Phase composition and mechanical properties of homostructure NbN nanocomposite coatings deposited by modulated pulsed power magnetron sputtering

Li, Y.G.; Yuan, Hao; Jiang, Z.T.; Pan, N.; Lei, M.K.

doi:10.1016/j.surfcoat.2020.125387

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…The NbN layer exhibited a nanocomposite structure, as was observed in Ref. [ 30 ]. A nanocomposite is a multiphase material in which one of the phases has one, two, or three dimensions of less than 100 nm [ 58 ].…”

Section: Resultssupporting

confidence: 56%

“…The deposition parameters favored the formation of the W 2 N phase with (200) texture, ε-NbN with (100), and δ-NbN with (200) preferred orientations. Li et al [ 30 ] studied NbN coatings with the same nanocomposite structure, demonstrating enhanced toughness and hardness. According to the XRD pattern of WN/NbN, lattice parameters of the W 2 N and ε-NbN phases were increased to 4.22 Å and a = 3.005 Å, c = 11.3 Å, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, this coating system is expected to have enhanced resistance to cracking and superior wear behavior. The described findings may be explained by the effect of the nanocomposite nature of the NbN layers consisting of two nanocrystalline phases (hexagonal and cubic) [ 30 , 66 ]. The δ’-NbN phase has a higher covalency level compared to the cubic one.…”

Section: Resultsmentioning

confidence: 99%

“…The Cauchy pressure for δ-NbN and δ’-NbN phases was positive, meaning that they should be tough and ductile. However, the cubic structure with a higher number of dislocation sliding systems demonstrated superior to hexagonal NbN ductility [ 30 ]. Thus, a nanocomposite structure consisting of these two phases within the NbN layers and the multilayer architecture of WN/NbN coatings endows them with improved elasticity and cracking resistance.…”

Section: Resultsmentioning

confidence: 99%

“…Molybdenum nitride is expected to reduce the wear and coefficient of friction (COF) of the multilayer system by forming the lubricant Magnéli phase [ 4 , 27 , 28 ]. The introduction of NbN should optimize the performance of WN due to its superior hardness and wear resistance [ 29 , 30 ]. As far as the authors are aware, the combination of WN and MoN in one multilayer structure has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Mechanical and Tribological Properties of Advanced Layered WN/MeN (Me = Zr, Cr, Mo, Nb) Nanocomposite Coatings

et al. 2022

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Due to the increased demands for drilling and cutting tools working at extreme machining conditions, protective coatings are extensively utilized to prolong the tool life and eliminate the need for lubricants. The present work reports on the effect of a second MeN (Me = Zr, Cr, Mo, Nb) layer in WN-based nanocomposite multilayers on microstructure, phase composition, and mechanical and tribological properties. The WN/MoN multilayers have not been studied yet, and cathodic-arc physical vapor deposition (CA-PVD) has been used to fabricate studied coating systems for the first time. Moreover, first-principles calculations were performed to gain more insight into the properties of deposited multilayers. Two types of coating microstructure with different kinds of lattices were observed: (i) face-centered cubic (fcc) on fcc-W2N (WN/CrN and WN/ZrN) and (ii) a combination of hexagonal and fcc on fcc-W2N (WN/MoN and WN/NbN). Among the four studied systems, the WN/NbN had superior properties: the lowest specific wear rate (1.7 × 10−6 mm3/Nm) and high hardness (36 GPa) and plasticity index H/E (0.93). Low surface roughness, high elastic strain to failure, Nb2O5 and WO3 tribofilms forming during sliding, ductile behavior of NbN, and nanocomposite structure contributed to high tribological performance. The results indicated the suitability of WN/NbN as a protective coating operating in challenging conditions.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%