Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1995-10-10
1997-05-13
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 35, 501 37, 501904, C03C 332, C03C 410, C03C 1304
Patent
active
056292481
ABSTRACT:
A preferred embodiment of a sulfide glass with improved mechanical and optical properties such as extended transmission in the infrared region of radiation having wavelengths of up to about 15 microns, Tg in the range of 370.degree.-550.degree. C., and thermal stability of 100.degree.-300.degree. C., containing, on mol basis, 36-72% germanium sulfide, 2-38% gallium sulfide and/or indium sulfide, and 26-62% of at least one modifier containing an alkaline earth sulfide. A process for making glass of improved mechanical and optical properties comprises the steps of mixing glass components, including an alkaline earth modifier in elemental or sulfide form; melting the glass components in an inert vessel contained in a sealed ampoule to form a molten mixture; cooling the molten glass mixture to a solid state; annealing the solid glass; and cooling the annealed glass to about room temperature. The glass components can be in elemental form or in sulfide form, and if in elemental form, then sufficient amount of sulfur is added to form sulfides of the glass components.
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M. Xilai, Z. Mingli, Y. Peihong, and G. Fuxi, "Study on Ge-Ga-X (X.dbd.S, Glass Systems", Collected Papers, XIV International Congress on Glass, pp. 118-127 (1986).
Aggarwal Ishwar D.
Harbison Barry B.
Jewell John M.
Merzbacher Celia I.
Bell Mark L.
Kap George A.
McDonnell Thomas E.
The United States of America as represented by the Secretary of
Troilo Louis M.
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