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Investigating Carbon Coating on Ni-Invar and Ti-6Al-4V Surfaces for Low Friction Performance.

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This study used cassava leaves for sustainable carbon coatings on Ni-Invar and Ti-6Al-4V. Ni-Invar achieved superlubricity with graphene coatings, while Ti-6Al-4V showed higher friction due to carbide formation.

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Tribology

Background:

  • Developing sustainable and high-performance coatings is crucial for advanced materials.
  • Pack carburization offers a potential route for surface modification.
  • Understanding substrate-coating interactions is key to tailoring tribological properties.

Purpose of the Study:

  • To explore a sustainable pack carburization method using cassava leaves for carbon coatings.
  • To investigate the structural and tribological characteristics of coatings on Ni-Invar and Ti-6Al-4V substrates.
  • To elucidate the growth mechanisms and substrate influence on coating formation and performance.

Main Methods:

  • Sustainable pack carburization using Manihot esculenta (cassava) leaves.
  • Surface characterization via X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscopy (SEM), and lateral force microscopy (LFM).
  • Computational modeling including Monte Carlo simulations and Density Functional Theory (DFT) calculations.

Main Results:

  • Ni-Invar substrates developed turbostratic multilayer graphene coatings with ultralow coefficients of friction (COF) down to 0.0033.
  • Ti-6Al-4V substrates formed titanium carbide and carbonate-rich coatings with significantly higher COF values.
  • DFT calculations revealed preferential metal-metal bonding on Ni-Invar and strong Ti-graphene affinity on Ti-6Al-4V, influencing growth mechanisms.

Conclusions:

  • Substrate chemistry critically dictates carbon coating morphology and tribological behavior.
  • Cassava leaf-derived carbon coatings show potential for superlubricity on Ni-Invar.
  • The study provides insights into sustainable surface engineering for friction reduction.