快速凝固铝合金粉末表面氧化的研究

 应用光电子能谱(Electron Spectroscopy for Chemical Analysis)系统研究了快速凝固纯铝粉末及高强Al-7.52n-2.0Mg-2.0Cu,高温Al-4Mn-4Ni-0.6Mg-0.6Zr和超轻Al-3.2Li-1.1Mg-0.3Cu-0.2Zr合金粉末表面结构及氧化层厚度和组成,探讨了合金元素,粉末尺寸及储存条件对粉末表面结构及氧化状况的影响。

SURFACE OXIDATION OF RAPIDLY SOLIDIFIED ALUMINUM ALLOY POWDER

The structure, the thickness and the composition of the surface oxide layers for the rapidly solidified pure aluminum powder and high-strength Al-7.5Zn-2Mg-2Cu, high-temperature Al-4Mn-4Ni-0.6Mg-0.6Zr, super-light Al-3.2Li-l.lMg-0.3Cu-0.2Zr alloy powders have been studied by using ESCA (Electron Spectroscopy for Chemical Analysis) quantitatively. All the powders exhibit an outer hydrocarbon layer, a surface hydrous oxide layer and an oxide layer. The thickness of oxide layer, which is controlled by the diffusion of oxygen in oxide, is 40 A (consisting of AL2O3) for pure Al powders 35 A (consisting of A12O3) for Al-Mn-Ni-Mg-Zr powders and 37 A(consisting of A12O3 and MgO, A13+ : Mg2+ =1 : 0.06) for Al-Zn-Mg-Cu powders. The oxidation of Al-Li-Mg Cu-Zr powders is controlled by the transoportation of oxygen to the powder surface, which makes the thickness of oxide layer add to 97 A (consisting of A12O3, Li2O and MgO, A13+ : Li + : Mg2+ = 1 : 0.86 : 0.05) for 50-56μm size powders and 117 A(A13+: Li + : Mg2+ = 1 : 1.16:0.09) for 40μm size powders. The effects on the surface of exposure condition have been also studied in the paper.