Glass Formation and Properties in the System Calcia-Gallia-Silica

Abstract

The glass-formation region of the calcia-gallia-silica system was determined. The glasses within this region were measured to have a density of 3 to 4 g/cm3, a refractive index of 1.6 to 1.73, an Abbe number between 35 and 58, a thermal expansion coefficient of 6.5 x 10−7/°C to 11.5 x 10−7/°C, softening temperatures between 730° and 790°C, and a Vickers microhardness of 5.2 to 7.3 GPa. Crystalline phases were identified along the glass-formation boundary. Infrared transmission spectra were used to explain glass structures and their effect on glass properties. The results suggest that the role of calcia in the glass structure is similar to that for calcia in calcium aluminosilicate glasses.

Department(s)

Materials Science and Engineering

Keywords and Phrases

calcia; formation; gallium; silica; Glass--Microgravity Processing; Materials Science; Space Shuttles--Process Control

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1990 Wiley-Blackwell, All rights reserved.

Publication Date

01 Oct 1990

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