High-pressure discharge lamp having a ceramic discharge vessel,

Details High-pressure discharge lamp having a ceramic discharge vessel, High-pressure discharge lamp having a ceramic discharge vessel,

1994-11-29

1997-04-29

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Envelope composition

313493, 501153, 501127, 501119, C04B 3510, H01J 6130

Patent

active

056252560

ABSTRACT:
A ceramic discharge vessel (6) for a high-pressure discharge lamp (1) made from a sintered body of optically translucent polycrystalline alumina ceramic which is doped with only 100-800 ppm MgO, only 200-1200 ppm ZrO.sub.2 and only 10-300 ppm Y.sub.2 O.sub.3 (by weight). This improves the loading capacity and operating characteristics of the vessel and of the lamp.

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Article by Tsai et al, "Transformation Plasticity and Toughening in CeO.s2 --Partially-Stabilized Zirconia-Alumina (Ce-TZP/A1.sub.2 O.sub.3) Composites Doped.sup.2 with MnO", J. Am. Ceram. Soc., 75 [5], pp. 1229-1238 (1992).

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