纳米SiO_2/Al复合粒子的制备

Preparation of Nanometer SiO_2/Al Composite Particle

摘 要 利用在活化微米金属铝粉表面包覆纳米SiO2 致密膜的方法, 以对推进剂燃烧具有催化作用的纳米膜取代了铝粉表面本身的惰性氧化层。分析了纳米膜包覆的形成机理, 并以此制备了纳米 SiO2/Al复合粒子。通过检测分析, 发现包覆前后颗粒粒度变化不明显, 包覆膜的厚度在 10 nm左右, 与铝粉本身的氧化层厚度相当;发现复合颗粒表面有Si—O—Si反对称伸缩振动峰及Si—O—Si弯曲振动吸收峰, 表明包覆膜为SiO2。

Nanometer SiO 2 film is coated on the activated micrometer Al powder.And the inertia oxidation layer of Al particle is replaced by the nanometer SiO 2 film,which has catalysis for the decomposition of propellant. Nanometer SiO 2/Al composite particle was prepared,based on the forming mechanism of nanometer film.The analysis results indicated that the coating thickness is about 10nm,quite corresponding with the oxidation thickness of Al powder. And the peaks of Si—O—Si are present in the FIR chart of the composite particle.