Study on Synthesis of Calcium Titanate by the Method of High Temperature Solid-state Method
Based on the theory of CaO-TiO2 phase diagram,this paper studies the Synthesis of calcium titanate by the method of high temperature solid-state method In this study, according to different calcium titanium molar ratio n=(Ca(OH)2) :n-(TiO2) =1-1.4, the author uses Ca(OH)2(AR) and TiO2(Anatase AR) as the raw material, adding polyving akohol whose mass percentage is 2%.After molding and drying, the calcium titanate was synthesized into calcium titanate with the method of being insulated for 2.5h at different temperature of 1500 ℃ 1550 ℃, 1600 ℃ 1650 ℃,1700℃.Then the volume density and apparent porosity were detected by analyzing the the phase composition and microstructure of the materials with XRD and SEM.The results showed that: with the increase of n, the lattice distortion of calcium titanate was synthesiaed, the main phase of the calcium gradually changed its pahse form from CaTiO3 to Ca4Ti7O10 and then to Ca3Ti2O7 with the increase of calcium titanium ratio of n, when n=1.4 Ca4Ti7O10 and Ca3Ti2O7 rakes majority Because of the effect of the multi-crystal transformation, the density of sample is decreased, and the porosity is increased;With the increase of synthetic temperature, the growth of a spherical body with a ladder of formation of the crystal, grain secondary crystallization growth, individual grain abnormal growth, which leads to the synthesis of calcium titanate material decreased significantly the porosity;Calcium carbonate was synthesized by calcium carbonate and titanium dioxide.The optimum synthesis conditions were as follows:the sintering temperature was 1550 ℃and the ratio of calcium to titanium wax n=1.
calcium titanate XRD analysis microstructure secondary crystallized
YANG Jian ZHANG Ling LI Zhihui CHANG Yanan
University of science and technology Liaoning,Anshan,114000,China High temperature material and magnesium resources engineering college,114051,China
国际会议
西安
英文
1-4
2016-09-20（万方平台首次上网日期，不代表论文的发表时间）