不同溶剂对合成堇青石粉体结晶性能的影响

以硝酸镁、硝酸铝、正硅酸乙酯作为原料,通过液相法合成堇青石粉体,研究不同溶剂以及体系pH值对合成堇青石粉体结晶性能的影响.利用DTA-TGA、XRD测试手段对粉体进行表征,结果表明:以水为溶剂,体系pH=4时,在1000 ℃时,衍射图谱相对比较平滑,开始生成μ-堇青石以及尖晶石,在1200 ℃,μ-堇青石及尖晶石的衍射峰强度开始降低,开始有α-堇青石生成,在1250 ℃,μ-堇青石的峰基本消失不见,而α-堇青石的峰强度升高,在1350 ℃时,α-堇青石相增多,几乎全部转化为α-堇青石.

Effect of Different Solvents on the Crystallization Properties of Cordierite Powders

Cordierite powders was synthesized by liquid-phase method using TEOS, magnesium and aluminum salts as raw materials.The effects of different solvents and pH value on the crystallization properties of the cordierite powders were characterized by means of DTA-TGA and XRD measurements.The results show that using water as solvent, solution pH value is 4, the cordierite powders sintered at about 1000 ℃ of diffraction pattern is relatively smooth, that phase of μ-cordierite and magnesia alumina spinel occured at 1000 ℃, μ-cordierite and magnesia alumina spinel of diffraction peak intensity begin to decrease at 1200 ℃.The formation of α-cordierite start at 1200 ℃, μ-cordierite phase disappeare, while α-cordierite of peak intensity increase at 1250 ℃, μ-cordierite to α-cordierite transformation is fully completed at 1350 ℃.