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以铝粉(Al)和NH4F为主要原料,Nb为添加剂,在N2压力小于0.5MPa的条件下采用高温自蔓延燃烧法(SHS)合成了一维纳米结构的AlN粉体,并通过差热分析(TG/DSC)分析了Al-N2体系的热力学机理,运用X-射线衍射仪、场发射扫描电子显微镜(SEM)分析了所合成一维纳米结构AlN的物相组成和显微结构.结果表明,当Al∶NH4F为4∶1(wt%)时,在添加剂Nb的作用下,合成的产物主要为一维纳米结构六方长针状AlN,该粉体纯度高、晶体结构完整,且沿(100)存在明显择优取向;所合成的一维纳米结构AlN的生长机理属于SLS生长机理.
One-dimensional nanostructured AlN powders were synthesized by high temperature self-propagating combustion (SHS) using aluminum (Al) and NH4F as main raw materials and Nb as additive, under N2 pressure less than 0.5MPa, and were characterized by differential thermal analysis The thermodynamic mechanism of Al-N2 system was analyzed by TG / DSC. The phase composition and microstructure of the synthesized AlN nanostructures were analyzed by X-ray diffraction and field emission scanning electron microscopy (SEM) , When Al: NH4F is 4: 1 (wt%), under the action of additive Nb, the synthesized product is mainly one-dimensional hexagonal long needle-shaped AlN nanostructures. The powder has high purity and crystal structure, 100). The growth mechanism of the synthesized one-dimensional nanostructured AlN belongs to the growth mechanism of SLS.