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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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【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 LI He-zhang,LüGuang-shu,WANG Quan-sheng,CAI Gang-yi(School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China);Study on the thermal expansion properties of plasma spraying ZrO_2 composite coatings[J];Ordnance Material Science and Engineering;2006-06
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1 Zhan Hongren~(1,2),Li Jie~1,Gao Chengfen~2,Jiang Tao~1,Fan Zhanguo~(1*)(1.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China;2.School of Mechanical Engineering,Shenyang Institute of Chemical Technology, Shenyang 110142,China);Measurement of Molten Boron-rich Slag Conductivity at High Temperature[A];[C];2010
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1 SUI Puhui,LU Lei,ZHANG Cuiling(College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China);Research on heat treatment process of Li_2O-ZnO-Al_2O_3-SiO_2 glass-ceramics by orthogonal testing method[J];Ordnance Material Science and Engineering;2009-03
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1 ZHOU Xiya;LI Mingying;WAN Jie;PENG Congcong;School of Materials Science and Engineering,South China University of Technology;;Research Progress of CBN Composites with Glass-ceramic[J];China Ceramics;2013-10
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