Al_2O_3-Y_2O_3-SiO_2系の相平衡及びガラスの分相,結晶化挙動

概要

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Subsolidus phase equilibria in Al_2O_3-Y_2O_3-SiO_2 system and the phase separation and crystallization behavior of glass in this system were studied by X-ray diffraction, differential thermal analysis, scanning electron microscopy and X-ray microanalysis. Phase relations, liquidus and solidus temperatures in this system were obtained. Phase equilibrium was not confirmed in a lower temperature than solidus temperature near 1340℃. The glass transition temperature (T_g) the starting temperature of crystallization (T_c), the 1st and 2nd peak temperatures of crystallization (T_0 and T_0'respectively) were studied as a function of composition. The activation energy of crystallization ΔE was determined by analyzing the heating rate dependence of T_0 and found to be in a range of 472-890 kJ/mol, depending on the composition. ΔE had a tendency to increase with decrease in liquidus temperature, suggesting that the glass becomes stable in compositions with lower liquidus temperatures. During heat treatment of glass at 1300℃, the phase separation was found to occur as an early stage of crystallization.
社団法人日本セラミックス協会の論文
1991-03-01