Discharge lamps with coated ceramic arc tubes and fabrication th

Details Discharge lamps with coated ceramic arc tubes and fabrication th Discharge lamps with coated ceramic arc tubes and fabrication th

1986-06-16

1988-04-05

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313636, 4271264, 445 58, H01J 924, H01J 6135

Patent

active

047361360

ABSTRACT:
A high pressure sodium lamp brightness was increased 8.9%, its relative voltage stability was improved by a factor of 4, and its relative maintenance was improved by a factor of 3 over a 24,000 hour lifetest. These improvements were accomplished by the application of a fine grained alumina protctive coating on the surface of the polycrystalline alumina arc tube. The process for applying the protective coating comprises the deposition of Al(NO.sub.3).sub.3 from solution on the surface of the arc tube followed by the thermal decomposition of the Al(NO.sub.3).sub.3 to form an alumina coating on the surface of the alumina arc tube.

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Yuldas and Partlow "Formation of Continuous Beta Alumina Films and Coatings at Low Temperatures", Ceramic Bulletin, vol. 59, No. 6 (1980), pp. 640-642.

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