Polycrystalline translucent alumina having an excellent...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/02 (2006.01) C04B 35/115 (2006.01) H01J 61/30 (2006.01)

Patent

CA 1103000

Abstract of the Disclosure Polycrystalline translucent alumina having an average grain size of alumina crystal grain being not smaller than 20 µ and an average surface roughness of the fired body being not larger than 1/10 of the maximum grain size of alumina crystal grain and capable of being used for an envelope of a high pressure vapor discharge lamp, which is produced by shaping alumina composition powders consisting mainly of alumina into a given shape, primarily firing the shaped body under vacuum or in an atmosphere of hydrogen gas or dissociated ammonia gas at a temperature within 1,500°C and then secondarily firing the primarily fired body at a temperature of 1,650-1,900°C, at least the temperature from 1,400°C to 1,700°C being raised at a rate of not lower than 200°C/hr.

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