中国地球化学学报(英文版)2008，Vol.27Issue(4)：395-400,6.DOI:10.1007/s11631-008-0395-5
Formation and kinetics of porous cordierite from fly ash
Formation and kinetics of porous cordierite from fly ash
摘要
Abstract
Porous cordierite ceramics were prepared from a mixture of coal fly ash and basic magnesium carbonate at 1100-1350℃. Porosity, flexural strength and thermal expansion coefficient of the samples sintered at 1300℃ were estimated to be 26%, 65 MPa and 4.21×10-6/℃, respectively. The kinetics of the formation progress was investigated by stepwise isothermal dilatometry (SID) accompanied with XRD, SEM and porosity measurement. It was found that the isothermal shrinkage data from SID could be well analyzed to get kinetic parameters according to the empirical rate equation developed by Makipirtti-Meng,dY/dt=nk(T)Y(1-Y)1/n, where Y is the fractional shrinkage during the sintering process and n is a dimensionless component. The apparent activation energy △E values for 900-1000℃ and 1050-1150℃ were 1294 and 1778 kJ/mol, respectively.关键词
cordierite/fly ash/kinetics/stepwise isothermal dilatometry (SID)Key words
cordierite/fly ash/kinetics/stepwise isothermal dilatometry (SID)分类
天文与地球科学引用本文复制引用
ZHANG Xuebin,WU Zuosheng,MENG Guangyao,LIU Xingqin..Formation and kinetics of porous cordierite from fly ash[J].中国地球化学学报(英文版),2008,27(4):395-400,6.基金项目
This work is financially supported by the Ministry of Science and Technology of China (No. 2003CB615700). （No. 2003CB615700）
