Compositions: ceramic – Ceramic compositions – Aluminum compound containing
Patent
1988-07-22
1991-02-26
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Aluminum compound containing
501127, 428114, C04B 3510
Patent
active
049961772
ABSTRACT:
A sintered alumina article having an excellent flexural strength comprises numerous sintered plate crystalline corundum particles each having cleavage surface planes and accumulated on and bonded to each other in a manner such that the cleavage surface planes of the accumulated plate crystalline particles are substantially in parallel to each other and can be produced by forming the plate crystalline corundum particles into a predetermined shape so that the plate crystalline particles are accumulated in the above-mentioned manner; and by sintering the resultant precursory article at 1500.degree. C. or more under the ambient atmospheric pressure.
REFERENCES:
patent: 2642337 (1953-06-01), Newsome
patent: 3740243 (1971-06-01), Kappes et al.
Yanaagide et al.; "A Discussion on the Phase Diagram of the System Al.sub.2 O.sub.3 -H.sub.2 O Considering the Transformation Mechanism of the Polymorphs Appearing in It" J. Ceram. Assoc. Japan, vol. 14(3) pp. 36-41, 1966.
Journal of Physical Chemistry, vol. 67, pp. 835-839, 1963 "The Solubility of Corundum in Basic Hydrothermal Solvents".
Kuboto Yoshifumi
Oku Takashi
Shigeru Keijiro
Shishikura Tsutomu
Takagi Shigehide
Bonner C. Melissa
Dixon Jr. William R.
Sumitomo Cement Co. Ltd.
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