Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1996-08-20
1997-11-04
Czaja, Donald E.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 175, 264 60, 264 62, 264 65, 501103, 501105, C03B 1901, C03B 1909, C04B 3334, C04B 3336
Patent
active
056834810
ABSTRACT:
An alumina ceramic article and a method for preparing the article. The method comprises the steps of:
(1) Compacting a mixture of a first concentration of particulate aluminum oxide sufficient to prevent retention of the zirconium oxide alloy particles in the shell in a predominantly tetragonal crystal structure and a second concentration of particulate zirconium oxide alloy. The zirconium oxide alloy is zirconium oxide and a secondary oxide selected from the group consisting of MgO, CaO, Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, CeO.sub.2, and rare earth oxides having a concentration of secondary oxide generally of about 0.5 to about 5 mole percent Y.sub.2 O.sub.3, from about 0.1 to about 1 mole percent MgO, from about 0.5 to about 15 mole percent CeO.sub.2, from about 0.5 to about 7.0 mole percent Sc.sub.2 O.sub.3, or from about 0.5 to about 5 mole percent CaO, relative to the total of the zirconium oxide alloy. The compacting results in the formation of a blank.
(2) Providing contact between the blank and a dopant oxide.
(3) Sintering the blank in contact with the dopant oxide wherein said first concentration is from 50-75 weight percent of the total of the first and second concentrations.
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Introduction to Ceramics, Kingery et al, p. 64 1976.
Chatterjee Dilip K.
Ghosh Syamal K.
Jarrold Gregory S.
Czaja Donald E.
Eastman Kodak Company
Rosenstein Arthur H.
Ruller Jacqueline A.
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