Microstructure and Phase Composition of Microarc Oxidation Coatings Formed on Ti–6Al–4V Alloy in Aluminate Solution
Microstructure and Phase Composition of Microarc Oxidation Coatings Formed on Ti–6Al–4V Alloy in Aluminate Solution
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DOI：
10.1179/026708401101517953
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发表时间：
2001-08
影响因子：
2.8
通讯作者：
W. Xue;Z. Deng;H. Ma;R. Chen;T. Zhang
中科院分区：
文献类型：
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作者：
W. Xue;Z. Deng;H. Ma;R. Chen;T. Zhang
在铝酸盐溶液中，采用交流微弧氧化技术在Ti-6Al-4V合金表面制备了厚度约为50µm的致密陶瓷氧化物涂层。用X射线衍射仪(XRD)和扫描电子显微镜(SEM)结合能谱仪(EDS)对其微观结构和物相组成进行了分析。氧化物涂层包括两层：外层和致密的内层。涂层主要由金红石和TiAl2O5尖晶石相组成。在外层涂层中，TiAl2O5组分远高于金红石组分。而在内层，金红石成为主相，TiAl2O5含量显著减少。在微弧氧化过程中，涂层发生了局部熔融凝固过程，但涂层/金属界面附近的Ti-6Al-4V基片的组织结构没有改变。溶液中的铝在外层涂层中丰富，尽管它也扩散到涂层内部。
A dense ceramic oxide coating, about 50 µm thick, was prepared on a Ti–6Al–4V alloy by alternating current microarc oxidation in an aluminate solution. Its microstructure and phase composition were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The oxide coating contains two layers: an outer layer and a dense internal layer. The coating is mainly composed of TiO2 rutile and TiAl2O5 spinel phases. In the outer layer coating, the TiAl2O5 fraction is much higher than the rutile fraction. However, in the internal layer, rutile becomes the main phase while the TiAl2O5 fraction decreases significantly. During microarc oxidation, local melt–solidification processes take place in the coating, however, the microstructure of the Ti–6Al–4V substrate near the coating/metal interface is not changed. Aluminium from the solution is enriched in the outer layer coating, although it has also diffused into the interior of the coating.