Oxynitride glass ceramics

Lonergan, J., Morrissey, V., Hampshire, S. (1992), Optimisation of heat-treatment schedules for oxynitride glass-ceramics , Brit. Ceram. Proc., 49, 57-62. 

HM oxynitride glass ceramic fiber (reference) Melt spun through bushing [26]... 

Oxynitride glass ceramic matrices ean be prepared by introducing the nitrogen in the form of Si3N4 or AIN, which can be ineorporated into an oxide based glass ceramic to give p -sialon, an oxynitride glass ceramie [81], when erystallized ... 

NMR spectroscopy. The effect of Si3N4 and AIN on the fabrication of lithium-aluminosilicate oxynitride glass ceramics has been investigated using NMR spectroscopy.The thermal oxidation of P-sialon powders has been followed using Al and Si MAS NMR spectroscopy. a-Sialon ceramics synthesized from a clay precursor have been characterized using MAS NMR spectroscopy. Al and Si NMR spectra have been reported for Si-Al-O-N glasses. 

Oxynitride glasses - glass ceramics composites S Hampshire, University of Limerick, Ireland 560... 

Oxynitride glasses may be heat treated to form glass-ceramics, effectively multi-phase composites. The process involves heat treatment at two different temperatures, firstly to induce nucleation, then to allow crystal growth of the nuclei. The crystalline phases formed depend on both the composition of the parent glass and the temperatures used for heat treatment. The extent of their formation and growth, the relative amounts and distributions of different phases (including residual glass) and their characteristics will determine the overall properties of the particular composite. The formation of these types of materials and their properties is outlined below. 

Crystallisation of oxynitride glasses to form multi-phase glass-ceramic composites... 

As with other silicate glasses, oxynitride glasses may be heat treated at appropriate temperatures to crystallise as glass-ceramics (Leng-Ward and Lewis, 1990 Thompson, 1992 Hampshire, 1993). The crystalline phases formed depend on both the composition of the parent glass and the heat-... 

Hampshire, S. (1993), Oxynitride glasses and glass-ceramics , in Chen I.W., Becher, P.F., Mitomo, M., Petzow, G., Yen, T-S. (eds), Silicon Nitride Ceramics - Scientific and Technological Advances, Mater. Res. Soc. Symp. Proc., 287, 93-100. 

Hampshire, S., Ramesh, R. (1996), Oxynitride liquids, glasses and glass-ceramics , invited presentation at 1st International Workshop on Synergy Ceramics, Nagoya, Japan, November, 1996. 

Hampshire, S., Flynn, R., Lonergan, J., O Riordan, A. (1992), Oxynitride glass systems and subsequent glass-ceramic heat treatments , in Carlsson, R. (ed.), Ceramic Materials and Components for Engines, Proc. 4th Int. Symp. Goteborg, June 1991, London, Elsevier Applied Science. 

Leng-Ward, G., Lewis, M.H. (1990), Oxynitride glasses and their glass-ceramic derivatives , in Lewis, M.H. (ed.), Glasses and Glass-ceramics, London, Chapman Hall. 

Rouxel, T., Verdier, P. (1996), SiC particle reinforced oxynitride glass and glass-ceramic composites crystallization and viscoplastic forming ranges , Acta Mater., 44, 2217-25. 

Practical interest in nitrides is mainly focussed in their use as tough ceramics such as sialons and interstitial nitride coatings on metals [368,369]. Silicon oxynitride glasses are of importance in fiber optics as their refractive indices depend on the nitrogen content. There are surely other interesting properties awaiting exploration. 

OXYNITRIDE GLASSES EFFECTS OF COMPOSITION ON GLASS FORMATION AND PROPERTIES WITH IMPLICATIONS FOR HIGH TEMPERATURE BEHAVIOUR OF SILICON NITRIDE CERAMICS... 

This paper outlines the effect of composition on oxynitride glass formation and properties that crucially affect the high temperature mechanical behaviour of silicon nitride based ceramics. 

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