Accession Number : ADD018586
Title : Infrared Transparent Selenide Glasses.
Descriptive Note : Patent Application, Filed 14 Mar 97,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Moon, John ; Sanghera, Iasbinder ; Harbison, Barry ; Aggarwal, Ishwar D
PDF Url : ADD018586
Report Date : 14 Mar 1997
Pagination or Media Count : 14
Abstract : A selenide glass with improved mechanical and optical properties such as extended transmission in the infrared region of radiation having wavelengths beyond 15 microns; Tg in the region of 363.394 deg C.; and thermal stability of 85-145 deg C. based on the difference between T(g) and T(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.
Descriptors : *PATENT APPLICATIONS, *GLASS, OPTICAL PROPERTIES, MECHANICAL PROPERTIES, TRANSPARENCE, THERMAL STABILITY, MIXTURES, INFRARED OPTICAL MATERIALS, SELENIDES
Subject Categories : Ceramics, Refractories and Glass
Distribution Statement : APPROVED FOR PUBLIC RELEASE