Korea Institute of Science and Technology

Dong K Lim

Yoon H Kim

Hee Bum Kang

Jae K Park

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.

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Kyungki-Do, South Korea

Dong K Lim