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γ-TiAl合金表面Al2O3/Al复合涂层的抗高温熔盐腐蚀性能研究
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南京航空航天大学,南京航空航天大学,南京航空航天大学,南京航空航天大学,南京航空航天大学,南京航空航天大学,南京航空航天大学,南京航空航天大学

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国家自然科学基金资助项目(51474131)


Enhanced high temperature corrosion resistance of Al2O3/Alcomposite coating on γ-TiAl alloy
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College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road

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    摘要:

    采用磁控溅射技术于γ-TiAl合金表面制备Al2O3/Al复合涂层。在850 °C下、 100 wt.% Na2SO4熔盐中观测Al2O3/Al复合涂层的高温腐蚀行为。结果表明,Al2O3/Al复合涂层具备由Al2O3表层、富Al中间层以及互扩散层组成的梯度结构,因而有效地提高了基体γ-TiAl合金的抗高温腐蚀性能。在腐蚀实验后,涂层试样表面相结构为Al2O3,TiO2和TiAl3。致密的Al2O3/Al复合涂层有效地抑制了O2-,S-和Na+对基体γ-TiAl合金的侵蚀。并且,Al2O3/Al复合涂层的梯度结构亦使其表现出了优异的抗开裂和抗剥落性能。

    Abstract:

    γ-TiAl specimens were coated with an Al2O3/Al composite coating using magnetron sputtering. The corrosion resistance of the coated specimens were investigated in molten salt environment of 100 wt.% Na2SO4at 850 °C. Al2O3/Al composite coating improved the high temperature corrosion resistance of γ-TiAl alloy effectively. This good resistance was attributable to the gradient structure of Al2O3/Al composite coating which consist of an Al2O3 top-layer, an Al-rich interlayer and a diffusion layer. The results of corrosion test revealed that the Al2O3, TiO2 and TiAl3 were identified as the main phase structure of the corroded coating surface. Moreover, the sealed coating structure could effectively suppress the erosion of O2-, S- and Na+, while Al2O3/Al coating with gradient structure exhibited superior crack and spallation resistance.

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徐一,梁文萍,缪强,王玲,任蓓蕾,崔世宇,夏金姣,姚正军.γ-TiAl合金表面Al2O3/Al复合涂层的抗高温熔盐腐蚀性能研究[J].稀有金属材料与工程,2018,47(4):1075~1081.[Xu Yi, Liang Wenping, Miao Qiang, Wang Ling, Ren Beilei, Cui Shiyu, Xia Jinjiao, Yao Zhengjun. Enhanced high temperature corrosion resistance of Al2O3/Alcomposite coating on γ-TiAl alloy[J]. Rare Metal Materials and Engineering,2018,47(4):1075~1081.]
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  • 收稿日期:2016-05-13
  • 最后修改日期:2016-07-18
  • 录用日期:2016-08-18
  • 在线发布日期: 2018-05-31
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