【摘要】：本文以無水三氯化鋁和四氯化鈦為前驅(qū)體,以無水乙醇為氧供體,以無水醋酸鎂為穩(wěn)定劑,采用非水解溶膠-凝膠法制備鎂穩(wěn)定鈦酸鋁粉體。運(yùn)用XRD、FT-IR和熱膨脹儀等測(cè)試手段研究了無水醋酸鎂的加入時(shí)機(jī)對(duì)鈦酸鋁低溫合成效果和穩(wěn)定化效果的影響,探討了無水醋酸鎂的穩(wěn)定機(jī)理。結(jié)果表明:無水醋酸鎂在鋁、鈦前驅(qū)體發(fā)生縮聚反應(yīng)之前引入不僅不利于鈦酸鋁的低溫穩(wěn)定化,也大大影響了鈦酸鋁的低溫合成。在鋁、鈦前驅(qū)體發(fā)生縮聚反應(yīng)之后引入時(shí),無水醋酸鎂能與鋁、鈦前驅(qū)體縮聚產(chǎn)物進(jìn)一步發(fā)生脫酯縮聚反應(yīng)形成異質(zhì)鍵合,這確保鎂能在750℃低溫進(jìn)入鈦酸鋁晶格形成固溶體,從而提高其熱穩(wěn)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，

本文編號(hào)：2137625