Tribological Mechanism of Ultra‐High Molecular Weight Polyethylene Reinforced by Nano‐Silica Under Water Lubrication Conditions

Polymer Composites Pub Date : 2025-07-31 DOI:10.1002/pc.70250

Binbin Li, Qiang Huang, Xincong Zhou, Jian Huang, Bao Liu, Xue‐Shen Liu

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Abstract

ABSTRACT Ultra‐high molecular weight polyethylene (UHMWPE) is widely used in water‐lubricated bearings due to its excellent self‐lubricating properties. However, its low wear resistance limits its broader application. UHMWPE filled with nano‐silica (nano‐SiO 2 ) has been proven effective in improving its tribological properties, but the underlying mechanisms remain unclear. Herein, the hydroxyl groups of nano‐SiO 2 were modified by the silane coupling agents 3‐methacryloxypropyltrimethoxysilane (SiO 2(570) ) and 3‐aminopropyltriethoxysilane (SiO 2(550) ), respectively. Then, they were filled into the UHMWPE. Frictional tests were conducted between the composites and ZCuSn 10 Zn 2 under water lubrication conditions. The results showed that the different interfacial interplay between nano‐SiO 2 and UHMWPE makes for distinct wear mechanisms. The SiO 2(550) ‐filled composite demonstrated a significant reduction in wear rate, attributable to its superior ability to restrict the movement of UHMWPE molecular chains. However, the friction coefficient increased for all composites due to the modified SiO 2 hindering the formation of a complete water film.

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纳米二氧化硅增强超高分子量聚乙烯在水润滑条件下的摩擦学机理

超高分子量聚乙烯（UHMWPE）由于其优异的自润滑性能而广泛应用于水润滑轴承。但其较低的耐磨性限制了其更广泛的应用。纳米二氧化硅（nano - sio2）填充的超高分子量聚乙烯（UHMWPE）已被证明能有效改善其摩擦学性能，但其潜在机制尚不清楚。本文采用硅烷偶联剂3‐甲基丙烯氧基丙基三甲氧基硅烷（sio2(570)）和3‐氨基丙基三乙氧基硅烷（sio2(550)）分别对纳米sio2的羟基进行了改性。然后，将它们填充到超高分子量聚乙烯中。在水润滑条件下，对复合材料与zcusn10zn2进行了摩擦试验。结果表明，纳米sio2与超高分子量聚乙烯之间不同的界面相互作用导致了不同的磨损机制。二氧化硅（550）填充的复合材料显示出磨损率的显著降低，这归因于其优越的限制超高分子量聚乙烯分子链运动的能力。然而，由于改性sio2阻碍了完整水膜的形成，所有复合材料的摩擦系数都增加了。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Polymer Composites

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