Preparation of mullite/NbN composites through spark plasma sintering

Nasab, Sana Abdollahi; Manafi, Sahebali; Ghahremani, Davoud

doi:10.1016/j.matchemphys.2022.126126

Cited by 9 publications

(2 citation statements)

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“…This phenomenon is associated with the increase in density with higher substrate temperatures [ 22 ]. These results also indicate complete solubility between TiN and NbN, which is consistent with findings from other studies in the literature [ 22 , 25 , 28 ].…”

Section: Resultssupporting

confidence: 92%

“…Although reports on the tribological properties of TiNbN coatings under severe wear conditions are scarce, basic tribological properties have been explored under low load, low speed, and short distance conditions, showing a coefficient of friction of approximately 0.1 and wear rate of approximately 10 −4 mm 3 /Nm. Abrasion and the formation of hard particles are the main reported wear mechanisms [ 25 , 28 ]. Thus, there is a significant information gap in the information available, and studies are necessary to determine the adhesion, mechanical, and tribological properties of TiNbN coatings under severe wear conditions simulating cutting tool environments, for example.…”

Section: Introductionmentioning

confidence: 99%

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TiNbN Hard Coating Deposited at Varied Substrate Temperature by Cathodic Arc: Tribological Performance under Simulated Cutting Conditions

et al. 2023

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This study focused on investigating the adhesion and tribological properties of niobium-doped titanium nitride (TiNbN) coatings deposited on D2 steel substrates at various substrate temperatures (Ts) under simulated cutting conditions. X-ray diffraction confirmed the presence of coatings with an FCC crystalline structure, where Nb substitutes Ti atoms in the TiN lattice. With increasing Ts, the lattice parameter decreased, and the crystallite material transitioned from flat-like to spherical shapes. Nanoindentation tests revealed an increase in hardness (H) with Ts, while a decrease in the elastic modulus (E) resulted in an improved elastic strain limit for failure (H/E) and plastic deformation resistance (H3/E2), thereby enhancing stiffness and contact elasticity. Adhesion analysis showed critical loads of ~50 N at Ts of 200 and 400 °C, and ~38 N at Ts of 600 °C. Cohesive failures were associated with lateral cracking, while adhesive failures were attributed to chipping spallation. The tribological behavior was evaluated using a pin-on-disk test, which indicated an increase in friction coefficients with Ts, although they remained lower than those of the substrate. Friction and wear were influenced by the surface morphology, facilitating the formation of abrasive particles. However, the absence of coating detachment in the wear tracks suggested that the films were capable of withstanding the load and wear.

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