Crystallization of glass with Y₂Si₂O₇-mullite eutectic composition

Abstract

In this paper, the crystallization of the glass with Y 2 Si 2 O 7 -mullite eutectic composition was examined. A dendrite Y 2 Si 2 O 7 crystalline grows from the surface of the glass bulk at 1302 K. A competitive growth of Y 2 Si 2 O 7 phase and mullite phase occurs at 1430 K. The activation energy for the competitive growth can be estimated to 329 kJ/mol. The activation energy for the crystallization of hypoeutectic and hypereutectic composition increases with increasing the amount of the primary phase.