Properties of siliconaluminumyttrium oxynitride glasses
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The thermal and mechanical properties of two Si-Al-Y-O-N systems, including linear thermal expansion coefficient, glass transition temperature, elastic modulus, hardness and fracture toughness, were characterized. Results are compared with those previously reported in the literature in an attempt to expand our knowledge of silicon oxynitride glasses. It is found that increasing the nitrogen content generally results in decreasing the linear thermal expansion coefficient while increasing the glass transition temperature, the elastic modulus and the hardness. These observations are consistent with previous studies on similar oxynitride glasses. Present work also shows that the Y:Al cation ratio has a stronger effect on the thermal properties of the glasses than does the nitrogen content, a factor not systematically examined before. The outcome of this work adds to the database on oxynitride glasses which is essential in research on silicon nitride ceramics.
