Thermal Stability and Crystallization Kinetics of MgO–Al 2 O 3 –B 2 O 3 –SiO 2 Glasses

作者：Manuela Reben, Hong Li · 发表于：International Journal of Applied Glass Science · 年份：2011 · DOI：10.1111/j.2041-1294.2011.00039.x · 被引用次数：41 · 研究领域：Glass properties and applications、Advanced ceramic materials synthesis、Recycling and utilization of industrial and municipal waste in materials production

To support commercialization of the MgO–Al 2 O 3 –B 2 O–SiO 2 ‐based low‐dielectric glass fibers, crystallization characteristics of the relevant glasses was investigated under various heat‐treatment conditions. The study focused on the effects of iron on the related thermal properties and crystallization kinetics. Both air‐cooled and nucleation‐treated samples were characterized by using the differential thermal analysis/differential scanning calorimeter method between room temperature and 1200°C. A collected set of properties covers glass transition temperature ( T g ), maximum crystallization temperature ( T p ), specific heat (Δ C p ), enthalpy of crystallization (Δ H cryst ), and thermal stability (Δ T = T p — T g ). Using the Kinssiger method, the activation energy of crystallization was determined. Crystalline phases in the samples having various thermal histories were determined using powder X‐ray diffraction (XRD) and/or in situ high‐temperature XRD method. Selective scanning electron microscope/energy‐dispersive spectroscopy analysis provided evidence that crystal density in the glass is affected by the iron concentration. Glass network structures, for air‐cooled and heat‐treated samples, were examined using a midinfrared spectroscopic method. Combining all of the results from our study, iron in glass is believed to function as a nucleation agent enhancing crystal population density in the melt without altering a primary phase field. By comparing the XRD data of the...