Method of making a translucent polycrystalline alumina

Details Method of making a translucent polycrystalline alumina Method of making a translucent polycrystalline alumina

1996-09-24

1997-05-06

Group, Karl

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonresinous material only

501119, 501127, 501153, 501152, 264 65, 264 66, 264910, C04B 35115

Patent

active

056271166

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.

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