热氧化环境对微米铝镁合金粉活性的影响

为研究热氧化环境对微米铝镁合金粉活性的影响，研究了雾化微米铝镁合金粉71℃热氧化作用下粒度及铝镁比对活性影响的变化规律，同时通过建模对样品的氧化壳厚度变化进行计算.使用激光粒度仪、扫描电镜及能谱仪、X光透射扫描等手段，对雾化微米铝镁合金粉进行粒度、形貌、成分测试，利用气体容量法对热氧化后合金粉的活性变化进行研究.结果表明，在71℃热氧化环境中，雾化微米铝镁合金粉的活性随粒度增加而降低，随铝镁合金比的升高而降低，但在氧化24 h后，其活性基本保持稳定. 

Influence of Heating Oxidation on Activity of Micron-Sized Mg-Al Alloy Powders

In order to find out the influence of heating oxidation on the activation change of the micron-sized Mg-Al alloy powder, the effect of particle size and Al/Mg ratio on the activity of the alloy at 71℃ was investigated. And the variation of oxide shell thickness was calculated at the same time. The particle size, morphology and composition of the atomized micron aluminum-magnesium alloy powder were tested by the laser particle size analyzer, the scanning electron microscope, the energy dispersive spectrometer and the X-ray transmission scanning. The gas volumetric method was used to measure the activity of the alloy powder after the thermal oxidation test. The results show that the activities of the atomized micron Al-Mg alloy powder decreased with the increase of particle size and decreased with the increase of Al-Mg-Al alloy ratio at 71℃. The activities of the Al-Mg alloy powder remained almost stable after 24 hours of oxidation.