Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold...
Patent
1992-07-24
1995-01-31
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
264 69, 264 71, 264 87, C04B 3328, C04B 3358
Patent
active
053857011
ABSTRACT:
Disclosed herein are a method for molding a high density and homogeneous silicon nitride ceramics within a short time and an apparatus used for the method. A gel-like slurry mixture which is a mixture of ceramic powders consisting mainly of Si.sub.3 N.sub.4 and a liquid and has a powder content of from 45 vol % to 60 vol % is fluidized by imparting thereto a strain by vibration, and the mixture under the fluidized state is filled into, and molded by, a mold. Preferably, the entire part or a part of the mold is made of a liquid permeable material. The vibration preferably has an acceleration of from 0.1 G to 150 G and an amplitude of 1 .mu.m to 1 cm. Furthermore, the viscosity of the slurry filled into the mold is preferably from 2,000 to 20,000 cps.
REFERENCES:
patent: 2897572 (1959-08-01), Hansen
Bell, Vibratory Compacting of Metal and Ceramic Powders, WADC Tech. Report 53-193, part 3, Mar. 1956 U.S. Dept. of Commerce p. iii and p. 42.
Abstract of DE 4037258.
Chemical Abstracts, vol. 94, No. 8, Abstract No. 51450V D. B. Goel, et al; Effect of Bibration . . . Aluminum Alloy.
Patent Abstracts of Japan JPA-60-070,101; Apr. 20, 1985.
Awazu Tomoyuki
Komura Osamu
Tsuzuki Yasushi
Yamakawa Akira
Bierman Jordan B.
Derrington James
Sumitomo Electric Industries Ltd.
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