Microstructure and Kinetics of Crystallization of MgO‐Al2O3−Si02 Glass‐Ceramics

摘要: Quantitative X-ray diffraction and microscopy were used to study the morphology development overall crystallization rate between 900° 990°C of MgO-Al2O3−SiO2 glasses with added ZrO, TiO2, CaF2, or CeO2. Three basic stages micro-structural distinguishable: I, an induction period, II, a spherulitic stage, III, final stage. The duration high-quartz solid solution, microstructures varied markedly prior nucleation treatment type modifier present in glass nearly equal silica content. roles major (high-quartz ss, high cordierite) minor crystalline liquid phases textural are discussed, it is postulated that nucleants (ZrO2, TiO2) act also as growth-modifying “impurities” crystal growth.