Oxynitride glass production procedure

Glass manufacturing – Processes – Operating under inert or reducing conditions

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65134, 501 32, C03C 311, C03B 804

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active

050061429

ABSTRACT:
The invention is a process for the preparation of high quality oxynitride glasses without resorting to high pressures. Nitrogen-containing compounds such as Si.sub.3 N.sub.4 are first encapsulated in a low melting temperature glass. Particles of the encapsulated nitrogen-containing compound are mixed with other oxide glass-formers and melted in an atmosphere of flowing nitrogen and in the presence of buffering gas to form the oxynitride glass. Glasses containing up to 15 at % nitrogen have been prepared by this method.

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Loehman, "Oxynitride Glasses", Journal of Non-Crystalline Solids, 42 (1980), pp. 433-466.
Mittl et al., "Hip Glassmaking for High Nitrogen Compositions in the Y-Si-Al-O-N System", Journal of Non-Crystalline Solids, 71 (1985), pp. 287-294.
Brow et al., "Nitrogen Coordination in Oxynitride Glasses", Communications of the American Ceramic Society, Department of Materials Science and Engineering, The Pennsylvania State University, Apr. 1984, pp. C-72-C-74.
Baik et al., "Suppression of Frothing by Silicon Addition During Oxynitride Glass Synthesis", Commun. of the American Ceramic Society, Materials Science and Engineering, Cornell University, Jul. 1985, pp. C-168-C-170.
Abranovici et al., "Nitrogen-Containing Glasses and Glass Ceramics in Some Me-Si-Al-O-N Systems", Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 586-592.
Imon et al., "Oxycarbonitride Glass Formation by Melt Soldification", Journal of Materials Science Letters, 5 (1986), pp. 397-398.
EGG-MS-8014, Informal Report, Weidner et al., "Oxynitride Glass Technology for Armor and Composite Applications", Final Report, Mar. 1988.

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