The Crystallization Kinetics Research of Li2O-Al2O3-SiO2 Glass-ceramic by Thermal Analysis Method
According to the non-isothermal dynamics theory,the kinetic parameters of each exothermic peak of a low-aluminum Li2O-Al2O3-SiO2 transparent glass-ceramics are calculated by Kissinger method and Ozawa method,including crystallization(phase separation)activation energy E and Avrami index n.The results showed that the activation energy calculated by the two methods was not much different.The phase separation activation energy of the phase separation peak calculated by Kissinger method was 446.66 kJ/mol,and the crystallization activation energy of the first crystallization peak and the second crystallization peak were 320.93 kJ/mol and 255.37 kJ/mol,respectively.The Avrami indexes were 0.73,3.57 and 1.57,respectively.The phase separation mechanism was the nucleation-growth phase separation of primary nucleation.The crystallization mechanism was the coexistence of two-dimensional growth bulk crystallization and three-dimensional growth bulk crystallization,and the coexistence of surface crystallization and one-dimensional growth body crystallization,respectively.
lithium aluminum silicon glass-ceramicphase separationcrystallizationactivation energy for crystallizationavrami index
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