The present research studied the tribological properties of Al 2 O 3 nanofluids applied on steel-brass contacts. It was found that the coefficient of friction could be stabilized and reduced by approximately 40.7% after adding Al 2 O 3 nanoparticles. The wear width and wear depth could be reduced by up to 39.6% and 69.3% while using 1 wt% Al 2 O 3 nanofluid. By examining the worn surfaces, Al 2 O 3 nanoparticles were embedded into brass by external load to form a hard case, which could protect the brass surfaces from wear loss. In addition, some black spots with low shear resistance containing high carbon content were formed which were the result of the presence of oleic acid. In summary, the excellent lubricating performance of Al 2 O 3 nanofluids was mainly associated with the physical embedment of Al 2 O 3 nanoparticles and tribo-films of oleic acid. The results o...

中文翻译：

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钢-黄铜摩擦副上油基Al 2 O 3纳米流体的摩擦学性能和润滑机理的实验分析

本研究研究了应用于钢-黄铜接触的Al 2 O 3纳米流体的摩擦学性能。发现添加Al 2 O 3纳米颗粒后，摩擦系数可以稳定并且降低约40.7％。使用1 wt％的Al 2 O 3纳米流体时，磨损宽度和磨损深度可以分别降低39.6％和69.3％。通过检查磨损的表面，Al 2 O 3纳米颗粒在外部载荷作用下被嵌入黄铜中以形成坚硬的外壳，这可以保护黄铜表面免受磨损损失。另外，由于油酸的存在，形成了一些含高碳含量的低抗剪切强度黑点。综上所述，Al 2 O 3纳米流体的优异润滑性能主要与Al 2 O 3纳米颗粒的物理包埋和油酸摩擦膜有关。结果还是...