Ceramics-Silikáty 55, (3) 228 - 331 (2011) |
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DEPENDENCE OF GLASS-FORMING ABILITY ON STARTING COMPOSITIONS IN Y₂O₃–Al₂O₃–SiO₂ SYSTEM
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Wu Liang, Liu Guanghua, Li Jiangtao,
He Bin,
Yang Zengchao,
Chen Yixiang
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Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Keywords: Glass, Composition, Crystallization, Density
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The dependence of glass-forming ability on starting compositions in Y₂O₃–Al₂O₃–SiO₂ (YAS) system has been investigated
by melting experiment. Transparent YAS glasses have been prepared under the condition of furnace cooling instead
of quenching. It is found that, in the YAS ternary phase diagram, the compositions on the Y₃ Al₅O₁₂–SiO₂ line and with
52-68 mol% SiO₂ have a higher glass-forming ability to produce pure glass. For the compositions with too much or less SiO₂
or with Y/Al = 5/3, 1/1, or 1/3, crystallization occurs with the formation of Y₃Al₅O₁₂, Y₂Si₂O₇, A₁₆Si₂O₁₃, or SiO₂. The densities
of the YAS glasses increase with decreasing SiO₂ contents and increasing Y/Al ratios, and for the samples with Y/Al = 3/5
there is a good linear relationship between the density and SiO₂ content. |
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