Influence of Surface Design on the Solid Lubricity of Carbon Nanotubes-Coated Steel Surfaces
Influence of Surface Design on the Solid Lubricity of Carbon Nanotubes-Coated Steel Surfaces
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DOI：
10.1007/s11249-018-1044-8
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发表时间：
2018-09-01
影响因子：
3.2
通讯作者：
Suarez, S.
中科院分区：
文献类型：
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作者：
Schaefer, C.;Reinert, L.;Suarez, S.
地形设计的表面能够储存固体润滑剂，防止它们脱离摩擦接触，从而显著延长表面的润滑寿命。本研究提供了一个系统的评估的影响，表面结构设计的多壁碳纳米管（MWCNT）涂层钢表面的固体润滑效果。为此，使用飞秒脉冲激光系统的直接激光写入被部署以创建表面结构，其随后通过电泳沉积涂覆有MWCNT。结构的结构深度或纵横比以及因此固体润滑剂的润滑剂储存体积是变化的。使用球盘摩擦计记录表面的摩擦行为，并通过互补表征技术对表面进行彻底表征。所有MWCNT涂层表面均可实现高效润滑。然而，与预期的相反，它表明，更深的结构与更大的润滑剂储存量不会导致延长润滑寿命，并表现得几乎等同于涂层的非结构化表面。这尤其可归因于结构的最终表面粗糙度和结构的斜率陡度的差异，这阻止了润滑剂有效地供应到接触件中。
Topographically designed surfaces are able to store solid lubricants, preventing their removal out of the tribological contact and thus significantly prolonging the lubrication lifetime of a surface. The present study provides a systematic evaluation of the influence of surface structure design on the solid lubrication effect of multi-walled carbon nanotubes (MWCNT) coated steel surfaces. For this purpose, direct laser writing using a femtosecond pulsed laser system is deployed to create surface structures, which are subsequently coated with MWCNT by electrophoretic deposition. The structural depth or aspect ratio of the structures and thus the lubricant storage volume of the solid lubricant is varied. The frictional behavior of the surfaces is recorded using a ball-on-disk tribometer and the surfaces are thoroughly characterized by complementary characterization techniques. Efficient lubrication is achieved for all MWCNT-coated surfaces. However, and in contrast to what would be expected, it is shown that deeper structures with larger lubricant storage volume do not lead to an extended lubrication lifetime and behave almost equally to the coated unstructured surfaces. This can be attributed, among other things, to differences in the final surface roughness of the structures and the slope steepness of the structures, which prevent efficient lubricant supply into the contact.