Study On Preparation Of Nanometer Alumina Fiber By Hydrothermal Method And Its Properties

Metal oxide fiber material is compared with its bulk material with high thermal stability and good flexibility, which is aroused great interest. Alumina fibers is belonged to inorganic fibers, with excellent properties, such as high strength, high temperature resistance, high melting point and other characteristics, but also has strong corrosion resistance, thermal shock resistance, good thermal insulation properties and light weight, small size and so on. Which is a relatively good overall performance engineering materials, both has a vitally important role in terms of composite materials in many fields. Preparation methods are slurry, pre-polymerization method, a dipping method, an anode templates, sol-gel method, etc. But there is existed certain deficiencies to some extent. For example, The anode template method requires a higher devices, sol-gel method usually combines with electrospinning, and process is complex and influenced by many factors.AACH nanofibers were prepared by hydrothermal-thermal decomposition in this article. Get different phase alumina nanofibers by calcined precursor AACH nanofibers. The synthesized AACH nanofibers and alumina nanofibers were characterized systemically by means of FT-TR, TG-DSC,SEM.XRD and other testing methods. The relationship between the calcination process AACH nanofibers morphology, structure phase at different calcination temperatures was researched. The mechanism of produced and decomposed of the AACH nanofibers was preliminary analysis. Finally, the related performance of alumina nanofibers were researched. Be summed up, the main work of this paper are:I. AACH nanofibers were prepared by hydrothermal-thermal decomposition. The synthesized AACH nanofibers were characterized systemically by means of FT-TR TG-DSC.SEM,XRD and other testing methods. The relevant preparation conditions were studied. contained:the reactant concentration in the solution of aluminum nitrate nonahydrate, pH value of the reaction solution, the reaction temperature. surfactant and after processing. Impacts on AACH one-dimensional nanostructures of morphology, structure and phase were researched in those conditions. The growth mechanism of the AACH nanofibers was preliminary analysis. 2. By calcination AACH fiber precursor, the synthesized alumina nanofibers were characterized systemically by means of FT-TR. TG-DSC,SEM,XRD and other testing methods. The relationship between the calcination process AACH nanofibers morphology, structure phase at different calcination temperatures was researched. The decomposition process of the AACH nanofibers was preliminary analysis.3. The related performance of alumina nanofibers were researched by SEM and other testing methods. Which were including insulation and anti-corrosion properties. The results indicated porous alumina obtained by sintering the fibers could be as adsorbent and catalyst. It was applied to the surface, could play favorable effects of.heat insulation and anti-corrosion.