Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Utilizing sol or gel
Patent
1996-08-07
1998-08-18
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Utilizing sol or gel
264642, 264655, 264658, 264661, 264678, C04B 35622
Patent
active
057955379
ABSTRACT:
The present invention provides a method of producing composite oxide ceramics which is capable of efficiently producing single-phase multi-component metal oxide ceramics having less impurity phase and excellent dielectric characteristics, by a simple process comprising sintering at a low temperature. The method has the steps of mixing a metallic hydroxide or hydrous gel with a plurality of metallic oxide powders to prepare a raw material mixture powder, activating the raw material mixture powder by mechanochemical treatment for grinding the raw material mixture powder with a degree of impact, which provides a centrifugal effect of 15 or more, to form a precursor, and synthesizing composite oxide ceramics by heat treatment of the activated raw material mixture powder (precursor).
REFERENCES:
patent: 4946810 (1990-08-01), Heistand
patent: 5096642 (1992-03-01), Shirasaki
Chemical Engineer's Handbook, Robert H. Perry, McGraw-Hill Book Co., New York, 1973, pp. 8-43, 44.
Cho Sang-Hee
Hamada Kenji
Senna Mamoru
Derrington James
Nara Machinery Co., Ltd.
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