Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1985-10-07
1987-06-30
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 27, 501 62, 501 64, 501 74, C03C 3095
Patent
active
046770810
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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patent: 4520115 (1985-05-01), Speit et al.
Uhlmann, D. R.; et al., Glass: Science and Technology, Vol. 1, Glass-Forming Systems, Academic Press, 1983, p. 152.
Volf, M. B.; Glass Science and Technology, 7, Chemical Approach to Glass, Elsevier Science Publishing Co., New York, N.Y., 1984, p. 392.
Doremus, R. H.; Glass Science, John Wiley and Sons, New York, 1973, pp. 237-239.
Sircar Anup
Thomas George L.
Bell Mark L.
General Electric Company
Jacob Fred
McDevitt J. F.
Schlamp Philip L.
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