摘要
氧化铝作为最重要的无机功能材料之一,在吸附、催化及陶瓷等领域具有广阔的应用前景。研究制备过程相变路径及形貌变化对氧化铝的可控合成具有重要意义。研究采用非水解与水解溶胶-凝胶法制备氧化铝粉体,利用XRD、TG和SEM等手段对两种方法制得的前驱体凝胶及粉体进行表征。结果表明:非水解溶胶-凝胶法在溶胶-凝胶过程中先生成Al-O-C键,后生成Al-O-Al键;而水解溶胶-凝胶法先生成Al-O-H键,后生成Al-O-Al键。非水解溶胶-凝胶法在煅烧过程中于800℃时形成片状γ-Al_(2)O_(3),其紧密结合呈花状结构;1000℃时花状结构坍塌,部分γ-Al_(2)O_(3)转化为θ-Al_(2)O_(3)和к-Al_(2)O_(3);1200℃时完全转化为α-Al_(2)O_(3)颗粒。而水解溶胶-凝胶法于600℃即可生成γ-Al_(2)O_(3),1200℃时形成纤维状α-Al_(2)O_(3)。
As one of the most important inorganic materials,alumina has a wide application prospect in the fields of adsorption,catalysis and ceramics.The study of phase transformation path and morphological change during the fabrication process is of great significance to the controllable synthesis of alumina.Alumina powders were synthesized by non-hydrolytic and hydrolytic sol-gel method in this study.The precursor gel and the powders calcined at various temperatures were characterized by X-ray diffraction,infrared spectroscopy,thermogravimetric analysis and scanning electron microscopy.The results show as follows:during the sol-gel process,the precursor gel first forms the Al-O-C bond and then the Al-O-Al bond by non-hydrolytic sol-gel method.While the precursor gel first generates Al-O-H bond and then Al-O-Al bond by hydrolytic sol-gel method.During the calcination process,the flower-like structure composed of lamellarγ-Al_(2)O_(3) is obtained by non-hydrolytic sol-gel method after calcined at 800℃.The flower-like structure collapses and part ofγ-Al_(2)O_(3) transform intoθ-Al_(2)O_(3) andк-Al_(2)O_(3) calcined at 1000℃.The mixture phase can be completely transformed intoα-Al_(2)O_(3) calcined at 1200℃.In contrast,precursor powder crystallizes toγ-Al_(2)O_(3) at 600℃and converts to fibrousα-Al_(2)O_(3) at 1200℃by hydrolytic sol-gel method.
作者
刘海清
杨晓峰
陈志萍
韩琳婷
王慧
LIU Haiqing;YANG Xiaofeng;CHEN Zhiping;HAN Linting;WANG Hui(School of science,North University of China,Taiyuan 030051,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2022年第2期20-25,共6页
China Ceramics
基金
山西省自然科学基金项目(201901D111138)
山西省回国留学人员科研资助项目(HGKY2019069)
山西省131领军人才项目(2016)
中北大学理学院研究生创新科研项目(20200802)。
作者简介
刘海清(1995-),女,山西吕梁,硕士。研究方向:功能材料的制备及性能。E-mail:2711295290@qq.com;通信作者:杨晓峰(1976-),男,山西长治,博士,副教授。研究方向:功能材料的制备及性能。E-mail:xiaofengyang2008@126.com。
