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The phase diagrams of Al2-xYxO3-SiO2-Si3N4 system (x=0.75 and 1.06) at 1500°C were studied. Oxynitride glasses were prepared by quenching a liquid phase at 1500°C. The maximum concentration of N atoms in the glasses prepared by this method was in the range of 4.6-4.9 at%. The glass transition temperature, the softening temperature and the crystallization temperature of Al-Y-Si-O-N oxynitride glasses were measured as a function of composition and found to increase with increase in N concentration. The Vickers hardness of the glasses increased with increase in N concentration. Stability and oxidation of oxynitride glass in air at temperatures from 950°C to 1100°C and the solubility of Si3N4 into glass were also studied and discussed.

nihon seramikkusu kyoukai gakujyutsu rombunshi/nippon seramikkusu kyōkai gakujutsu rombunshi

Phase Relations of Al&lt;sub&gt;2-&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Y&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;3-SiO&lt;sub&gt;2&lt;/sub&gt;-Si&lt;sub&gt;3&lt;/sub&gt;N&lt;sub&gt;4&lt;/sub&gt; System (&lt;i&gt;x&lt;/i&gt;=0.75 and 1.06) and Properties of Oxynitride Glasses