Method of preparing silicon nitride porous body

Details Method of preparing silicon nitride porous body Method of preparing silicon nitride porous body

1996-07-26

1998-12-08

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 42, 264628, 264344, C04B 3804

Patent

active

058464603

ABSTRACT:
A silicon nitride ceramic porous body having excellent acid and alkali resistance, mechanical strength, and durability can be employed as a filter or a catalytic carrier. The silicon nitride porous body contains a plurality of silicon nitride crystal grains with pores formed in grain boundary parts thereof, or includes a body part and a pore part wherein the body part is formed by a plurality of silicon nitride crystal grains and the pore part forms a three-dimensional network structure. The body part is formed by at least 90 vol. % of silicon nitride crystal grains, which are directly bonded to each other. In order to prepare the finished ceramic porous body, a porous body compact which is mainly composed of silicon nitride, is brought into contact with an acid and/or an alkali so that a component other than silicon nitride is partially or entirely dissolved and removed from the compact. The compact is prepared from a mixed powder of silicon nitride powder and at least one of a rare earth compound powder, a transition metal compound powder, and a bismuth compound, which is heat treated in the temperature range from 1600.degree. C. to 2100.degree. C.

REFERENCES:
patent: 4146379 (1979-03-01), Copley
patent: 4177235 (1979-12-01), Neidhardt
patent: 4623498 (1986-11-01), Beckwith
patent: 5376602 (1994-12-01), Nilsen

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