Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces
Dry friction and wear of self-lubricating carbon-nanotube-containing surfaces
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DOI：
10.1016/j.wear.2018.03.021
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发表时间：
2018-07-15
期刊：
影响因子：
5
通讯作者：
Suarez, Sebastian
中科院分区：
文献类型：
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作者：
Reinert, Leander;Varenberg, Michael;Suarez, Sebastian
某些摩擦学系统的不利环境条件，例如在高温或真空下运行，需要用固体润滑剂代替液体润滑剂。多壁碳纳米管（MWCNTs）是一种非常有效的固体润滑剂。这些颗粒已被用于制造自润滑材料，作为复合材料中的增强相，或作为固体润滑剂涂层，与纹理表面结合使用，防止颗粒从接触处脱落。然而，这两种方法都有一定的局限性。在复合材料的情况下，固体润滑剂的浓度是有限的，以免影响最终组件的机械稳定性。对于涂层表面结构，织构表面在实验过程中会发生退化。本研究的重点是将这些方法结合起来，以创建以MWCNTs作为固体润滑剂的增强自润滑表面。采用自制的环块摩擦计，研究了激光织构mwcnt涂层和mwcnt增强镍基复合材料在保角接触条件下单向滑动的行为。结果表明，与参考相比，这两种方法的结合可以使摩擦减少4倍，磨损率减少115倍。此外，对MWCNTs的润滑机理进行了更详细的研究，并提出了机械应力下MWCNTs的结构退化模型。我们的结果强调了集成解决方案是一种适合于单向滑动的自润滑表面的方法。
The unfavorable environmental conditions of certain tribological systems, such as operation at high temperatures or under vacuum, set the need to replace liquid with solid lubricants. Multi-Wall-Carbon Nanotubes (MWCNTs) have been emphasized as a very effective solid lubricant. The particles have been used to create selflubricating materials by acting as reinforcement phase in composites or as solid-lubricant coating that works in conjunction with textured surfaces to prevent the removal of particles from the contact. However, both approaches are restricted to some extent. In the case of composites, the solid lubricant concentration is limited so as not to influence the mechanical stability of the final component. For coated surface structures, the textured surfaces can degrade during the experiment. The present study focuses on the combination of these approaches in order to create enhanced self-lubricating surfaces with MWCNTs as the solid lubricant. A custom-made ring-on-block tribometer is used to study the behavior of laser textured MWCNT-coated and MWCNT-reinforced nickel matrix composites under the conditions of unidirectional sliding in conformal contact. It is shown that the combination of both approaches allows for a maximum 4-fold reduction in friction and a 115-fold reduction in wear rate compared to the reference. Additionally, the lubrication mechanism of the MWCNTs is investigated in more detail and a structural degradation model of the mechanically stressed MWCNTs is proposed. Our results highlight the integrated solution as a suitable approach for self-lubricating surfaces subjected to unidirectional sliding.