Ultrasonic-assisted MoS₂/GO/TiO₂ ceramic coatings: Enhancing anti-friction performance through dual-interface...

Area of Science:

• Materials Science
• Tribology
• Nanotechnology

Background:

• Two-dimensional (2D) materials like MoS2 enhance ceramic coatings for light alloy wear protection.
• Molybdenum disulfide (MoS2)/titanium dioxide (TiO2) coatings face challenges with brittle fracture due to incoherent interfaces.
• Optimizing interface design is crucial for improving nanomechanical properties.

Purpose of the Study:

• To improve the nanomechanical properties and anti-friction performance of MoS2/TiO2 ceramic coatings.
• To investigate the effect of modified interlayer spacing in MoS2 on interface behavior.
• To develop a facile technique for fabricating self-lubricating ceramic coatings on light alloys.

Main Methods:

• Utilized ultrasonic-assisted plasma electrolytic oxidation (PEO) to disperse graphene oxide (GO).
• Facilitated in-situ synthesis of MoS2 with modified interlayer spacing within TiO2 coatings.
• Analyzed dislocation evolution and interfacial bonding at MoS2/TiO2 interfaces with different MoS2 interlayer spacings (0.534 nm and 0.227 nm).

Main Results:

• Dual interface formation with distinct dislocation behaviors observed: dislocation dipoles releasing shear stress and inhibiting cracks at the 0.534 nm interface, and dislocation pinning enhancing deformation resistance at the 0.227 nm interface.
• Achieved a 90.0% reduction in friction coefficients for the MoS2/GO/TiO2 coating compared to traditional ceramic coatings.
• Demonstrated stable interfacial bonding through dislocation annihilation at the 0.534 nm interface.

Conclusions:

• The optimized dual interface structure effectively enhances nanomechanical properties and significantly reduces friction.
• Ultrasonic-assisted PEO provides a viable strategy for fabricating advanced self-lubricating ceramic coatings.
• The findings offer valuable insights into applying ultrasound for 2D material synthesis in coatings.