Crystallization and thermal expansion behavior of lithium zinc silicate sealing glass |
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Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;1. Institute of Advanced Photovoltaics, Fujian Jiangxia University, Fuzhou 350108, People''s Republic of China;2. Organic Optoelectronics Engineering Research Center of Fujian''s Universities, Fujian Jiangxia University, Fuzhou 350108, People''s Republic of China;1. Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran;2. Electroceramics Group, Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran |
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Abstract: | Effect of heat treatment schedule on the crystallization and thermal expansion behavior of a lithium zinc silicate glass system was investigated by differential scanning calorimeter (DSC), X-ray diffraction, and linear thermal expansion test. Two well-defined crystallization exothermic peaks were observed from the DSC trace. According to the apparent activation energies and avrami parameter values calculated from the two crystallization exothermal peaks, the first crystallization exothermal peak was attributed to a combining surface and internal crystallization behavior, while the second one was found to be internal crystallization. Additionally, the phase evolution and the thermal expansion behavior with increasing heat treatment temperature were found to be closely related. Interestingly, it was found in comparison with previous reports that addition of CaO varies the phase composition of the resulting glass–ceramic in an opposite way to K2O and the deep rooted reason has been discussed which may cast light on the modulation of properties of glass–ceramic involved crystalline phase of quartz or cristobalite. At last, average thermal expansion coefficient of 7.99–15.38×10−6 K−1 in the temperature range of 25–400 °C has been obtained with different heat treatment schedules. |
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Keywords: | Thermal expansion Glass ceramics Silicate Crystallization |
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