Tribological behaviour of Mo–W doped carbon-based coating at ambient condition

Abstract

Poor adhesion strength and low thermal stability often restrict the tribological applications of the state-of-the-art diamond-like-carbon coatings in automotive industry. A novel carbon-based coating doped with molybdenum and tungsten (Mo−W−C) is deposited

Wear Mechanism of Mo-W Doped Carbon-Based Coating during Boundary Lubricated Sliding

“…The ~2.2 µm thick coating architecture contained a HIPIMS treated interface [4], a thin Mo − W − N base layer followed by a dense and columnar Mo − W − C layer on the top [5]. Moreover this coating showed good adhesion (L c~8 0.8 N), high hardness (1677.5 HV) [5] and high thermal stability.…”

“…The ~2.2 µm thick coating architecture contained a HIPIMS treated interface [4], a thin Mo − W − N base layer followed by a dense and columnar Mo − W − C layer on the top [5]. Moreover this coating showed good adhesion (L c~8 0.8 N), high hardness (1677.5 HV) [5] and high thermal stability. A pin-on-disc tribometer (CSM) was used to study the friction Raman spectrometer (Horiba-Jobin-Yvon LabRam HR800) fitted with a green laser (λ = 532 nm) was used to collect the spectra from the as-deposited coating, adhered debris on the counterpart and within the wear track.…”

Composition and dynamics of high power impulse magnetron discharge at W-Mo-C target in argon atmosphere

“…Metal-doped diamond-like carbon (Me-DLC) coatings can possess high hardness, low coefficients of friction against materials such as steel, and are generally chemically inert [1,2,3]. These desirable tribological properties arise as the properties of the film can be manipulated to give either diamond-like or graphite-like properties by controlling the deposition process.…”

“…Additionally, the incorporation of nitrogen, hydrogen, silicon or metaldoping gives further possibilities of controlling the chemistry, and thus the tribochemistry of the films. Recent study of Mandal et al confirmed that a mixed Mo and W doping of DLC layer improves the tribological performance and thermal stability of the Mo-W-C coating [2]. The authors have used a mixed HIPIMS + unbalanced magnetron (UBM) sputtering technique, where one Mo-W-C target was operated with HIPIMS power supply and three graphite targets were used in DC mode.…”

Isothermal and dynamic oxidation behaviour of Mo–W doped carbon-based coating

“…Mo − W doped carbon-based coating (Mo−W−C) and its improved tribological properties at ambient condition were explained in detail elsewhere [11]. This paper investigates the oxidation behaviour of Mo−W−C coating at elevated temperature using dynamic and isothermal oxidation tests and compares the performance with a state-of-the-art DLC coating.…”