The effect of chromium on the gamma to alpha phase transition of alumina coating formed on 316L SS by a cathodic micro arc deposition (CMAD) process
The effect of chromium on the gamma to alpha phase transition of alumina coating formed on 316L SS by a cathodic micro arc deposition (CMAD) process
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铬对通过阴极微弧沉积 (CMAD) 工艺在 316L 不锈钢上形成的氧化铝涂层的 γ 到 α 相变的影响
DOI：
10.1016/j.surfcoat.2014.12.072
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发表时间：
2015-02
影响因子：
5.4
通讯作者：
Chen Yixiang
中科院分区：
文献类型：
--
作者：
Zeng Cheng;Ling Yunhan;Li Shantong;Rao Yongchu;Chen Yixiang
氧化铝陶瓷涂层由于其良好的物理和化学稳定性而被广泛应用。然而，在较低温度下在金属基材上形成稳定的α相氧化铝仍然存在技术挑战。采用阴极微弧沉积（CMAD）技术，以Al（NO3）3为前驱体，在316L不锈钢表面成功制备了Cr掺杂Al 2 O3陶瓷涂层。我们研究了铬对其从γ到α相变的影响以及潜在的机制。通过X射线衍射（XRD）、电子探针（EPMA）、扫描电子显微镜（SEM）、能谱仪（EDS）和显微共焦拉曼光谱仪（MCRS）对样品的物相和化学成分分布、表面形貌和光致发光数据进行了表征。结果表明，陶瓷涂层具有多孔结构，主要由Cr掺杂的α-Al 2 O3和γ-Al 2 O3组成。这表明，Cr的引入促进了α-Al 2 O3陶瓷相的形核和生长。基于常规的热处理的氧化铝沉淀物的比较，通过溶胶-凝胶过程中，有和没有铬掺杂剂，我们提出，还原气氛和局部高火花温度，随后提高了氧化物中的缺陷的扩散可能有助于这种转变。这一发现可能提供一种简单，成本有效的方法，在温和的温度下在金属基体上制备氧化铝涂层，而不牺牲其机械性能。
Alumina ceramic coatings are widely used because of their favorable physical and chemical stability. However, the formation of stable alpha phase alumina on metallic substrates at lower temperatures still presents technical challenges. In this work, an Cr doped Al2O3ceramic coating was successfully fabricated on 316L stainless steel by a new cathodic micro-arc deposition (CMAD) technique using Al(NO3)3as the precursor. We studied the effect of chromium on its phase transition from gamma to alpha as well as the underlying mechanism. Phase and chemical composition distribution, surface morphology, and photoluminescence data were characterized by X-ray diffraction (XRD), electron probe microanalysis (EPMA), a scanning electron microscope (SEM) with an energy dispersive spectroscopy (EDS), and a microscopic confocal Raman spectrometer (MCRS). The results showed that the ceramic coatings have a porous microstructure and were mainly composed of Cr doped α-Al2O3and γ-Al2O3. This suggests that the introduction of Cr in the electrolyte solution can promote the nucleation and growth of the corundum phase of α-Al2O3. Based on the comparison of conventional heat treatment of alumina precipitates with and without Cr dopant via a sol–gel process, we proposed that the reducing atmosphere and local high sparking temperature that subsequently enhances the diffusion of defects in oxides may be contributed to this transition. This finding might provide a simple, cost efficient way to fabricate corundum alumina coatings on metallic substrates under mild temperatures without sacrifice of its mechanical properties.
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影响因子：
1.3
作者：
W. Hayes
通讯作者：
W. Hayes
DOI：
10.1088/0022-3727/43/1/015302
发表时间：
2010-01
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
L. C. Cossolino;A. Zanatta
通讯作者：
L. C. Cossolino;A. Zanatta
影响因子：
6.7
作者：
Yunlong Wang;Zhaohua Jiang;Xinrong Liu;Zhongping Yao
通讯作者：
Yunlong Wang;Zhaohua Jiang;Xinrong Liu;Zhongping Yao
影响因子：
1.7
作者：
Guikai Zhang;C. A. Chen;D. Luo;Xiaolin Wang
通讯作者：
Guikai Zhang;C. A. Chen;D. Luo;Xiaolin Wang
影响因子：
3.1
作者：
W. Krauss;J. Konys;N. Holstein;H. Zimmermann
通讯作者：
W. Krauss;J. Konys;N. Holstein;H. Zimmermann