| 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],53(21):133-141 |
| Microstructure and Friction Properties of Graphene Reinforced Cold Spraying-anodized Alumina Matrix Composite Coating |
| Received:November 06, 2023 Revised:March 04, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.21.014 |
| KeyWord:graphene cold spraying anodic oxidation wear resistance self-lubrication composite coating |
| Author | Institution |
| SHE Gonghao |
School of Materials and Energy,Guangzhou , China |
| ZHANG Yiying |
School of Materials and Energy,Guangzhou , China |
| HAN Zhaokang |
School of Materials and Energy,Guangzhou , China |
| LIU Zhikai |
School of Materials and Energy,Guangzhou , China |
| ZHANG Liuyan |
School of Materials and Energy,Guangzhou , China ;Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology for Marine Energy Facilities, Guangdong University of Technology, Guangzhou , China |
| JIE Xiaohua |
School of Materials and Energy,Guangzhou , China |
| TAN Guibin |
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology for Marine Energy Facilities, Guangdong University of Technology, Guangzhou , China |
| MO Luliang |
School of Materials and Energy,Guangzhou , China |
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| Abstract: |
| 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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