Light-transmissive polycrystalline alumina ceramics

Details Light-transmissive polycrystalline alumina ceramics Light-transmissive polycrystalline alumina ceramics

1993-12-30

1994-12-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

501127, 264 65, 264 66, C04B 3510

Patent

active

053766067

ABSTRACT:
A light-transmissive alumina ceramic composition and a method for preparing the same are disclosed. The light-transmissive polycrystalline alumina ceramics composition comprises of 100 w/o of aluminum oxide having a purity of not less than 99.99%, approximately 0.03 to approximately 0.1 w/o of magnesium compound and approximately 0.002 to approximately 0.07 w/o of zirconium compound. The method is comprised of the steps of: molding mixture powder consisting of 100 w/o of aluminum oxide powder having a purity of not less than 99.99% added with from approximately 0.03 to approximately 0.1 w/o of magnesium oxide powder and from approximately 0.002 to approximately 0.07 w/o of zirconium oxide powder to obtain a molded substance; calcining said molded substance under the atmosphere to give a calcined substance having a strength suitable to processing; grinding the surface of said calcined substance smoothly; and sintering the resulting substance in a hydrogen atmosphere or a vacuum. The light-transmissive polycrystalline ceramics composition is preventive of the reflection and scattering of light. With the method for producing light-transmissive polycrystalline ceramics, the workability and the production yield are improved.

REFERENCES:
patent: 4222978 (1980-09-01), Oda et al.
patent: 4285732 (1981-08-01), Charles et al.
patent: 4725467 (1988-02-01), Groh et al.
patent: 4762655 (1988-08-01), Rhodes et al.

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