Synthesis and characterisation of self-lubricating tungsten nitride thin films as protective machine tool coatings

Ghantasala, Sri Bharani; Sharma, Sumitra

doi:10.1080/00202967.2023.2271712

Cited by 1 publication

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, W 2 N films deposited using radio frequency reactive magnetron sputtering were stable at temperatures <800 °C with a hardness of 21.73 GPa . Ghantasala and Sharma reported that cubic tungsten nitride films exhibited self-lubrication properties, hardness of 28.36 ± 2.57 GPa, and low coefficient of friction of 0.303. At elevated temperatures (>150 °C), WN x coatings form lubricating WO 3 , decreasing COF .…”

Section: Introductionmentioning

confidence: 99%

Composite Materials with Nanoscale Multilayer Architecture Based on Cathodic-Arc Evaporated WN/NbN Coatings

Smyrnova,

Sahul,

Haršáni

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Hard nitride coatings are commonly employed to protect components subjected to friction, whereby such coatings should possess excellent tribomechanical properties in order to endure high stresses and temperatures. In this study, WN/NbN coatings are synthesized by using the cathodic-arc evaporation (CA-PVD) technique at various negative bias voltages in the 50–200 V range. The phase composition, microstructural features, and tribomechanical properties of the multilayers are comprehensively studied. Fabricated coatings have a complex structure of three nanocrystalline phases: β-W2N, δ-NbN, and ε-NbN. They demonstrate a tendency for (111)-oriented grains to overgrow (200)-oriented grains with increasing coating thickness. All of the data show that a decrease in the fraction of ε-NbN phase and formation of the (111)-textured grains positively impact mechanical properties and wear behavior. Investigation of the room-temperature tribological properties reveals that with an increase in bias voltage from −50 to −200 V, the wear mechanisms change as follows: oxidative → fatigue and oxidative → adhesive and oxidative. Furthermore, WN/NbN coatings demonstrate a high hardness of 33.6–36.6 GPa and a low specific wear rate of (1.9–4.1) × 10–6 mm3/Nm. These results indicate that synthesized multilayers hold promise for tribological applications as wear-resistant coatings.

show abstract

Section: Introductionmentioning

confidence: 99%