Translucent polycrystalline alumina and method of making same

Details Translucent polycrystalline alumina and method of making same Translucent polycrystalline alumina and method of making same

C - Chemistry, Metallurgy

04

B

C04B 35/10 (2006.01) C04B 35/115 (2006.01) H01J 61/30 (2006.01)

Patent

CA 2211225

An optically transparent polycrystalline alumina sintered body consists essentially of alumina, magnesia, yttria and zirconia. The magnesia is present in an amount of about 0.020 wgt. percent, the yttria is present in an amount of about 0.035 wgt. percent, and the zirconia is present in an amount of about 0.018 wgt. percent. An arc tube for a high pressure sodium lamp made from this composition has greatly increased resistance to sodium loss and concomitant outer jacket darkening, whereby the effective amount of lumen output is increased.

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