Ceramics-Silikáty 55 (3) 228-231 (2011)

Dependence of glass-forming ability on starting compositions in Y₂O₃–Al₂O₃–SiO₂ system

L. Wu, G. Liu, J. Li, B. He, Z. Yang, Y. Chen

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 Y₃Al₅O₁₂–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, Al₆Si₂O₁₃, 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.

Keywords: Glass, Composition, Crystallization, Density