自修复微胶囊对UHMWPE复合材料的摩擦学性能影响  

Effect of self-healing microcapsules on the tribological properties of UHMWPE composites

作　　者：杨宗榕 郭智威[1,2] 袁成清[1,2] 白秀琴[1,2] 王超宝 YANG zongrong;GUO zhiwei;YUAN chengqing;BAI xiuqin;WANG chaobao(State Key Laboratory of Maritime Technology and Safety,Wuhan University of Technology,Wuhan 430063,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]武汉理工大学水路交通控制全国重点实验室,武汉430063 [2]武汉理工大学交通与物流工程学院,武汉430063 [3]陕西科技大学机电工程学院,西安710021

出　　处：《清华大学学报(自然科学版)》2025年第2期312-324,共13页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金面上项目(52275209,52171319)。

摘　　要：水润滑尾轴承在低速和重载工况条件下容易产生严重磨损与表面微缺陷。通过使用自修复微胶囊作为填料,赋予复合材料内部微缺陷的自修复能力,可以改善超高分子量聚乙烯(UHMWPE)水润滑尾轴承的使役性能。联用Pickering法与原位聚合法来制备含有活性异氟尔酮二异氰酸酯(IPDI)的自修复微胶囊,以硅烷交联改性UHMWPE来制备含自修复微胶囊的UHMWPE复合材料,探究不同的自修复微胶囊添加量对复合材料的机械性能、摩擦学性能及自修复性能的影响。测试结果表明:微胶囊的加入降低了复合材料的机械性能和摩擦学性能,微胶囊含量越高这2种性能下降越多。与此同时随着微胶囊含量的提升,复合材料自修复性能越好。综合考虑自修复微胶囊含量对复合材料的这3种性能的影响,当微胶囊含量达到10%时复合材料的综合性能达到最佳,为设计优异使役性能的新型水润滑轴承材料提供了参考。[Objective]The water-lubricated tail bearing is a critical component of a ship's propulsion system.Its stability and reliability significantly affect the safety of ship operations.Under low-speed,heavy-load conditions,forming a stable hydrodynamic lubrication water film becomes challenging,often resulting in poor lubrication.This can cause micro-defects on the composite material's surface.To address this,microcapsules containing diisocyanate are incorporated into the composite material,enabling it to autonomously repair such micro-defects.This study explores how the mass fraction of self-healing microcapsules affects the self-repairing ability, mechanical properties, and tribological performance while also analyzing theunderlying mechanisms. [Methods] Self-healing microcapsules containing active IPDI self-healing agents were prepared using acombination of Pickering emulsion and in situ polymerization methods. Composite materials infused with these microcapsuleswere then fabricated using hot pressing. The mechanical properties of the composites were analyzed using differential scanningcalorimetry, dynamic mechanical analysis, and mechanical performance tests. Scratch tests were employed to assess theself-repairing capabilities of the composites, while an Rtec tribometer was used to evaluate their tribological properties. Theworn surfaces were examined using a scanning electron microscope and laser confocal microscopy. [Results]The addition ofself-healing microcapsules negatively impacted the mechanical properties of the composite materials as the microcapsule massfraction increased. Specifically, the crystallinity of the composites containing 5%, 10%, and 15% microcapsules decreased to9.87%, 12.37%, and 14.50%, respectively, compared to UHMWPE-1. The storage modulus decreased by 28.33%,31.8%, and 38.61% while bending strength decreased by 13.56%, 18.29%, and 26.58%. When the microcapsule massfraction exceeded 10%, the decline in mechanical properties accelerated. This was attributed to poor microcapsule dispersion

关 键 词：水润滑尾轴承 微胶囊结构 摩擦学性能 自修复微胶囊 

分 类 号：U664.21[交通运输工程—船舶及航道工程] TH117.1[交通运输工程—船舶与海洋工程]