Translucent pca ceramic, ceramic discharge vessel, and...

Details Translucent pca ceramic, ceramic discharge vessel, and... Translucent pca ceramic, ceramic discharge vessel, and...

C - Chemistry, Metallurgy

04

B

C04B 35/44 (2006.01) C04B 35/64 (2006.01) H01J 5/04 (2006.01) H01J 61/30 (2006.01)

Patent

CA 2537785

A translucent polycrystalline material suitable for use in ceramic discharge vessels for metal halide lamps is produced by sintering an alumina powder doped with a MgO sintering aid in a nitrogen atmosphere containing a partial pressure of a vapor phase carbon- containing species. The sintered polycrystalline alumina has a grain boundary phase containing aluminum, oxygen and nitrogen. The formation of the AI-O-N grain boundary phase is believed to facilitate the transport of nitrogen from entrapped pores during sintering. Preferably, the PCA is sintered in a carbon-element furnace under flowing ultra-high-purity nitrogen.

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