无水醋酸镁的加入时机对非水解溶胶-凝胶法低温制备镁稳定化钛酸铝的影响
发布时间：2018-07-22 13:33
【摘要】：本文以无水三氯化铝和四氯化钛为前驱体,以无水乙醇为氧供体,以无水醋酸镁为稳定剂,采用非水解溶胶-凝胶法制备镁稳定钛酸铝粉体。运用XRD、FT-IR和热膨胀仪等测试手段研究了无水醋酸镁的加入时机对钛酸铝低温合成效果和稳定化效果的影响,探讨了无水醋酸镁的稳定机理。结果表明:无水醋酸镁在铝、钛前驱体发生缩聚反应之前引入不仅不利于钛酸铝的低温稳定化,也大大影响了钛酸铝的低温合成。在铝、钛前驱体发生缩聚反应之后引入时,无水醋酸镁能与铝、钛前驱体缩聚产物进一步发生脱酯缩聚反应形成异质键合,这确保镁能在750℃低温进入钛酸铝晶格形成固溶体,从而提高其热稳定性能。
[Abstract]:In this paper, anhydrous aluminum trichloride and titanium tetrachloride were used as precursors, anhydrous ethanol as oxygen donor and anhydrous magnesium acetate as stabilizer. Magnesium stabilized aluminum titanate powders were prepared by non-hydrolytic sol-gel method. The influence of adding time of anhydrous magnesium acetate on the low temperature synthesis and stabilization of aluminum titanate was studied by means of XRDX FT-IR and thermal expansion instrument. The stabilization mechanism of anhydrous magnesium acetate was discussed. The results show that the introduction of anhydrous magnesium acetate before the condensation of aluminum and titanium precursor is not only unfavorable to the low temperature stabilization of aluminum titanate, but also greatly affects the low temperature synthesis of aluminum titanate. When aluminum and titanium precursor are introduced after condensation, anhydrous magnesium acetate can react with aluminum, and the condensation product of titanium precursor can further deesterification to form heterogeneous bond, which ensures that magnesium can enter the lattice of aluminum titanate at 750 鈩，
本文编号：2137625
[Abstract]:In this paper, anhydrous aluminum trichloride and titanium tetrachloride were used as precursors, anhydrous ethanol as oxygen donor and anhydrous magnesium acetate as stabilizer. Magnesium stabilized aluminum titanate powders were prepared by non-hydrolytic sol-gel method. The influence of adding time of anhydrous magnesium acetate on the low temperature synthesis and stabilization of aluminum titanate was studied by means of XRDX FT-IR and thermal expansion instrument. The stabilization mechanism of anhydrous magnesium acetate was discussed. The results show that the introduction of anhydrous magnesium acetate before the condensation of aluminum and titanium precursor is not only unfavorable to the low temperature stabilization of aluminum titanate, but also greatly affects the low temperature synthesis of aluminum titanate. When aluminum and titanium precursor are introduced after condensation, anhydrous magnesium acetate can react with aluminum, and the condensation product of titanium precursor can further deesterification to form heterogeneous bond, which ensures that magnesium can enter the lattice of aluminum titanate at 750 鈩，
本文编号：2137625
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