【摘 要】
：
Glass-ceramics containingβ-quartz as a main crystal phase based on the system of SiO2-Al2O3-Li2O-K2O-MgO-ZnO were investigated for the application to magnetic
【机 构】
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College of Materials Science and Engineering
【基金项目】
：
the National Natural Science Foundation of China;The High Tech. Program of Ministry of Science Technology of China;上海大学校科研和教改项目;The Applied Materials (AM) Foundation;The Key Subject Construction Proje
论文部分内容阅读
Glass-ceramics containingβ-quartz as a main crystal phase based on the system of SiO2-Al2O3-Li2O-K2O-MgO-ZnO were investigated for the application to magnetic storage substrate for higher storage capacity.Parent glasses were prepared, then nucleated and crystallized at certain temperatures for 3～4 h. The crystallization kinetics of glass-ceramics was also studied. The grain size was estimated by Scherrer formula and image treatment of transmission electron microscopy (TEM). The results showed that the Avrami exponent was determined to be 3.88, the activation energy 189.3±7 kJ/mol and the grain size 30～60 nm. A detailed microstructure of the glass-ceramics, including grain distribution and the morphology of nano-crystalline was characterized by TEM, X-ray diffraction (XRD), differential scanning calorimeter (DSC), differential thermal analysis (DTA). The relationship between microstructure and mechanical properties was also discussed.
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