Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1995-06-16
1996-12-24
Group, Karl
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
501119, 501127, 501153, C04B 35115
Patent
active
055873464
ABSTRACT:
A sintered, translucent ceramic article comprises alpha alumina and up to 0.050 wgt. percent magnesia and between 0.001 to 0.100 wgt. percent lutetium oxide. In a preferred embodiment, the lutetium oxide is at 0.050 wgt. percent and in a second preferred embodiment half the lutetium oxide is replaced by yttrium oxide. A method of making a translucent ceramic article comprises the steps of: forming an aqueous slurry to yield one of the composition described above; adding nitric acid to adjust the pH to 4.6; adding an aqueous binder and plasticizer in the amount of 2.5 solids wgt. percent; spray-drying the slurry; forming an article by wet-bag isopressing; prefiring said article in air at about 1325.degree. C. for about 2 hours; and sintering said air-fired article in hydrogen for about 3 hours at 1800.degree. C.
REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 4285732 (1981-08-01), Charles et al.
patent: 4902654 (1990-02-01), Aubert et al.
patent: 5001093 (1991-03-01), Roy et al.
patent: 5244849 (1993-09-01), Roy et al.
patent: 5376606 (1994-12-01), Kim et al.
patent: 5382556 (1995-01-01), Takahashi et al.
Group Karl
McNeill William H.
Osram Sylvania Inc.
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