Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1997-03-14
1998-12-08
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 37, 501904, 65389, 65390, C03C 332
Patent
active
058468897
ABSTRACT:
A selenide glass with improved mechanical and optical properties such as ended transmission in the infrared region of radiation having wavelengths beyond 15 microns; Tg in the region of 363.degree.-394.degree. C.; and thermal stability of 85.degree.-145.degree. C. based on the difference between T.sub.g and T.sub.x, comprising, on mol basis, 20-70% germanium selenide, 0.5-25% gallium selenide, indium selenide or mixtures thereof; and 5-50% of at least one alkaline earth in selenide form is described. A process for improving mechanical and optical properties of a selenide glass based on germanium selenide comprises the steps of mixing glass components, including a modifier in elemental or selenide form; melting the glass components 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 is also described. The glass components can be in elemental form or in the form of selenides, and if in elemental form, then sufficient amount of selenium is added to form selenides of the glass components.
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Aggarwal Ishwar D.
Harbison Barry B.
Moon John A.
Sanghera Jasbinder S.
Edelberg Barry
Group Karl
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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