Liu Hongtao, Li Zhixiong, Wang Jianmei, Sheng Chenxing, Liu Wanli
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 22110, China.
School of Mechatronics Engineering, China University of Mining and Technology, Xuzhou 22110, China.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2152-2157. doi: 10.1166/jnn.2018.14285.
Sliding bearing maintenance is crucial for reducing the cost and extending the service life. An efficient and practical solution is to coat a restorative agent onto the worn/damaged bearings. Traditional pure-copper (Cu) coating results in a soft surface and poor abrasion resistance. To address this issue, this paper presents a nano-composite repairing coating method. A series of nano-Al/Cu coatings were prepared on the surface of 45 steel by composite electro-brush plating (EBP). Their micro-hardness was examined by a MHV-2000 Vickers hardness tester, and tribological properties by a UMT-2M Micro-friction tester, 3D profiler and SEM. Then, the influence of processing parameters such as nano-particle concentration and coating thickness on the micro-hardness of nano-Al/Cu coating was analyzed. The experimental analysis results demonstrate that, when the nano-Al particle concentration in electrolyte was 10 g/L, the micro-hardness of the composite coating was 1.1 times as much as that of pure-Cu coating. When the Al nano-particle concentration in electrolyte was 20 g/L, the micro-hardness of the composite coating reached its maximum value (i.e., 231.6 HV). Compared with the pure-Cu coating, the hardness and wear resistance of the nano-composite coating were increased, and the friction coefficient and wear volume were decreased, because of the grain strengthening and dispersion strengthening. The development in this work may provide a feasible and effective nano-composite EBP method for sliding bearing repair.
滑动轴承维护对于降低成本和延长使用寿命至关重要。一种高效实用的解决方案是在磨损/损坏的轴承上涂覆修复剂。传统的纯铜（Cu）涂层会导致表面柔软且耐磨性差。为了解决这个问题，本文提出了一种纳米复合修复涂层方法。通过复合电刷镀（EBP）在45钢表面制备了一系列纳米Al/Cu涂层。用MHV - 2000维氏硬度计检测其显微硬度，用UMT - 2M微摩擦测试仪、三维轮廓仪和扫描电子显微镜检测其摩擦学性能。然后，分析了纳米颗粒浓度和涂层厚度等工艺参数对纳米Al/Cu涂层显微硬度的影响。实验分析结果表明，当电解液中纳米Al颗粒浓度为10 g/L时，复合涂层的显微硬度是纯Cu涂层的1.1倍。当电解液中Al纳米颗粒浓度为20 g/L时，复合涂层的显微硬度达到最大值（即231.6 HV）。由于晶粒强化和弥散强化，纳米复合涂层与纯Cu涂层相比，硬度和耐磨性提高，摩擦系数和磨损量降低。这项工作的进展可能为滑动轴承修复提供一种可行且有效的纳米复合电刷镀方法。
