【摘要】 以氯化铝和铝粉为铝源,水为溶剂,乙醇为辅助溶剂,采用溶胶-凝胶结合静电纺丝方法,制备了柔性γ和α氧化铝纤维,研究了溶胶中铝单体和Al₁₃组成情况对氧化铝纤维微观结构、物相转变和隔热性能的影响。溶胶中Al₁₃含量较多能推迟纤维的物相转变,使γ-Al₂O₃纤维的气孔和组成颗粒增大,降低γ-Al₂O₃纤维的比表面积,降低γ-Al₂O₃和α-Al₂O₃纤维的导热系数。S4组γ-Al₂O₃和α-Al₂O₃纤维的导热系数仅为0.08087和0.1251 W/m·k。研究表明,溶胶中较高的Al₁₃含量有利于提高纤维材料的隔热性能。更多还原

【Abstract】 Using aluminum chloride and aluminum as raw materials, pure water as solvent, ethanol as aid solvent, alumina sols containing different proportions of alumina monomer and Al₁₃ were prepared. Gel fibers were prepared by electrospinning, and flexible flocculence γ-Al₂O₃ and α-Al₂O₃ fibers were fabricated. The impacts of sol composition on the microstructure of fibers, phase transformation and insulation performance were investigated. Al₁₃ can delay the phase transformation of the fibers, more content of Al₁₃ in sol can enlarge the size of pore and grain of γ-Al₂O₃ fibers, and reduce specific surface area as well as the thermal conductivity of alumina fibers. The thermal conductivity of γ and α alumina fibers prepared by S4 was only 0.08087 and 0.1251 W/m·k, indicating that high content of Al₁₃ was good for improving the thermal insulation properties of the fibers.更多还原