Magnéli phase formation of PVD Mo–N and W–N coatings

Gassner, Gert; Mayrhofer, P.H.; Kutschej, K.; Mitterer, Christian; Kathrein, M.

doi:10.1016/j.surfcoat.2006.07.067

Cited by 166 publications

(75 citation statements)

References 19 publications

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“…3,5 Another excellent example is Mo 2 N (with T c ¼ 5-7 K (Refs. 3, 5, and 6)), because its high-temperature modification, cubic-structured c-Mo 2 N (Fm-3m), exhibits excellent mechanical and tribological properties 7,8 and-as shown in our recent studies [9][10][11] -has enormous potentials for being used as wear-resistant coating. Interestingly, like most cubic-structured transition metal nitrides, c-Mo 2 N crystallizes with the NaCl-type structure, yet with 50% randomly distributed vacancies at the N-sublattice.…”

Section: Introductionmentioning

confidence: 98%

The impact of nitrogen content and vacancies on structure and mechanical properties of Mo–N thin films

Klimashin

Koutná

Euchner

et al. 2016

Journal of Applied Physics

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Based on a combined computational and experimental study, we show that besides the thermodynamically stable β-MoN0.5 and δ2-MoN phases, also metastable γ-MoNx and its ordered relative γ′-MoNx can be synthesized by physical vapor deposition. The formation of the NaCl-based γ-MoNx phase is favored for nitrogen concentrations between 23 and 34 at.% (i.e., x = 0.30–0.53). Higher nitrogen contents (close to the 3:2 stoichiometry, hence, MoN0.67) favor the ordering of the vacancies at the nitrogen sublattice (hence, γ′-MoNx). The highest hardness of ∼33 GPa is obtained for single-phase cubic-structured γ-MoN0.53 coatings, whereas the ordered γ′-MoN0.67 coatings are slightly softer with a hardness of ∼28 GPa.

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Section: Introductionmentioning

confidence: 98%

The impact of nitrogen content and vacancies on structure and mechanical properties of Mo–N thin films

Klimashin

Koutná

Euchner

et al. 2016

Journal of Applied Physics

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“…While nitrides of single elements are studied well enough, their multilayer modifications need study that is more detailed [26][27][28][29][30][31][32][33][34][35]. Therefore, the study of features of structure, elemental and phase composition of multilayer coatings depending on the deposition conditions is an important task in solid-state physics and materials science [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Arc-Evaporated Nanoscale Multilayer Nitride-Based Coatings for Protection Against Wear, Corrosion, and Oxidation

2016

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The studies of the structure and properties of nanoscale multilayer coatings based on the nitrides of refractory metals are summarized in a brief review. By the example of TiN/MoN, TiN/ZrN, CrN/MoN, and more complex (multilayer) (TiZrNbTaHf)N/WN:(TiZrNbTaHf)N/MoN obtained by vacuum-arc deposition of cathode, the dependences of their hardness, wear resistance, friction, corrosion, and oxidation on conditions of the deposition and layers' thickness are investigated and analysed. The regularities of the structure and behaviour properties of such nanoscale multilayer coatings depending on the size of nanograins, textures, and stresses arising in these coatings are described.У короткому огляді узагальнено результати досліджень структури та влас-тивостей наномасштабних багатошарових покриттів нітридів тяжкотоп-ких металів. На прикладі TiN/MoN-, TiN/ZrN-, CrN/MoN-та більш склад-них (багатошарових) (TiZrNbTaHf)N/WN:(TiZrNbTaHf)N/MoN-покриттів, одержаних методою вакуумно-дугового осадження катоду, досліджено та проаналізовано залежності їх твердости, зносостійкости, тертя, корозії й окиснення від умов осадження та товщини шарів. Відмічено закономірнос-ті структури та властивостей поведінки даних наномасштабних багатоша-рових покриттів від розміру нанозерен, текстури та напруг, що виникають у цих покриттях.В кратком обзоре обобщены результаты исследований структуры и свойств наномасштабных многослойных покрытий нитридов тугоплавких метал-лов. На примере TiN/MoN-, TiN/ZrN-, CrN/MoN-и более сложных (много-

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“…In addition, the depth of the wear tracks exceeds the thickness of the AlCrN coating (Figure 11), which indicates that the coating was totally worn out during the wear process. It has been reported that the tribo-oxidation of a WC substrate resulted in the formation of a lubricious Magnéli phase WO 3 [37], which resulted in the low friction coefficients seen in Figure 10. (a) (c) Figure 13.…”

Section: Tribological Properties Of the Coatingsmentioning

confidence: 98%

Influence of Power Pulse Parameters on the Microstructure and Properties of the AlCrN Coatings by a Modulated Pulsed Power Magnetron Sputtering

Zheng¹,

Zhou²,

Gui³

et al. 2017

Coatings

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Abstract:In this study, AlCrN coatings were deposited using modulated pulsed power magnetron sputtering (MPPMS) with different power pulse parameters by varying modulated pulsed power (MPP) charge voltages (350 to 550 V). The influence of power pulse parameters on the microstructure, mechanical properties and thermal stability of the coatings was investigated. The results indicated that all the AlCrN coatings exhibited a dense columnar microstructure. Higher charge voltage could facilitate a denser coating microstructure. As the charge voltage increased up to 450 V or higher, the microvoids along the column boundaries disappeared and the coatings became fully dense. The main phase in the AlCrN coatings was the c-(Al, Cr)N solid solution phase with NaCl-type phase structure. A diffraction peak of the h-AlN phase was detected at a 2θ of around 33 • , when the charge voltage was higher than 500 V. The hardness of the AlCrN coatings varied as a function of charge voltage. The maximum value of the hardness (30.8 GPa) was obtained at 450 V. All the coatings showed good thermal stability and maintained their structure and mechanical properties unchanged up to 800 • C during vacuum annealing. However, further increasing the annealing temperature to 1000 • C resulted in apparent change in the microstructure and decrease in the hardness. The charge voltages also showed a significant influence on the high-temperature tribological behavior of the coatings. The coating deposited at the charge voltage of 550 V exhibited excellent tribological properties with a low friction coefficient.

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Magnéli phase formation of PVD Mo–N and W–N coatings

Cited by 166 publications

References 19 publications

The impact of nitrogen content and vacancies on structure and mechanical properties of Mo–N thin films

The impact of nitrogen content and vacancies on structure and mechanical properties of Mo–N thin films

Arc-Evaporated Nanoscale Multilayer Nitride-Based Coatings for Protection Against Wear, Corrosion, and Oxidation

Influence of Power Pulse Parameters on the Microstructure and Properties of the AlCrN Coatings by a Modulated Pulsed Power Magnetron Sputtering

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