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刘李,孙炫琪,陈子豪,等. 旋翼轴用Ni−Al2O3−PTFE复合镀层的制备与摩擦学性能[J]. 安徽工业大学学报(自然科学版),2024,41(3):276-286. doi: 10.12415/j.issn.1671-7872.24031
引用本文: 刘李,孙炫琪,陈子豪,等. 旋翼轴用Ni−Al2O3−PTFE复合镀层的制备与摩擦学性能[J]. 安徽工业大学学报(自然科学版),2024,41(3):276-286. doi: 10.12415/j.issn.1671-7872.24031
LIU Li, SUN Xuanqi, CHEN Zihao, DAI Qingwen, HUANG Wei, WANG Xiaolei. Preparation and Tribological Properties of Ni−Al2O3−PTFE Composite Coatings for Rotor Shaft[J]. Journal of Anhui University of Technology(Natural Science), 2024, 41(3): 276-286. DOI: 10.12415/j.issn.1671-7872.24031
Citation: LIU Li, SUN Xuanqi, CHEN Zihao, DAI Qingwen, HUANG Wei, WANG Xiaolei. Preparation and Tribological Properties of Ni−Al2O3−PTFE Composite Coatings for Rotor Shaft[J]. Journal of Anhui University of Technology(Natural Science), 2024, 41(3): 276-286. DOI: 10.12415/j.issn.1671-7872.24031

旋翼轴用Ni−Al2O3−PTFE复合镀层的制备与摩擦学性能

Preparation and Tribological Properties of Ni−Al2O3−PTFE Composite Coatings for Rotor Shaft

  • 摘要: 针对国内航空传动系统翻修间隔时间短的不足,以硬质颗粒Al2O3和润滑材料PTFE作为微粒,采用电刷镀技术在旋翼轴常用过渡层金属材料T2紫铜片表面,制备Ni−Al2O3,Ni−PTFE,Ni−Al2O3−PTFE复合镀层,采用扫描电镜、显微硬度仪表征分析镀层微观形貌、元素含量分布及硬度;采用自制的销盘式摩擦磨损试验机对镀层试样进行摩擦磨损试验,探究镀层摩擦学性能及其磨损机理。结果表明:随Al2O3颗粒含量的提高,Ni−Al2O3−PTFE复合镀层表面微晶单元尺寸减小,硬度提高,Ni−Al2O3−PTFE (3∶1)显微硬度最大为236 HV,相比于Ni−PTFE复合镀层提升约66%;Ni−Al2O3−PTFE复合镀层结合了Al2O3和PTFE两者的优势,在具有减摩的同时,还具有良好的耐磨性能,Ni−Al2O3−PTFE (1∶1)复合镀层的减摩性能最优,相比于Ni−Al2O3其摩擦系数降低约52%;Ni−Al2O3−PTFE (3∶1)复合镀层的耐磨性能最优,相比于Ni−PTFE其磨损率降低约85%;Ni−Al2O3−PTFE复合镀层的磨损形式主要是机械磨损,存在轻微的氧化磨损和黏着磨损,复合镀层表面微凸体的塑性变形可为摩擦表面提供润滑膜,其中PTFE是自润滑颗粒,Al2O3颗粒起到支撑与强化的作用,保护镀层免受磨损。

     

    Abstract: Aiming at the drawback of short repair intervals of domestic aviation transmission systems, the hard particles Al2O3 and lubrication material PTFE were used as particles, employed with the brush plating technology to prepare Ni−Al2O3, Ni−PTFE and Ni−Al2O3−PTFE composite coatings on the surface of T2 copper sheet, which is a commonly used transition layer metal material on the rotor shaft. Scanning electron microscopy and microhardness instruments were employed to characterize and analyze the microstructure, element content distribution, and hardness of the coatings. The friction and wear tests on the coated samples were conducted with a self-made pin plate friction and wear testing machin to explore the frictional properties and wear mechanism of the coating. The results show that with the increase of Al2O3 particle content, the surface microcrystalline unit size of Ni−Al2O3−PTFE decreases and the microhardness increases. The maximum microhardness of Ni−Al2O3−PTFE (3∶1) is 236 HV, which is about 66% higher than that of Ni−PTFE composite coating. The Ni−Al2O3−PTFE composite coating combines the advantages of Al2O3 and PTFE, which not only reduces friction, but also has excellent wear resistance. The anti-friction performance of Ni−Al2O3−PTFE (1∶1) composite coating is the best, with a friction coefficient reduction of about 52% compared to Ni−PTFE composite coating. The wear resistance of Ni−Al2O3−PTFE (3∶1) composite coating is the best, and its wear rate is reduced by about 85% compared to Ni−PTFE composite coating. The wear form of Ni−Al2O3−PTFE composite coating is mainly mechanical wear, with slight oxidative wear and adhesive wear. The micro-convex plastic deformation on the surface of composite coating can provide a lubrication film for the friction surface, of which PTFE is a self-lubricating particle, and Al2O3 particles play a role in supporting and strengthening the coating, preventing the coating from wear.

     

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