纳米铝热剂的制备及其表征

【作者】 李兆娜；

【导师】 马海霞；

【作者基本信息】 西北大学 ， 应用化学， 2009， 硕士

【摘要】 推进剂是以推进为目的的复合型含能材料，是提供推进力的能源，是火箭和导弹发动机的动力源，固体推进剂的性能直接影响导弹武器的作战效能和生存能力，高能固体推进剂是高性能导弹武器系统研制的技术基础。纳米催化剂由于具有量子尺寸效应、表面效应和宏观量子隧道效应，导致其表面积巨大且表面活性中心多，因此在固体推进剂中的催化燃烧中展现了良好的应用前景。本文制备了一系列纳米金属氧化物及其与纳米铝粉的复合物，并进行了表征。主要研究内容如下：1．对应用较广泛的纳米催化剂Fe₂O₃、NiO、MgO等一元金属氧化物进行了纳米化制备，并采用X-射线粉末衍射、扫描电镜（SEM）、热重分析和红外分析进行了表征。结果表明，制备了颗粒形状及大小都比较均匀的纳米氧化Fe₂O₃，粒径均在50-100 nm范围；纳米氧化镍粉体呈球形，粒径范围在50-200 nm，微粒形状不是很规则；纳米氧化镁粉体呈球形且形貌规则，粒径在50-200 nm范围内；纳米氧化铜微粒呈块体立方形，也有少数球形，粒径范围在50-200 nm；采用共沉淀法制备纳米四氧化三铁粉体，实验结果表明，所得产品是Fe₂O₃。2．采用溶胶-凝胶法制备了纳米Fe₂O₃／Al、NiO／Al、MgO／Al粉体，并进行了表征。结果表明，得到粒子晶化非常完全的纳米Fe₂O₃／Al粉体，且纳米粉体呈均匀球形，粒径很小，粒径范围在50 nm左右；得到了不纯的NiO／Al粉体，并且纳米粉体颗粒很不规则；得到形状极不规则的纳米MgO／Al粉体，且有明显在团聚现象。同时还对实验所用的两种铝粉进行了分析，结果表明，所用原料纳米铝粉粒径都很大，且团聚现象都很严重。更多还原

【Abstract】 Propellant is composite energetic materials, which is energy sources unfolding the propulsion; which is the power supply of the rocket and guide missle engine. The performance of solid propellant effect the operation efficiency and survivability of missile weapon, the high energy solid propellant is the technical basis of the research of high energy missile weapon system. Owing to the fact that quantum size effect, superficial effect and macroscopic quantum tunnel effect, which lead to huge surface and many superficial activated centers, nanoparticles as combustion catalyst have a good application foreground in the solid propellant. In this thesis, a series of nanocomposite oxides and some composite were prepared and characterized. Main results of this thesis are as follows:1. Nanocrytalline Fe₂O₃、NiO、MgO and CuO were prepared, because these mono-metal oxides are usually used in propellants, and characterized method by XRD、SEM、TG and IR, results indicated that the nanocrystalline Fe₂O₃ powders were prepared with relatively uniform particle size and shape, the range of particle size of Fe₂O₃ is 50-100 nm; the nanocrystalline NiO powders are sphere, the range of particle size of NiO is 50-200 nm with an irregular shape; the nanocrystalline MgO powders is sphere with a regular shape, the range of particle size is 50-200 nm; the nanocrystalline CuO powders is cube and a few sphere, the range of particle size is 50-200 nm. Nanometer Fe₃O₄ was prepared by coprecipitation, but the results show that the preparation is Fe₂O₃.2. Nanometer Fe₂O₃/Al、NiO/Al and MgO/Al were prepared by sol-gel synthetic approach and characterized. The results show that Fe₂O₃/Al nanometer powders were fully crystallized, and the powders are uniform sphere and smaller crystal size, the particle size is 50 nm; The impurity NiO/Al prepared with an irregular shape; The MgO/Al powders were prepared with an extremely irregular shape, and obviously agglomerates can be observed. At the same time, nano-aluminium used by experiment are analyzed, the results show that the particale size is large with obviously agglomerates.更多还原