Ti-6Al-4V微弧氧化陶瓷膜微观结构与组成研究

Structure and Composition of Surface and Interface of Micro-Arc Oxide Ceramic Layer on Ti-6Al-4V Alloy

摘要:

在NaAlO2，Na3PO4混合电解液中，利用微弧氧化（MAO）技术在Ti-6Al-4V合金表面制备了氧化物陶瓷膜。用扫描电镜（SEM），能量散射谱仪（EDS），X射线光电子能谱仪（XPS）对氧化物陶瓷膜的微观结构与组成进行了分析。结果表明：微弧氧化陶瓷膜表面和界面均呈现多孔结构，表面孔径大小差别较大，界面孔径大小差别较小，氧化膜界面处较规则地平行排列着一些长丘陵状突起；氧化膜疏松层与致密层无明显界限，氧化膜与基底以犬牙交错状结合。EDS分析结果表明，氧化膜表面、界面均由Ti，Al，P，V元素组成，Al元素易在表面富集，P元素易在界面富集。XPS分析结果表明，氧化膜表面、界面存在TiO2，Al2O3，TiAl2O5等相，P元素均以PO4^3-形式存在；氧化膜界面处存在V2O5相，而表面并不存在V元素。

Abstract:

Oxide ceramic layer was obtained on Ti-6Al-4V alloy in NaAlO_2, Na_3PO_4 mixed solution by micro-arc oxidation (MAO) technique. The structure and composition of MAO coatings were analyzed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The results show: the surface and interface have the porous structure, but the difference between the diameter of pores in surface is quite large, the difference in interface is quite small, and there are some long hill paralleled to each other in interface. There is no obvious boundary between the loose layer and dense layer. The interface between the substrate and MAO coatings has a z-zig structure. The surface and interface are composed of Ti, Al, V, P elements, and Al element is inclined to enrich in surface, but P element enriched in interface according to EDS results. TiO_2, Al_2O_3, TiAl_2O_5 phases are identified in surface and interface, and the P element exists in PO_4~(3-) radical according to XPS analysis. V_2O_5 phase can be found in the interface and V element does not exist in the surface according to XPS analysis.