苹果酸溶胶-凝胶法制备氧化铝长纤维

摘要

The precursor sol of alumina was prepared by sol-gel method with aluminum nitrate and malic acid as raw materials.The effects of content of malic acid and polyvinylpyrrolidone (PVP) on sol spinnability were explored.The gel fibers with above 80 cm in length were obtained by mixing aluminum nitrate,malic acid and PVP on mass ratio of 10:3:1.5.Thermogravimetry-differential scanning calorimetry (TG-DSC),Fourier transform infrared (FTIR) spectrum,X-ray diffractometry (XRD),and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers.The alumina fibers with a smooth surface and about 20 μm in diameter were obtained by sintering at 1 200 ℃,and their main phase was indentified to be α-Al2O3.%用硝酸铝、苹果酸为原料,用溶胶-凝胶法制备氧化铝前驱体溶胶.研究了苹果酸、聚乙烯吡咯烷酮（PVP）的加入量对溶胶可纺性能的影响.研究发现:当硝酸铝、苹果酸、PVP的质量比为10∶3∶1.5时,得到的凝胶纤维长度大于80 cm.用热重一差示扫描(TG-DSC)、傅里叶转换红外线光谱(FTIR)、X射线衍射(XRD)、扫描电镜(SEM)分析方法对凝胶纤维和陶瓷纤维进行了表征.凝胶纤维的长度大于80 cm.凝胶纤维在1 200℃煅烧1h后,物相为α-Al2O3,得到的氧化铝纤维直径均匀、表面光滑,纤维直径为20 μm.