Investigation on Crystallization Behavior of Y_2O_3-Al_2O_3-SiO_2 Glass Prepared by High-gravity Combustion Synthesis

The crystallization behavior of Y2O3-Al2O3-SiO2 glass prepared by high-gravity combustion synthesis was investigated by isothermal annealing experiments.The effect of annealing condition on the crystallization behavior of the glass was discussed according to the Y2O3-Al2O3-SiO2 ternary phase diagram.From experimental results,the crystallization behavior of the glass strongly depended on the annealing temperature and the content of SiO2.After being annealed at 1050℃,the sample showed a graded phase distribution along the high-gravity direction,consisting of Al6Si2O13 glass-ceramic,pure glass and χ-Al2O3 glass-ceramic.At annealing temperature of 1100℃,Y3Al5O12 and Y2Si2O7were precipitated as the major crystalline phases.When the annealing temperature further increased to 1200℃,the predominant crystalline phase was Y3Al5O12.The research provides a possible way to prepare Y2O3-Al2O3-SiO2 glass-ceramics by integrating high-gravity combustion synthesis with post annealing treatment.