Fused silica article having titania-silicate barrier zone

Details Fused silica article having titania-silicate barrier zone Fused silica article having titania-silicate barrier zone

1976-09-23

1978-05-23

Hoffman, James R.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

427160, 427167, 427255, 428428, 428432, B05D 302, B05D 506, B32B 1706

Patent

active

040911632

ABSTRACT:
A titania-silicate glass zone or layer is formed at the surface in fused silica by first applying a thick opaque polycrystalline titania powder coating to the silica and then fusing the coating into the silica at a high temperature. Such a zone reduces the ultraviolet transmission of the silica and also lowers its sodium ion conductivity. The zone may usefully be formed on the fused silica arc tubes of metal halide lamps in order to inhibit sodium loss and on other discharge lamps required to be ozone free.

REFERENCES:
patent: 3161537 (1964-12-01), Dettre et al.
patent: 3352708 (1967-11-01), Lyon et al.

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