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《Glass & Enamel》 2009-05
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Study on Crystallization and Thermal Expansion of Li_2O-ZnO-Al_2O_3-SiO_2 Sealing Glass Ceramics

AI Chuan-cai1,LIU Shu-jiang2(1.New Enterprise Ltd.Corporation of Jinan Steel Group,Jinan 250101,China;2.Glass and Ceramic Key Laboratory,Shandong Institute of Light Industry,Jinan 250353,China)  
The homogeneous and colorless Li2O-ZnO-Al2O3-SiO2 system basic glasses were prepared by using conventional melt quenching technology and the glass-ceramics which can be used to seal with 4J 29 Kovar alloy were obtained through the processes of nucleation and crystallization.The compositional dependence of crystallization and thermal expansion behavior were studied by using DTA and XRD.The results show that,NBO/T value increases with substituting ZnO for(SiO2+Al2O3),the first and third exothermic peak shift towards lower temperature,whereas the second exothermic peak shifts slightly to higher temperature.As for the glass with composition 24.5Li2O-15ZnO-8.55Al2O3-51.25SiO2-0.7P2O5,obvious effects of crystallization temperature Tp on the type and content of the crystalline phase are observed.With increasing crystallization temperature the primary crystalline phase varies from cristobalite to Li2Al2Si3O10,and the secondary crystalline phase varies from βⅡ/-Li2ZnSiO4 to γ0-Li2ZnSiO4.Additionally,thermal expansion coefficient varies from 40.2 ×10-7/K to 123.6×10-7/K.And the thermal expansion coefficient 49.5×10-7/K was obtained by heat treatment at 535℃ for 2h and 700℃ for 2h,which can meet the requirements of sealing with 4J 29 Kovar alloy.
【CateGory Index】: TQ171.1
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