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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Updated: Mar 7, 2026

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Long-lasting solid lubrication by CNT-coated patterned surfaces.

L Reinert1, F Lasserre1, C Gachot1

  • 1Department of Material Science and Engineering, Chair of Functional Materials, Saarland University, 66123 Saarbrücken, Germany.

Scientific Reports
|February 18, 2017
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Combining laser surface texturing with multiwall carbon nanotubes (MWCNT) solid lubricant significantly enhances component longevity. This integrated approach extends lubrication effectiveness by at least fivefold, reducing wear and preserving surface textures.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Tribology

Background:

  • Lubricants and surface textures reduce friction and wear but have limitations.
  • Surface textures can degrade, and lubricants can be displaced from contact areas.
  • Existing methods for reducing friction and wear are often insufficient for long-term performance.

Purpose of the Study:

  • To investigate the synergistic effects of combining laser surface texturing with multiwall carbon nanotubes (MWCNT) as a solid lubricant.
  • To overcome the individual limitations of surface texturing and solid lubrication.
  • To develop an integral solution for enhanced tribological performance.

Main Methods:

  • Laser surface texturing was applied to create specific surface topographies.
  • Multiwall carbon nanotubes (MWCNT) were deposited onto textured surfaces using electrophoretic deposition.
  • Frictional behavior was measured using a tribometer, and wear tracks were analyzed via scanning electron microscopy and Raman spectroscopy.

Main Results:

  • The combined approach demonstrated a minimum fivefold increase in lubrication longevity.
  • Degradation of laser surface textures was significantly reduced.
  • Raman spectroscopy indicated slower MWCNT degradation and reduced oxide formation within the tribological contact.

Conclusions:

  • The integration of laser surface texturing and MWCNT solid lubrication offers a superior solution for reducing friction and wear.
  • This combined method enhances component durability and preserves surface integrity.
  • A novel model for lubricant entrapment within surface textures was proposed and validated.