金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 176-181.DOI: 10.13251/j.issn.0254-6051.2021.04.032

• 表面工程 • 上一篇    下一篇

超音速火焰喷涂NiTi合金涂层的形状记忆效应

段学燕1, 李文利2, 覃恩伟1, 王博1, 陆海峰1, 吴树辉1   

  1. 1.苏州热工研究院有限公司 表面工程研究所, 江苏 苏州 215004;
    2.苏州大学 机电工程学院, 江苏 苏州 215004
  • 收稿日期:2020-10-11 出版日期:2021-04-25 发布日期:2021-05-08
  • 通讯作者: 李文利,副教授,博士,E-mail:wlli@suda.edu.cn
  • 作者简介:段学燕(1993—),女,硕士研究生,主要研究方向为功能材料表面改性,激光沉积成型,E-mail:16324469@qq.com。
  • 基金资助:
    国家重点研发计划(2016YFB1100200);苏州市重点产业技术创新(SGC201720)

Shape memory effect of NiTi alloy coating deposited by high-velocityoxygen-fuel spraying

Duan Xueyan1, Li Wenli2, Qin Enwei1, Wang Bo1, Lu Haifeng1, Wu Shuhui1   

  1. 1. Division for Surface Technology and Engineering, Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou Jiangsu 215004, China;
    2. School of Mechanical and Electric Engineering, Suzhou University, Suzhou Jiangsu 215004, China
  • Received:2020-10-11 Online:2021-04-25 Published:2021-05-08

摘要: 采用超音速火焰喷涂制备超致密NiTi合金涂层,通过后续热处理获得优化相变结构,并通过压痕法分析涂层的形状记忆效应。光学显微镜及扫描电镜对NiTi合金涂层微观结构表征显示,喷涂制备态涂层由内部岛状-链状界面叠片组成,涂层致密孔隙率约为0.82%。X射线衍射分析显示,NiTi涂层制备态为全奥氏体,经时效处理析出Ni4Ti3相。压痕法分析表明,在制备态及时效态涂层中均获得了一定的单程及双程形状记忆效应。X射线物相分析及差示扫描量热仪对比分析揭示,时效析出的第二相粒子显著增加形状记忆效应。

关键词: NiTi合金, 形状记忆效应, 超音速火焰喷涂, 压痕法

Abstract: A highly dense NiTi alloy coating was prepared by high-velocity oxygen-fuel (HVOF) spraying, and the microstructure was optimized by subsequent aging treatment. The shape memory effects of the as-HVOF sprayed and as-aged specimens were evaluated through an indentation method. The OM and SEM microstructural characterization show that the as-sprayed NiTi coating consists of laminated internal island-chain interfaces, with a porosity of about 0.82%. The X-ray diffraction analysis shows that the as-sprayed NiTi coating owns 100% austenite, from which the Ni4Ti3 phase precipitates out in aging treatment. The indentation analysis shows that both the one-way and the two-way shape memory effects can be induced in the as-sprayed and the aged coatings, while the X-ray phase analysis and the differential scanning calorimetry analysis show that the shape memory effect is significantly increased by the precipitated second phase particles in aging treatment.

Key words: NiTi alloy, shape memory effect, high-velocity oxygen-fuel spraying, indentation method

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