硼酸镁与硼酸铝纳米晶须的制备及应用的研究-材料物理与化学专业论文.docx

硼酸镁与硼酸铝纳米晶须的制备及应用的研究AbstractNano-materials is a new material and have some special characteristics compared with the conventional materials and broad application prospects. This article mainly studied about the synthesis of magnesium borate and aluminum borate nanowhiskers and the initial work of aluminum borate nanowhiskers applicated in magnesium alloys.1 、 Magnesium borate nanowhiskers was synthesized by hydrothermalsintering. First alkaline magnesium borate nanowhiskers was synthesized by hydrothermal, and then heat-treated to obtain magnesium borate nanowhisker. The results showed that alkaline conditions favor the vertical growth of nanowhiskers, a large aspect ratio nano-whiskers could been got in strong alkaline conditions. At the same time, as the reaction time longer, aspect ratio of nanowhiskers got larger, but the reaction time also had an impact on the lateral nanowhiskers. Whiskers merged with each other and grown nano-films, which is not conducive to the growth of nano-whiskers. There reaction temperature was a very important influence on the growth of nano-whisker, only when reached a certain temperature value, it would generate nano-whiskers. In the heat treatment process, untile the reaction temperature reached 700 ° C, the magnesium borate nanowhiskers got a better crystallinity. Whiskers fractured in the dehydration process, and not changed in the recrystallization process; additional, it is a very important relationship to heated-rate on the fracture of whiskers, more quickly heated rate the more serious fracture of nanowhiskers. Finally, magnesium borate nano-film was prepared by adjusting the reaction conditions. The result showed that the concentration of response has an important effect on magnesium borate nano-film, the higher the concentration, the smaller nano-film.2、Large quantities of BN-coated aluminum borate (Al18B4O33) nanowhiskerswith typical 20-50 nm in diameter and 0.5-2 μm in length have been successfully synthesized by sol