Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1995-05-02
1998-07-14
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
501153, C04B 3510, C04B 3550, C04B 35645
Patent
active
057803773
ABSTRACT:
Light-transmissive ceramics are disclosed composed of a plurality of oxides each having a negative standard Gibbs energy of formation (.DELTA.Gf.sup.0) with an absolute value greater than 1581.9 KJ/mol. The light-transmissive ceramics are produced by subjecting the oxides to hot isostatic pressing at a high temperature under a high pressure after they have been subjected to primary sintering. The light-transmissive ceramics of Al.sub.2 O.sub.3 /La.sub.2 O.sub.3 are of a composite structure with particles of La.sub.2 O.sub.3 being present between particles of Al.sub.2 O.sub.3, rather than Al.sub.2 O.sub.3 and La.sub.2 O.sub.3 forming a solid solution. In the composite structure, the particles of La.sub.2 O.sub.3 have sizes that are 1/3 to 1/30 of the particles of Al.sub.2 O.sub.3. Maximum size particles of Al.sub.2 O.sub.3 have a longer axis of 30 .mu.m or less and a shorter axis of 20 .mu.m or less, and maximum size particles of La.sub.2 O.sub.3 or the like have a longer axis of 10 .mu.m or less and a shorter axis of 5 .mu.m or less. Before an a molded ceramics body is fully fired, it may be processed by a chelating agent, and perhaps also with hydrofluoric acid, to remove impurities therefrom for improving characteristics of the light-transmissive ceramics.
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Bundo Tetsuaki
Hayashi Koichi
Wajima Naohito
Bell Mark L.
Carrier Joseph P.
Toto Ltd.
Troilo Louis M.
Weiner Irving M.
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