volume fraction of the voids and the fine pores of from 15% to 60% and being formed of components 70% or higher by volume of which is silicon nitride. The ceramic porous body is prepared by mixing coarse silicon nitride powder with fine silicon nitride powder(s) at a mixing ratio by volume of the fine silicon nitride powder to the combined volume of the fine and coarse silicon nitride powders in the range of 1/99 to 1/2; adding one or more compounds of the group IIa elements, the group IIIa elements, transition metals, Al and Si in a range of 1% to 30% by volume as their oxides to the silicon nitride powder mixture; molding the resultant powder mixture; and sintering the molded body in a non-oxidizing atmosphere of at least 0.9 atm at a temperature ranging from 1100.degree. C. to 2000.degree. C.

REFERENCES:
patent: 4043823 (1977-08-01), Washburn et al.
patent: 4629707 (1986-12-01), Wolfe
patent: 4650592 (1987-03-01), Dobbs et al.
patent: 4777152 (1988-10-01), Tsukada
patent: 5200373 (1993-04-01), Yasutomi et al.

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