Title

Factors Affecting Nitrogen Dissolution in Sodium Metaphosphate Glass

Abstract

The preparation of sodium phosphate oxynitride (Na-P-O-N) glasses was investigated in dry ammonia, forming gas and 90% N2+ 10% CO atmospheres. Significant nitrogen dissolution, up to 13 wt% in a NaPO3 melt, occurred only in ammonia. The kinetics of nitrogen dissolution was studied as a function of remelting time (1 to 96 h) and temperature (660° to 760°C). Higher temperature accelerates nitrogen dissolution, but the temperature should not exceed 760°C. Great improvement in chemical durability occurs with nitrogen dissolution in a NaPO3 melt. Other property changes reported include softening temperature, thermal expansion coefficient, refractive index, microhardness, etc. A double chain structure model is proposed for the Na-P-O-N glass.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Glass - Physical Properties; Nitrogen - Dissolution; Phosphates - Chemical Reactions; Double Chain Structure Model; Sodium Metaphosphate Glass; Glass Manufacture

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1987 Wiley-Blackwell, All rights reserved.

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