Accession Number : AD0729676

Title :   High Temperature IR Glasses.

Descriptive Note : Technical rept. no. 1, 1 Sep 69-31 Aug 71,

Corporate Author : MISSOURI UNIV ROLLA DEPT OF CERAMIC ENGINEERING

Personal Author(s) : Kreidl,Norbert J.

Report Date : 31 AUG 1971

Pagination or Media Count : 42

Abstract : Fields of glass formation, crystalline phases in these fields, ranges of immiscibility, and the relation of composition as well as heat treatment to the glass temperature in selected chalcogenide glass systems were investigated. The main objective of the investigation was to acquire knowledge for the development of glasses having a higher softening range than industrial chalcogenide glass window materials while maintaining their infrared transmittance. In the field Ge-Sb-Se, in which the industrial glass Ge28Sb12Se60 occurs, the softening temperature was maximized with promising excursions into quaternaries such as those with B and As. The investigation was extended into the field Si-As-Te which has not been exploited industrially because glasses invariably exhibited oxygen infrared absorption bands. High softening range glasses were registered, including some quaternary derivatives, in the hope for later elimination of the oxygen band by more sophisticated product and process control. A facility for preparing pure reproducible chalcogenide glass samples was designed, constructed, and operated successfully. (Author)

Descriptors :   (*CERAMIC MATERIALS, *PHASE STUDIES), (*INFRARED WINDOWS, CERAMIC MATERIALS), SELENIDES, TELLURIDES, GERMANIUM COMPOUNDS, ANTIMONY COMPOUNDS, PHASE DIAGRAMS, HEAT TREATMENT, SILICON COMPOUNDS, ARSENIDES, MELTING

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE