Sodium halide discharge lamp with an alumina silicate barrier zo

Details Sodium halide discharge lamp with an alumina silicate barrier zo Sodium halide discharge lamp with an alumina silicate barrier zo

1974-06-05

1977-09-06

Demeo, Palmer C.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

H01J 6135

Patent

active

040470679

ABSTRACT:
A graded alumina silicate glass layer or zone is formed at the surface of fused silica by first applying a polycrystalline coating of aluminum oxide to the silica and then fusing the coating into the silica at a high temperature. Such a zone on the outside of the fused silica arc tube of a metal halide lamp containing sodium is particularly effective to inhibit sodium loss by diffusion through the tube walls.

REFERENCES:
patent: 2568459 (1951-09-01), Noel
patent: 3259777 (1966-07-01), Fridrich
patent: 3350598 (1967-10-01), Corbin et al.
patent: 3845343 (1974-10-01), Hammer

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