| 不同(Mo+B)/(Ni+Cr)质量比的原位合成MoB/NiCr涂层的组织结构与性能 |
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| 引用本文： | 陈枭,李承娣,周鸿凯,皮智敏,白小波.不同(Mo+B)/(Ni+Cr)质量比的原位合成MoB/NiCr涂层的组织结构与性能[J].稀有金属材料与工程,2021,50(9):3085-3093. |
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| 作者姓名： | 陈枭 李承娣 周鸿凯 皮智敏 白小波 |
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| 作者单位： | 新余学院 新余市智能制造材料技术与应用重点实验室，江西 新余 338004;九江学院 江西省表面绿色再制造工程技术中心，江西 九江 332005,新余学院 新余市智能制造材料技术与应用重点实验室，江西 新余 338004;大连海事大学 海底工程技术与装备国际联合研究中心，辽宁 大连 116026,新余学院 新余市智能制造材料技术与应用重点实验室，江西 新余 338004,新余学院 新余市智能制造材料技术与应用重点实验室，江西 新余 338004,九江学院 江西省表面绿色再制造工程技术中心，江西 九江 332005 |
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| 摘 要： | 采用超音速火焰喷涂技术沉积含3种不同(Mo+B)/(Ni+Cr)质量比（1:1，2:1和3:1）的Mo-B-Ni-Cr球磨复合粉末以原位反应制备获得MoB/NiCr涂层。采用扫描电子显微镜（SEM）和X射线衍射仪（XRD）分析了MoB/NiCr涂层的组织结构和物相。同时讨论了不同(Mo+B)/(Ni+Cr)质量比对涂层的组织结构、硬度、结合强度和耐腐蚀性能的影响。研究结果表明，(Mo+B)/(Ni+Cr)质量比为1：1的MoB/NiCr涂层孔隙率最低及涂层厚度最大。在3种涂层中均原位反应生成了Mo2NiB2三元硼化物，且随着(Mo+B)/(Ni+Cr)质量比的增加，涂层中三元硼化物含量随之增加，涂层的硬度值增加，结合强度反而随之降低；由于涂层中三元硼化物的原位生成，MoB/NiCr涂层的硬度值均高于316L不锈钢基体。通过能谱和XRD分析发现，经过360 h熔融锌腐蚀试验后，涂层表层中没有发现锌元素及其金属间化合物，然而随着(Mo+B)/(Ni+Cr)质量比的增加，涂层的孔隙率增加及厚度降低。最后，综合分析可得，相比其他涂层，(Mo+B)/(Ni+Cr)质量比为1:1的MoB/NiCr涂层具有更好的耐熔融锌腐蚀能力。
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| 关 键 词： | Mo2NiB2三元硼化物 超音速火焰喷涂 组织结构 硬度 耐腐蚀 |
| 收稿时间： | 2020/8/6 0:00:00 |
| 修稿时间： | 2020/9/12 0:00:00 |
Microstructure and Properties of In Situ Synthesized MoB/NiCr Coatings with Different (Mo+B)/(Ni+Cr) Mass Ratios |
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| Chen Xiao,Li Chengdi,Zhou Hongkai,Pi Zhimin and Bai Xiaobo.Microstructure and Properties of In Situ Synthesized MoB/NiCr Coatings with Different (Mo+B)/(Ni+Cr) Mass Ratios[J].Rare Metal Materials and Engineering,2021,50(9):3085-3093. |
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| Authors: | Chen Xiao Li Chengdi Zhou Hongkai Pi Zhimin and Bai Xiaobo |
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| Affiliation: | Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China;Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, Jiujiang University, Jiujiang 332005, China,Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China;National Center for International Research of Subsea Engineering Technology and Equipment, Dalian Maritime University, Dalian 116026, China,Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China,Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China,Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing, Jiujiang University, Jiujiang 332005, China |
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| Abstract: | Three kinds of Mo-B-Ni-Cr ball-milled mixture powders with different (Mo+B)/(Ni+Cr) mass ratios (1:1, 2:1, and 3:1) were deposited by the high velocity oxygen-fuel (HVOF) spraying process to in situ synthesize MoB/NiCr coatings. The microstructure and phase composition of MoB/NiCr coatings were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The effects of different (Mo+B)/(Ni+Cr) mass ratios on the microstructure, microhardness, bonding strength, and corrosion resistance of MoB/NiCr coatings were discussed. The results show that MoB/NiCr coatings with (Mo+B)/(Ni+Cr) mass ratio of 1:1 have the lowest porosity and the largest thickness. Mo2NiB2 ternary boride was in situ synthesized in all three kinds of MoB/NiCr coatings. The content of Mo2NiB2 ternary boride is increased with increasing the (Mo+B)/(Ni+Cr) mass ratio. The microhardness of MoB/NiCr coatings is increased with increasing the (Mo+B)/(Ni+Cr) mass ratio, while the bonding strength is decreased. After immersion test in molten zinc for 360 h, no zinc or its intermetallic compound can be observed in the surface region of MoB/NiCr coatings according to energy disperse spectrometer (EDS) and XRD analyses. The porosity of the coatings is increased with increasing the (Mo+B)/(Ni+Cr) mass ratio, while the thickness is decreased. Compared with other coatings, the MoB/NiCr coating with (Mo+B)/(Ni+Cr) mass ratio of 1:1 has better corrosion resistance in molten zinc. |
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| Keywords: | Mo2NiB2 ternary boride high velocity oxygen-fuel microstructure microhardness corrosion resistance |
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