Fluorine-free, zirconia-free, X-ray absorbing silica based glass

Details Fluorine-free, zirconia-free, X-ray absorbing silica based glass Fluorine-free, zirconia-free, X-ray absorbing silica based glass

1980-03-13

1982-12-28

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

252478, 313480, 501 62, 501 64, 501 70, 501 71, 501 72, C03C 304, C03C 310, H01J 100

Patent

active

043662528

ABSTRACT:
A fluorine-free glass composition is disclosed especially adapted for forming the faceplate of a cathode ray tube such as a television tube. The glass is silica based and includes a fluorine-free flux and an X-ray absorber which may comprise lead oxide, barium oxide, strontium oxide, and mixtures thereof. Optionally, the glass may contain still other oxides to impart desired physical properties. The absence of fluorine avoids the usual problems of that ingredient in melting and processing the glass. In addition, the resultant glass as a faceplate provides improved protection to a viewer of a cathode ray tube by excellent absorption of X-rays.

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patent: 4179638 (1979-12-01), Boyd et al.
patent: 4277286 (1981-07-01), Boyd et al.

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