Microstructure and Crystallization Kinetics Analysis of MO-B2O3-Al2O3-SiO2(M=Mg,Ca,Ba) Glass-ceramics
The effect of alkali earth metal oxides MO (M=Mg,Ca,Ba) on the crystallizing behavior and the microstructure of B2O3-Al2O3-SiO2 system (BAS) were studied.DSC,XRD and SEM were used to analyze the crystallization kinetics and to characterize the crystal phases and microstructures of the glass-ceramics.MO can effectively facilitate the formation of BAS glass,and the crystallinity of the glass increases in the order of MgO < BaO < CaO.For one given MO,the crystallinity of the glass is dependent on B2O3/SiO2 ratio:the lower the ratio is,the weaker the crystallinity of the glass will be.It was found that the early crystallization is aluminum metaborate (Al4B2O9) when the glass is heated at 800 ℃,and it would transfer into aluminum borate(Al18B4O33) at temperatures over 1000 ℃.The activation energy and the Avrami exponent of Al4B2O9 were calculated by Ozawa formulation.
B2O3-Al2O3-SiO2 system Crystallization Kinetics Microstructure Glass-ceramics
Huabin Liu Hanning Xiao Yaoju Luo Hongwei Liao Haibo Chen
College of Materials Science and Engineering,Hunan University,Changsha 410082,China College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
1415-1418
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）