佘功浩,张怡颖,韩兆康,刘志凯,张留艳,揭晓华,谭桂斌,莫卢亮.石墨烯增强冷喷涂-阳极氧化铝基复合涂层的微观组织及摩擦性能研究[J].表面技术,2024,53(21):133-141.
SHE Gonghao,ZHANG Yiying,HAN Zhaokang,LIU Zhikai,ZHANG Liuyan,JIE Xiaohua,TAN Guibin,MO Luliang.Microstructure and Friction Properties of Graphene Reinforced Cold Spraying-anodized Alumina Matrix Composite Coating[J].Surface Technology,2024,53(21):133-141 |
| 石墨烯增强冷喷涂-阳极氧化铝基复合涂层的微观组织及摩擦性能研究 |
| Microstructure and Friction Properties of Graphene Reinforced Cold Spraying-anodized Alumina Matrix Composite Coating |
| 投稿时间：2023-11-06 修订日期：2024-03-04 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.21.014 |
| 中文关键词: 石墨烯 冷喷涂 阳极氧化 耐磨性 自润滑 复合涂层 |
| 英文关键词:graphene cold spraying anodic oxidation wear resistance self-lubrication composite coating |
| 基金项目:广东省基础与应用基础研究基金(2022A1515240004);广州市科技计划(2023A04J0270) |
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| Author | Institution |
| SHE Gonghao | School of Materials and Energy,Guangzhou 510006, China |
| ZHANG Yiying | School of Materials and Energy,Guangzhou 510006, China |
| HAN Zhaokang | School of Materials and Energy,Guangzhou 510006, China |
| LIU Zhikai | School of Materials and Energy,Guangzhou 510006, China |
| ZHANG Liuyan | School of Materials and Energy,Guangzhou 510006, China ;Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology for Marine Energy Facilities, Guangdong University of Technology, Guangzhou 510006, China |
| JIE Xiaohua | School of Materials and Energy,Guangzhou 510006, China |
| TAN Guibin | Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology for Marine Energy Facilities, Guangdong University of Technology, Guangzhou 510006, China |
| MO Luliang | School of Materials and Energy,Guangzhou 510006, China |
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| 中文摘要: |
| 目的 增强冷喷涂铝合金-阳极氧化复合涂层的耐磨性能，充分利用二维层状石墨烯优异的润滑特性，探究石墨烯对复合涂层相关性能的作用机理。方法 采用超声分散和磁力搅拌的方法，利用铝粉的还原性将氧化石墨烯原位还原为还原氧化石墨烯(rGO)，将其包覆在7075Al合金颗粒的表面，通过冷喷涂和阳极氧化的复合工艺将铝合金的阳极氧化工艺“移植”到钢材表面，制备出7075Al-AAO和G/7075Al-AAO两种复合涂层。通过扫描电子显微镜SEM、X射线衍射、X射线能谱、拉曼光谱等手段分析涂层的形貌、成分、结构，开展涂层的硬度和摩擦磨损试验，最后通过SEM、3D激光共聚焦法观察磨痕形貌，并计算磨损率。结果 7075Al-AAO涂层的硬度为208.1HV0.1，而G/7075Al-AAO涂层的硬度为319.1HV0.1，相较于经石墨烯改性前涂层的硬度提高了53.3%;G/7075Al-AAO涂层表现出更低的磨损率(4.42×10–4 mm3.N–1.m–1)和更小的摩擦因数(约为0.2)，其磨损率相对于改性前涂层降低了近45%，摩擦因数仅为改性前涂层的1/2。结论 经过石墨烯包覆改性与复合工艺处理后制备的G/7075Al-AAO涂层具有更高的硬度，更优异的减摩和耐磨性，这归因于原位转移并均匀分散于阳极氧化膜中的rGO增强了涂层的致密性和结合力，同时发挥了高强度和润滑减摩特性。石墨烯原位包覆改性及冷喷涂复合阳极氧化技术对高性能铝基耐磨涂层制备具有技术指导意义。 |
| 英文摘要: |
| In order to improve the wear resistance of the cold sprayed aluminum alloy-anodic oxidation composite coating and make full use of the excellent lubrication performance of graphene, the mechanism of graphene on the related properties of the composite coating was further studied and analyzed. Reduced graphene oxide (rGO) was prepared by the chemical in-situ reduction method. The coating effect of 7075 aluminum alloy powder particles was produced by ultrasonic dispersion and magnetic stirring. The anodic oxidation process of aluminum alloy was "transplanted" to the steel surface by combining the cold spraying technology and the anodic oxidation process. Two composite coatings of 7075Al-AAO and G/7075Al-AAO were prepared to improve the surface structure and wear resistance of steel. The structure and morphology of rGO and the surface interface of the composite coating were characterized and analyzed by scanning electron microscopy (SEM). The composition and structure of the composite coating were analyzed by X-ray diffraction analysis (XRD), X-ray energy spectrum analysis (EDS) and Raman spectroscopy, and the micro-hardness of different composite coatings was tested by hardness tester. Finally, the wear morphologies of the two coatings, as well as their wear rate, were studied and analyzed by 3D confocal laser scanning microscope (CLSM), etc., after the ball and disk friction and wear test. It was proved that the wear resistance of the material surface performed better after the coating prepared by redox graphene coating and composite process. On the basis of improving the surface micro-hardness of the material, the addition of graphene could play a self-lubricating role in the friction and wear interface, thus producing a protective effect. Compared with the 7075Al-AAO coating, the G/7075Al-AAO composite coating had higher micro-hardness (average value of 319.1HV0.1), lower wear rate (4.42×10−4 mm3.N−1.m−1) and smaller friction coefficient (average friction coefficient of about 0.2), and its wear scar width was also relatively small (518.3 μm). Under the same loading time and pressure, the micro-hardness of the steel substrate was only 188.7HV0.1, and the micro-hardness of the 7075Al-AAO coating was 208.1HV0.1. The average micro-hardness of the G/7075Al-AAO composite coating was 10.3% and 53.3% higher than that of the two coatings respectively. And the wear rate was reduced by nearly 45% compared with the 7075Al-AAO coating, and the friction coefficient was only 1/4 and 1/2 of the former two under the same load, respectively. Based on the above experimental data and phenomena, combined with the micro-structure changes observed during the experiment, some rules and conclusions could be obviously summarized. Reduced oxidation graphene was successfully coated on the surface of the aluminum alloy powder by uniform dispersion and magnetic adsorption, so that the rGO could be therefore transferred to the anodic oxide film in situ during the anodic oxidation process next. The addition of rGO can effectively improve the micro-hardness, wear resistance, anti-friction and self-lubricating properties of the composite coating, and at the same time make the coating have good compactness and adhesion. The anodic oxidation process of rGO coating structure has a good promotion effect on the inhibition of the wear process of the composite coating, which greatly improves the friction performance of the composite coating. |
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