摘要
采用非水解溶胶-凝胶法通过浸渍溶胶提拉法在陶瓷过滤管上制备氧化铝薄膜,薄膜孔径分布窄,大小为10 nm左右,晶体粒径大小为20 nm左右。通过XRD、TG-DSC、FE-SEM以及傅立叶变换红外光谱仪测试手段,对非水解溶胶-凝胶法制备氧化铝的反应机制进行了研究。研究结果表明非水解溶胶-凝胶法制备氧化铝薄膜的反应机制为:无水三氯化铝和氧供体醇反应生成铝醇盐,铝醇盐在回流过程中发生非水解缩聚反应生成=Al-O-Al=键合并形成溶胶;溶胶在干燥过程中发生进一步的缩聚及溶剂脱除,形成凝胶,凝胶在900℃左右转变为γ-Al_2O_3,γ-Al_2O_3在1100℃左右转变为α-Al_2O_3。
Alumina film with pore size of about 10 nm, narrow distribution and crystal grain size of about 20 nm coated on ceramic filter tube has been prepared via non hydrolytic sol-gel process combined with dip-coating method in this paper. The reaction mechanism of the non hydrolytic sol gel method was studied by means of TG-DSC, FE- SEM, XRD and FT-IR. The results show that the reaction mechanism of alumina film prepared via non hydrolytic sol-gel method is as follows： anhydrous aluminum chloride reacts with alcohol oxygen donor to produce aluminum alkoxides. Then aluminum alkoxide polycondenses to be =Al-O-Al= in the reflow process. And then the sol further polycondenses in drying process to form a gel. and generateγ-Al2O3 at heat treatment of 900 ℃ . Then α-Al2O3 is transformed into α-Al2O3 at 1100℃ .
出处
《中国陶瓷》
CAS
CSCD
北大核心
2016年第2期47-50,共4页
China Ceramics
