Tribological behavior of self-lubricating carbon nanoparticle reinforced metal matrix composites
Tribological behavior of self-lubricating carbon nanoparticle reinforced metal matrix composites
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DOI：
10.1016/j.wear.2018.05.003
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发表时间：
2018-08
期刊：
影响因子：
5
通讯作者：
L. Reinert;I. Green;S. Gimmler;B. Lechthaler;F. Mücklich;S. Suárez
中科院分区：
文献类型：
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作者：
L. Reinert;I. Green;S. Gimmler;B. Lechthaler;F. Mücklich;S. Suárez
本研究的重点是调查的主要摩擦和磨损机制的情况下，干滑动的碳纳米颗粒增强镍基复合材料在弹性和弹塑性接触条件下。为此目的，选择多壁碳纳米管（CNT）、洋葱状碳（OLC）和纳米金刚石（nD）来代表各种各样的碳纳米颗粒，因为它们可以关于它们的碳杂化状态（sp2 vs. sp3）以及它们的形态和大小（“0 D”对“1D”）。基于Greenwood-Williamson模型进行接触模拟，以计算所需的接触载荷。摩擦和磨损分析由互补的表征技术支持，包括扫描电子显微镜、透射电子显微镜、能量色散光谱、拉曼光谱、光学显微镜以及激光扫描显微镜。据发现，只有CNT提供有效的润滑作为增强相在复合材料中，提出不同的润滑机制的测试接触条件。CNT的高纵横比被认为是润滑机制所必需的，允许颗粒被拖入直接摩擦接触。润滑效果随着碳纳米管体积含量的增加而增加，与未增强的镍参考相比，达到最大稳态摩擦减少50%。
The present study focuses on investigating the dominant friction and wear mechanisms in case of dry sliding of carbon nanoparticle reinforced nickel matrix composites under elastic and elasto-plastic contact conditions. For this purpose, multi-wall carbon nanotubes (CNT), onion-like carbon (OLC) and nanodiamonds (nD) were chosen to represent a large variety of carbon nanoparticles as they can be systematically distinguished regarding their carbon hybridization state (sp2vs. sp3) as well as their morphology and size (“0D” vs. “1D”). Contact simulations based on the Greenwood-Williamson model are conducted in order to calculate the required contact loads. Friction and wear analysis is supported by complementary characterization techniques, including scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, light microscopy as well as laser scanning microscopy. It is found, that only CNT provide efficient lubrication as reinforcement phase in composites, presenting different lubrication mechanisms for the tested contact conditions. The high aspect ratio of CNT is found to be essential for the lubrication mechanisms, allowing the particles to be dragged into the direct tribological contact. The lubrication effect increases with increasing volume content of CNT, reaching a maximum steady state frictional reduction of 50% compared to the unreinforced nickel reference.