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Title : 大连理工大学（土木水力学院） 建筑材料研究所 所长 大连理工大学建筑能源技术研究中心 主任 辽宁省复合材料学会常务副理事长兼秘书长 政协辽宁省委员会委员 “建筑技术与应用”“混凝土”和“国外连建材科技“等杂志编委
Title of Paper:Research on the preparation and crystallization action of porous glass-ceramics based on CSA system
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Date of Publication:2008-01-01
Included Journals:CPCI-S
Page Number:1732-1739
Key Words:pegmatite; glass-ceramics; crystallization kinetics parameter; sintering
Abstract:Using powder-sintering method, SiO(2)-Al(2)O(3)-CaO-ZnO-R(2)O porous glass-ceramics is produced. The pegmatite is adopted as the main raw material. Five samples with different SiO(2)/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. I sample is the largest among the all samples, which tends to crystallize more easily, all samples' crystallization 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 degrees C formed a large number of closed pores with micron dimension and several semi-open pores distributed uniformly in the glass-ceramics matrix.
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