Effect of the steam activation thermal treatment on the microstructure of continuous TiO 2 fibers
Effect of the steam activation thermal treatment on the microstructure of continuous TiO 2 fibers
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DOI：
10.1155/2012/461324
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发表时间：
2012
影响因子：
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通讯作者：
Xiangchao Zhang;Shiying Zhang;Y. You;Yunlong Li
中科院分区：
文献类型：
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作者：
Xiangchao Zhang;Shiying Zhang;Y. You;Yunlong Li
以钛酸酯聚合物为前驱体，采用溶胶-凝胶法合成了连续的二氧化钛纤维。用X射线衍射仪、扫描电子显微镜和高分辨透射电子显微镜对合成的样品进行了表征。初步研究了该合金的晶粒长大动力学。结果表明，采用水蒸气活化法制备的二氧化钛纤维平均直径在20~30µm之间，纤维的晶相由锐钛矿型向金红石型转变，且随着温度的升高，纤维的尺寸变大。在500℃时，金红石相的生长指数为4，生长速率常数为2.55×106 nm/h。在500℃∼700℃和700℃∼800℃下的晶体生长激活能分别为38.62kJ/m ol和143.91 kJ/m o l。
The continuous TiO2 fibers have been synthesized by the sol-gel method using the polymer of titanate as the precursor solution. The as-synthesized samples were characterized using XRD, SEM, and HR-TEM analysis methods. The grain growth kinetics was primarily investigated. The results demonstrated that the average diameters of the fibers were in the range of 20-30 µm, the crystal phase of the synthesized TiO2 fiber was transformed from anasate to rutile, and the crystal size became bigger with increasing the temperature using steam activation. The growth exponent and the constant of growth rate of the rutile crystal phase at 500°Cwere 4 and 2.55×106 nm/h, respectively. The activation energies of crystalline growth during 500°C ∼ 700°C and 700°C ∼ 800°C were 38.62 kJ/mol and 143.91 kJ/mol, respectively.