Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1995-05-25
1997-12-09
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 42, 264 43, C04B 3334, C04B 3336, C04B 3571, C04B 3700
Patent
active
056957009
ABSTRACT:
A ceramics porous body having high porosity as well as high strength is especially suitable for use as a filter for removing foreign matter from a fluid or as a catalytic carrier. The porous body has a porosity of at least 30% and comprises columnar ceramic grains having an aspect ratio of at least 3. In particular, the porous body comprises Si.sub.3 N.sub.4 grains, of which at least 60% are hexagonal columnar .beta.-Si.sub.3 N.sub.4 grains. The porous body further comprises at least one compound of a rare earth element in an amount of at least 1 volume % and not more than 20 volume % in terms of an oxide of the rare earth element, and optionally at least one compound of elements of the groups IIa and IIIb of the periodic table and transition metal elements in an amount of not more than 5 volume % in terms of an oxide of each element. A compact of mixed powder obtained by adding the compound powder of the rare earth element to silicon nitride powder is heat treated in a nitrogen atmosphere at a temperature of at least 1500.degree. C., to prepare the silicon nitride ceramic porous body.
REFERENCES:
patent: 4332909 (1982-06-01), Nishida et al.
patent: 4629707 (1986-12-01), Wolfe
patent: 5269989 (1993-12-01), Pyzik et al.
JIS R 1601 (English version).
Journal of Ceramic Society of Japan 100(5) 758-762 (1992) Microstructure and Electrical-Properties in a Humid Atmosphere by Susumu Nakayama et al.
Ceramic Transactions, ISSN 1042-1122, vol. 31, Porous Materials (1992).
Kawai Chihiro
Matsuura Takahiro
Nakahata Seiji
Takeuchi Hisao
Czaja Donald E.
Fasse W. F.
Fasse W. G.
Ruller Jacqueline A.
Sumitomo Electric Industries Ltd.
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