Polycrystalline alumina material

Details Polycrystalline alumina material Polycrystalline alumina material

C - Chemistry, Metallurgy

01

F

23/240, 261/38,

C01F 7/02 (2006.01) C04B 35/10 (2006.01) C04B 35/44 (2006.01)

Patent

CA 1095690

LD 7426 ABSTRACT OF THE DISCLOSURE Increased optical transmission is provided for a body of light-transmissive polycrystalline alumina. The body of alumina has relatively uniform size equiaxed grains of alumina, and is essentially free of porosity and secondary phase material. A tube of the improved optical material can be used as the light-transmissive envelope for high-intensity discharge lamps, especially sodium vapor lamps and other metal-vapor lamps. Such lamps exhibit increased light output as a result of the increased optical transmission. A method of producing the imnproved optical material is also disclosed.

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