Crystallization Kinetics of Nanophase Glass-Ceramics as Magnetic Disk Substrate  

作　　者：Shengyu JIANG Jiancheng ZHANG Feng GU Yue SHEN Hua WANG 

机构地区：[1]College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

出　　处：《Journal of Materials Science & Technology》2006年第2期211-214,共4页材料科学技术（英文版）

基　　金：The work was supported by the National Natural Science Foundation of China(Grant No.90206017);the High Tech.Program of Ministry of Science and Technology of China(Grant No.2003BA301A21);the Science and Technology Development Foundation of University of Shanghai(Grant No.02AK26);the Applied Materials(AM)Foundation(Grant No.0208);the Key Subject Construction Project(Material Science)of Shanghai Educational Committee.

摘　　要：Glass-ceramics containing β-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 k J/tool 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.Glass-ceramics containing β-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 k J/tool 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.

关 键 词：GLASS-CERAMICS KINETICS Disk substrate 

分 类 号：TQ584.2[化学工程—精细化工]