Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1987-05-01
1988-04-12
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 62, 501 64, 501 74, 252478, 313480, C03C 3102, C03C 3095, C03C 307
Patent
active
047374756
ABSTRACT:
A glass composition specially useful in the glass envelope of TV receiver tubes and which is of the lead silicate type is disclosed comprising in weight percent 30-65% SiO.sub.2, 20-40% PbO, 5-20% alkali metal oxides, 0-2% Al.sub.2 O.sub.3, 0-10% alkaline earth metal oxides, 0.2-2% Sb.sub.2 O.sub.3, and 0.1-0.5% CeO.sub.2. The improvement resides in employment of a novel refining system when the glass is formed which employs Sb.sub.2 O.sub.3, niter and CeO.sub.2 as the refining agents in particular weight proportions to reduce the seed count in the molten glass while also reducing thermal shock breakage when the solid glass product is thereafter thermally reworked.
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Sircar Anup
Thomas George L.
Bell Mark L.
Corcoran Edward M.
General Electric Company
McDevitt J. F.
Schlamp Philip L.
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