The effects of current density on the phase composition and microstructure properties of micro-arc oxidation coating
The effects of current density on the phase composition and microstructure properties of micro-arc oxidation coating
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DOI：
10.1016/s0925-8388(02)00289-x
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发表时间：
2002-10
影响因子：
6.2
通讯作者：
Yang Guangliang;Lü Xian-Yi;Bai Yi-zhen;Cui Haifeng;Jin Zeng-sun
中科院分区：
文献类型：
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作者：
Yang Guangliang;Lü Xian-Yi;Bai Yi-zhen;Cui Haifeng;Jin Zeng-sun
采用微弧氧化（MAO）技术在铝合金基体上合成陶瓷涂层。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱(EDX)和显微硬度测试研究了电流密度对MAO涂层机械和化学性能的影响。高电流密度制备的样品主要由α-Al2O3组成，而低电流密度制备的样品几乎由γ-Al2O3组成。从涂层表面到基体不同深度的 XRD 分析表明，α-Al2O3 含量随深度的变化存在复杂的变化，这与其他研究的结果不同。显微硬度测试表明该类样品具有较高的硬度。然而，在平行于基底的平面内，高电流密度沉积的样品存在不均匀的硬度分布，这可归因于孔在平行于基底的同一平面内的不均匀分布。
Ceramic coatings have been synthesized on the Al alloy substrate by micro-arc oxidation (MAO) technique. The effects of current density on the mechanical and chemical properties of MAO coatings have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), and micro-hardness test. The samples fabricated at high current density consist mainly of α-Al2O3, while the samples fabricated at low current density are almost composed of γ-Al2O3. XRD analysis at different depths from coating surface towards substrate indicates that there is a complicated variation of α-Al2O3content as a function of depth, which is different from the results of others. Micro-hardness test shows that these kinds of samples have high hardness. However, in the plane parallel to the substrate, there is a non-uniform distribution of hardness for the samples deposited at high current density, which can be attributed to the non-uniform distribution of pores in the same plane parallel to the substrate.