Use of silver and nickel silicide to control iodine level in ele

Details Use of silver and nickel silicide to control iodine level in ele Use of silver and nickel silicide to control iodine level in ele

1994-09-02

1995-08-01

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, 313553, 313637, 313638, H05B 4116

Patent

active

054382440

ABSTRACT:
Silver metal and nickel silicide are added to the fill of an electrodeless high intensity metal halide discharge lamp, which includes at least one metal iodide as a fill ingredient, for controlling the iodine vapor level therein. The nickel silicide acts to getter oxygen which has been introduced into the arc tube during lamp processing, thereby avoiding oxidation of the metal iodide portion of the fill and a concomitant release of free iodine into the arc tube. The silver acts to getter free iodine available from the metal iodide(s) of the fill as metal diffuses into the quartz arc tube wall, forming silver iodide (AgI). The combination of silver and nickel silicide acts to control the iodine level below an arc instability threshold to promote and maintain arc stability. In addition, neither silver nor nickel silicide attack the quartz arc tube wall. Lamp performance and lamp life are thus substantially improved.

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patent: 5136214 (1992-08-01), Roberts et al.
patent: 5187412 (1993-07-01), El-Hamamsy et al.
patent: 5343118 (1994-08-01), Chang

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