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

1996-07-29

1997-10-28

Patel, Ashok

Electric lamp and discharge devices

With gas or vapor

Envelope composition

313638, 313573, 501152, 501153, H01J 6130, C04B 3510

Patent

active

056820828

ABSTRACT:
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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European Patent Applciantion No. 93-119959.0 Dec. 1993.

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