ATP改性UHMWPE水润滑轴承材料的摩擦学特性研究

超高分子量聚乙烯(UHMWPE)轴承材料在低速重载工况下常发生严重磨损，通过添加改性填料能够显著提升其摩擦学性能. 凹凸棒土(ATP)作为一种改性填料能够增强基体材料的机械性能进而改善其摩擦特性，但是ATP作为填料往往会因为团聚效应而降低材料的补强效果. 通过对ATP进行表面改性处理可克服团聚效应，实现ATP与基体间的均匀共混. 通过表面化学包覆改性法制备由硅烷偶联剂KH570改性处理的ATP与UHMWPE共混制成复合材料，并与纯UHMWPE材料作对照试验. 利用RTEC摩擦试验机研究复合材料在水润滑条件下摩擦系数随载荷和转速的变化，以及材料填充含量对复合材料在低速重载(v=0.55 m/s、Fz=55 N)工况下磨损性能的影响. 利用傅里叶变换红外光谱仪(FTIR)、X射线衍射仪(XRD)、差示扫描量热仪(DSC)与电子万能材料试验机分别对ATP改性效果、熔融结晶行为及复合材料的重要力学性能进行表征测试. 试验结束后，利用表面轮廓仪与激光共聚焦显微镜观察复合材料表面形貌并分析其磨损机理. 结果表明：硅烷偶联剂KH570对ATP的改性效果良好，填充改性ATP能提高材料的邵氏硬度，且材料的拉伸性能随填充含量的提高呈下降趋势；对比纯UHMWP材料，复合材料的摩擦系数更低，适量的ATP填充能改善材料磨损性能，减小体积磨损率；试验中改性ATP质量分数为1%的复合材料其摩擦学性能最优，在低速重载时的摩擦系数及体积磨损率与纯UHMWPE相比分别降低了52.45%和37.58%.

Ultra-high molecular weight polyethylene (UHMWPE) bearing materials frequently experience severe wear under low-speed and heavy-load working conditions. Adding modified fillers can significantly enhance their tribological performance. Attapulgite (ATP), as a modified filler, can strengthen the mechanical properties of the matrix material and thereby improve its friction characteristics. However, the reinforcing effect of ATP as a filler is often diminished by the agglomeration effect. Surface modification treatment of ATP can overcome this agglomeration effect and achieve uniform blending between ATP and the matrix. Composite materials were prepared by blending UHMWPE with ATP modified using silane coupling agent KH570 via the surface chemical coating modification method, and a control experiment was conducted using pure UHMWPE material. The RTEC friction tester was employed to investigate the variation of the friction coefficient of the composite under water lubrication conditions with changes in load and rotational speed, as well as the impact of filler content on the wear performance of the composite under low-speed and heavy-load conditions (v=0.55 m/s, Fz=55 N). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and electronic universal testing machine were respectively used to characterize and test the modification effect of ATP, the melting and crystallization behavior of the materials, and the key mechanical properties of the composite. After the completion of the experiments, surface profiler and laser confocal microscope were utilized to observe the surface morphology of the composite and analyze its wear mechanism. The results indicate that the modification effect of silane coupling agent KH570 on ATP is favorable. Filling with modified ATP can improve the Shore hardness of the material, and the tensile properties of the material show a downward trend with the increase of filler content. Compared with pure UHMWPE, the composite material exhibits a lower friction coefficient. Appropriate ATP filling can improve the wear performance of the material and reduce the volume wear rate. Among the tested samples, the composite with 1% mass fraction of modified ATP has the optimal tribological performance. Under low-speed and heavy-load conditions, its friction coefficient and volume wear rate are reduced by 52.45% and 37.58% respectively compared with pure UHMWPE.

搜集汇总

背景与挑战

背景概述

该数据集研究了ATP改性UHMWPE复合材料在水润滑条件下的摩擦学特性，通过表面化学包覆改性法制备了硅烷偶联剂KH570处理的ATP与UHMWPE共混材料，并分析了其摩擦系数、磨损性能及力学行为。结果表明，改性ATP能显著降低材料的摩擦系数和体积磨损率，其中质量分数1%的复合材料在低速重载工况下性能最优，摩擦系数和磨损率相比纯UHMWPE分别降低52.45%和37.58%。