Crystallization Kinetics of Nanophase Glass-Ceramics as Magnetic Disk Substrate

材料科学技术（英）, 2006, 22(2): 211-214.

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1.College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

2.College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

3.College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

4.College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

5.College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

基金项目: The High Tech. Program of Ministry of Science Technology of China(2003BA301A21) The Key Subject Construction Project of Shanghai Educational Committee the National Natural Science Foundation of China(90206017) 上海大学校科研和教改项目(02AK26) The Applied Materials (AM) Foundation(0208)

Crystallization Kinetics of Nanophase Glass-Ceramics as Magnetic Disk Substrate

Keywords： Glass-ceramics

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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Crystallization Kinetics of Nanophase Glass-Ceramics as Magnetic Disk Substrate

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