Factors Affecting Nitrogen Dissolution in Sodium Metaphosphate Glass
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.
Y. B. Peng and D. E. Day, "Factors Affecting Nitrogen Dissolution in Sodium Metaphosphate Glass," Journal of the American Ceramic Society, vol. 70, no. 4, pp. 232-236, Wiley-Blackwell, Apr 1987.
The definitive version is available at http://dx.doi.org/10.1111/j.1151-2916.1987.tb04973.x
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)
Article - Journal
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