Molecular Dynamics Simulation and Experimental Study of Friction and Wear Characteristics of Carbon Nanotube-Reinforced Nitrile Butadiene Rubber

Lubricants Pub Date : 2024-07-22 DOI:10.3390/lubricants12070261

Ce Liang, Changgeng Shuai, Xin Wang

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Abstract

Nitrile butadiene rubber (NBR) and its various composite materials are widely employed as friction materials in mechanical equipment. The use of carbon nanotube (CNT) reinforcement in NBR for improved friction and wear characteristics has become a major research focus. However, the mechanisms underlying the improvement in the friction and wear characteristics of NBR with different CNT contents remain insufficiently elucidated. Therefore, we conducted a combined analysis of NBR reinforced with varying CNT contents through molecular dynamics (MD) simulations and ring–block friction experiments. The aim is to analyze the extent to which CNTs enhance the water-lubricated friction and dry wear properties of NBR and explore the improvement mechanisms through molecular chain characteristics. The results of this study demonstrate that as the mass fraction of CNTs (0%, 1.25%, 2.5%, 5%) increases, the water-lubricated friction coefficient of NBR continuously decreases. Under water-lubricated conditions, CNTs improve the water storage capacity of the NBR surface and enhance lubrication efficiency. In the dry wear state, CNTs help reduce scratch depth and dry wear volume.

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碳纳米管增强丁腈橡胶摩擦和磨损特性的分子动力学模拟与实验研究

丁腈橡胶（NBR）及其各种复合材料被广泛用作机械设备的摩擦材料。在丁腈橡胶中使用碳纳米管（CNT）增强材料以改善摩擦和磨损特性已成为研究的重点。然而，不同碳纳米管含量的丁腈橡胶改善摩擦和磨损特性的机理仍未得到充分阐明。因此，我们通过分子动力学（MD）模拟和环块摩擦实验对不同 CNT 含量的增强 NBR 进行了综合分析。目的是分析 CNT 在多大程度上增强了丁腈橡胶的水润滑摩擦和干磨损性能，并通过分子链特性探索其改善机制。研究结果表明，随着 CNT 质量分数（0%、1.25%、2.5%、5%）的增加，丁腈橡胶的水润滑摩擦系数不断降低。在水润滑条件下，CNT 提高了丁腈橡胶表面的储水能力，提高了润滑效率。在干磨损状态下，氯化萘有助于减少划痕深度和干磨损量。

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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Lubricants

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