C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 16/06 (2006.01) H01J 9/00 (2006.01) H01J 9/20 (2006.01)
Patent
CA 2056588
METHOD FOR APPLYING A PROTECTIVE COATING TO A HIGH-INTENSITY METAL HALIDE DISCHARGE LAMP A method for applying a protective coating to the inner surface of the arc tube of a high-intensity metal halide discharge lamp involves dosing the arc tube with an inert gas that is doped with a metal hydride gas. Preferably, the metal hydride gas comprises silane. The arc tube is heated to a sufficiently high temperature to decompose the silane gas. As a result, silicon is deposited as a protective coating on the inner surface of the arc tube wall. The hydrogen gas that is generated by the silane decomposition is removed from the system either by pumping it out before dosing the arc tube with the final arc tube fill, or by diffusion through the arc tube wall during operation of the lamp.
Gorczyca Thomas B.
Witting Harald L.
Company General Electric
Craig Wilson And Company
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