Phase composition, morphology and element contents of micro-arc oxidation ceramic coatings on Ti–6Al–4V alloy under different calcination conditions
来源期刊：Rare Metals2016年第11期
论文作者：Guo-Dong Hao Xue-long Hao Zu-Fang Zhu
文章页码：836 - 840
摘 要：Compound ceramic coatings with the main crystalline of Al2TiO5（in the as-prepared coating without treatment） were prepared in situ on the surface Ti–6Al–4V alloy by means of pulsed bipolar micro-arc oxidation in Na AlO2 solution. For the purpose of studying the antioxidation properties of the samples, the coated samples treated in argon and the as-coated samples were calcined in air at 1000 °C. And the related characteristics were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and X-ray fluorescence（XRF） spectroscopy, respectively. The results show that, when it was calcined in air for 1 h, Al2TiO5in the as-prepared coating decomposed and transformed into α-Al2O3 and rutile TiO2.However, after almost 4 h in argon, Al2TiO5in the asprepared coating decomposed and the final coating surface contents are completely α-Al2O3, and those of the middle interface are mainly Al2O3 and Ti2O3. The morphologies of the coatings after calcination in argon and air are different.High-temperature oxidation occurred violently in the alloy substrate without coatings. Furthermore, the weight gain curves of the as-prepared samples and the coated samples treated in argon both show a parabolic shape.
Guo-Dong Hao1，Xue-long Hao2，Zu-Fang Zhu2
1. Department of Chemistry,Mudanjiang Normal University2. National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials,General Research Institute for Nonferrous Metals
摘 要：Compound ceramic coatings with the main crystalline of Al2TiO5（in the as-prepared coating without treatment） were prepared in situ on the surface Ti–6Al–4V alloy by means of pulsed bipolar micro-arc oxidation in Na AlO2 solution. For the purpose of studying the antioxidation properties of the samples, the coated samples treated in argon and the as-coated samples were calcined in air at 1000 °C. And the related characteristics were investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and X-ray fluorescence（XRF） spectroscopy, respectively. The results show that, when it was calcined in air for 1 h, Al2TiO5in the as-prepared coating decomposed and transformed into α-Al2O3 and rutile TiO2.However, after almost 4 h in argon, Al2TiO5in the asprepared coating decomposed and the final coating surface contents are completely α-Al2O3, and those of the middle interface are mainly Al2O3 and Ti2O3. The morphologies of the coatings after calcination in argon and air are different.High-temperature oxidation occurred violently in the alloy substrate without coatings. Furthermore, the weight gain curves of the as-prepared samples and the coated samples treated in argon both show a parabolic shape.
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