Research on the Preparation and Crystallization Action of Porous Glass-ceramics Based on CSA System
Using powder-sintering method,SiO2-Al2O3-CaO-ZnO-R2O porous glass-ceramics is produced.The pegmatite is adopted as the main raw material.Five samples with different SiO2/CaO ration are used in the research.The mechanical properties,microstructures and textures of porous glass-ceramics are investigated by using many different testing measures including differential thermogravimetric analysis / differential thermal analysis (TGA/SDTA),x-ray diffraction (XRD),and scanning electron microscopy (SEM).Then,activity energy of crystallization (E) and crystallization kinetics parameter (k) are calculated based on the Modified Johnson-Mehl-Avrami (JMA) equation.The Avrami n parameter can be obtained according to Augis-Bennett function.The results show that: the k value of No.1 sample is the largest among the all samples,which tends to crystallize more easily,all samplescrystallization process are observed as bulk crystallization.And the main crystal phase is parawollastonite (clinorhombic system) with puncheon shape. Pore-forming agents decomposed at 100-500℃ formed a large number of closed pores with micron dimension and several semi-open pores distributed uniformly in the glass-ceramics matrix.
Pegmatite Glass-ceramics Crystallization kinetics parameter Sintering
Mei Yang Lijiu Wang Shanyu Zhao
School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian,China Personnel Dep School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian,China
国际会议
The First International Conference on Building Energy and Environment(第一届建筑能源与环境国际会议)
大连
英文
1732-1739
2008-07-01（万方平台首次上网日期，不代表论文的发表时间）