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  11. Tribological Properties Of A Sliding Joint With An A-c:h:w Coating Under Lubrication Conditions With Pao8 Oil And The Addition Of 2% Mos2 Nanoparticles

Tribological Properties of a Sliding Joint with an a-C:H:W Coating under Lubrication Conditions with PAO8 Oil and the Addition of 2% MoS2 Nanoparticles

Krystian Hadło1, Janusz Lubas1, Wojciech Szczypinski-Sala2

  • 1Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Powstańców Warszawy 8 Av., 35-959 Rzeszow, Poland.

Materials (Basel, Switzerland)
|February 24, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Adding amorphous hydrogenated tungsten-doped diamond-like carbon (a-C:H:W) coatings to engine components improves durability. Lubrication with PAO8 oil and MoS2 nanoparticles enhanced friction resistance in some contacts but increased wear in others, offering seizure protection.

Area of Science:

  • Materials Science
  • Tribology
  • Mechanical Engineering

Background:

  • Friction joints in combustion engines require enhanced durability and reliability.
  • Amorphous hydrogenated diamond-like carbon (a-C:H:W) coatings are promising for improving wear resistance.
  • Understanding lubricant effects on coated surfaces is crucial for performance optimization.

Purpose of the Study:

  • To investigate the tribological properties of a sliding joint with an a-C:H:W coating.
  • To evaluate the influence of PAO8 oil with MoS2 nanoparticles as a lubricant.
  • To assess the impact of this lubrication on friction, wear, and seizure resistance.

Main Methods:

  • Production of a-C:H:W coatings using Physical Vapor Deposition (PVD).
  • Testing tribological joints made of AISI 4337 steel with SAE-48 bearing alloy (conformal) and valve shims (non-conformal).
Keywords:
DLCMoS2coatingengine oil

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  • Lubrication with SAE 5W40 engine oil and a mixture of PAO8 oil with 2 wt.% MoS2 nanoparticles.

    • Main Results:

    • In conformal contact, PAO8 + MoS2 increased friction resistance compared to SAE 5W40 on quenched and tempered surfaces.
    • In non-conformal contact, PAO8 + MoS2 decreased friction resistance and temperature.
    • a-C:H:W coatings led to higher SAE-48 alloy wear but significantly lower valve shim wear.
    • PAO8 + MoS2 lubrication protected non-conformal joints from seizing.

    Conclusions:

    • The a-C:H:W coating's tribological performance is highly dependent on contact type and lubricant.
    • PAO8 oil with MoS2 nanoparticles offers benefits in non-conformal contacts, reducing friction, temperature, and preventing seizure.
    • While increasing wear in some components (SAE-48 alloy), the coating significantly reduces wear in others (valve shims).
    friction
    surface layer
    wear