| TiAl合金表面激光重熔MCrAlY涂层热腐蚀性能 |
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| 引用本文： | 王东生,田宗军,沈理达,黄因慧.TiAl合金表面激光重熔MCrAlY涂层热腐蚀性能[J].焊接学报,2014,35(8):17-20. |
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| 作者姓名： | 王东生 田宗军 沈理达 黄因慧 |
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| 作者单位： | 1.南京航空航天大学机电学院, 南京 210016;铜陵学院机械工程学院, 铜陵 244000 |
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| 基金项目： | 国家自然科学基金资助项目(51205198,21171131);中国博士后科学基金面上资助项目(2012M511266);安徽省自然科学基金资助项目(1208085QE84);铜陵学院2014年度校学术带头人及后备人选科研项目(2014tlxyxs03) |
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| 摘 要： | 采用等离子喷涂技术在TiAl合金表面制备了MCrAlY涂层,并用激光重熔工艺对涂层进行处理,研究了TiAl合金、等离子喷涂MCrAlY涂层及激光重熔MCrAlY涂层850℃下75%Na2SO4+25%NaCl(质量分数)混合盐浸泡热腐蚀性能,分析了不同试样的热腐蚀破坏机理,并讨论了激光重熔处理对涂层热腐蚀性能的影响.结果表明,等离子喷涂MCrAlY涂层能显著提高TiAl合金的耐热腐蚀性能,经过激光重熔后可进一步提高其耐热腐蚀性能.MCrAlY涂层在高温熔盐中的热腐蚀发生的是表面氧化反应和内部硫化反应,主要生成Al2O3,Cr2O3,NiO,NiCr2O4,Ni3S2及CrS等腐蚀产物.
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| 关 键 词： | 激光重熔 等离子喷涂 MCrAlY涂层 TiAl合金 热腐蚀性能 |
| 收稿时间： | 2013/2/26 0:00:00 |
Hot corrosion resistance of plasma-sprayed MCrAlY coatings by laser remelting on TiAl alloy surface |
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| WANG Dongsheng,TIAN Zongjun,SHEN Lida and HUANG Yinhui.Hot corrosion resistance of plasma-sprayed MCrAlY coatings by laser remelting on TiAl alloy surface[J].Transactions of The China Welding Institution,2014,35(8):17-20. |
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| Authors: | WANG Dongsheng TIAN Zongjun SHEN Lida and HUANG Yinhui |
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| Affiliation: | 1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;College of Mechanical Engineering, Tongling University, Tongling 244000, China2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | The MCrAlY coatings were prepared by plasma spraying on TiAl alloy surface, laser remelting experiment had been carried out and the hot corrosion resistance of TiAl alloy, plasma-sprayed and laser-remelted MCrAlY coatings in 5%Na2SO4+25% NaCl(mass fraction) molten salt at 850℃ were researched. The hot corrosion failure mechanisms of three kinds of materials were analyzed and the influence of laser remelting on hot corrosion behavior of plasma-sprayed MCrAlY coating were discussed. The results show that the plasma-spayed MCrAlY coating has better oxidation resistance than the original TiAl alloy, and the laser-remelted coating has the best oxidation resistance. The hot corrosion of MCrAlY coating included surface oxidation and internal sulfide, and produced Al2O3, Cr2O3, NiO, NiCr2O4, Ni3S2 and CrS et al. |
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| Keywords: | laser remelting plasma spraying MCrAlY coating TiAl alloy hot corrosion resistance |
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