Structure and Mechanical Properties of Multilayered Nanostructured TiN/ZrN Ion-plasma Coatings

Multilayered coatings based on TiN/ZrN with different thickness of bilayers were deposited on steel substrates using vacuum arc deposition of a cathodes (C-PVD method). Thickness of bilayer strongly depended on deposition conditions and varied in the range 39 – 305 nm, total thickness of the coatings were 11-19 μm. Mechanical and tribotechnical characteristics of the coatings were investigated in the paper as well as its microstructure. Influence of the bilayer thickness on the properties of the coatings were explored

Properties of Multilayered Nanoscale TiN/MoN Coatings, Fabricated Using Arc Evaporation

Using vacuum-arc evaporation method we fabricated periodic multilayered TiN/MoN coatings with different bilayer periods ranging from 8 to 100 nm. We found that MoN and TiN layers grown on steel substrate show local partial epitaxy and columnar growth across interfaces. A Mo-Ti-C interlayer was observed between the substrate and the multilayered coating. MoN and TiN layers contain small (5÷30 nm) grains and are well crystallized with (100) preferred orientation. They were identified as stoichiometric fcc TiN and cubic γ-Mo2N. Non-cubic molybdenum nitride phases were also detected. The hardness of the obtained structures achieved great values and maximal hardness was 31÷41.8 GPa for multilayered structure with 8 nm period. Fabricated coatings are perspective for using as protective coatings in order to improve mechanical characteristics of different construction materials

Influence of the Bilayer Thickness of Nanostructured Multilayer MoN/CrN Coating on Its Microstructure, Hardness, and Elemental Composition

Multilayer nanostructured coatings consisting of alternating MoN and CrN layers were obtained by vacuum cathode evaporation under various conditions of deposition. The transition from micron sizes of bilayers to the nanometer scale in the coatings under investigation leads to an increase in hardness from 15 to 35.5 GPa (with a layer thickness of about 35 nm). At the same time, when the number of bilayers in the coat- ing decreases, the average Vickers hardness increases from 1267 HV0.05 to 3307 HV0.05. An increase in the value of the potential supplied to the substrate from –20 to –150 V leads to the formation of growth textures in coating layers with the [100] axis, and to an increase in the intensity of reflections with increasing bilayer thickness. Elemental analysis carried out with the help of Rutherford backscattering, secondary ion mass spectrometry and energy dispersion spectra showed a good separation of the MoN and CrN layers near the surface of the coatings

Structural Features and Tribological Properties of Multilayer Coatings Based on Refractory Metals

A comparative analysis of the structural features and tribological properties of multilayer coatings based on refractory metal compounds has been conducted in this review. Features of formation of the elec- tronic structure of the synthesized coatings have been discussed, and the effect of methods and conditions of deposition on changes in the physicomechanical characteristics of nanocrystalline structures based on tran- sition metal nitrides has been shown. Dependences of antifriction properties, corrosion resistance, and ther- mal stability on the modulation period (Λ) and the number of bilayers in the studied multilayer coatings have been determined. A decrease in the modulation period of individual layers in a coating positively affects the oxidation resistance of the coating, while an increase in the number of interfaces between the layers slows down the diffusion of oxygen atoms deep into the coating and, thereby, increases the protective properties of the multilayer system as a whole. The effect of the droplet component in cathodic-arc coatings on corrosion development mechanisms in corrosive media has been shown. A class of multifunctional multilayer coatings with an adaptive friction mechanism, which is characterized by a change in the properties and structure during tribological tests, has been discussed separately

Specific Features of the Microstructure and Properties of Multielement Nitride Coatings Based on TiZrNbAlYCr

Multicomponent nanostructured coatings based on (TiZrNbAlYCr)N with a hardness as high as 47 GPa were obtained by cathodic arc deposition. The effect of partial nitrogen pressure PN (with constant bias potential Ub = –200 V applied to the substrate) on the phase-composition variation, the size of crystallites, and their relation to the microstructure and hardness was investigated. An increase in the nitrogen pressure resulted in the formation of two phases with characteristic BCC (the lattice period is 0.342 nm) and FCC lattices with averaged nanocrystallite sizes of 15 and 2 nm. At a high pressure of 0.5 Pa, crystallites in the FCC phase with a lattice period of 0.437 nm grew in size to ~7 nm. The hardness of deposited coatings with larger (3.5 nm) FCC-phase crystallites and smaller (7 nm) BCC-phase crystallites was enhanced considerabl

Наноструктурные покрытия (Ti-Zr-Nb)N, полученные методом вакуумно-дугового испа- рения: структура и свойства

У статті обговорюються результати осадження наноструктурних покриттів отриманих вакуумно-дуговим випаровуванням катоду (Ti-Zr-Nb), а також аналізується їх структура, морфологія, елементний склад та трибологічні властивості (тертя, знос, адгезія). Структурний аналіз показав формування ГЦК фази та в невеликій кількості ОЦК – фази (при тиску у камері Р = 4×10 – 3 Торр). Результати трибологічних випробувань показали, що коефіцієнт тертя змінюється від 0.61 до 0.491 та твердість за Віккерсом від 37 до 44.57 ГПа, при зміні (збільшенні) тиску у камері. Проведений аналіз елементів у доріжках тертя.В статье обсуждаются результаты осаждения наноструктурных покрытий,полученных вакуумно-дуговым испарением катода (Ti-Zr-Nb),а также анализируются их структура, морфология, элементный состав и трибологические свойства (трение, износ, адгезия). Структурный анализ показал формирование ГЦК фазы и в небольшом количестве ОЦК-фазы (при давлении в камере Р = 4×10 – 3 Торр). Результаты трибологических испытаний показали, что коэффицент трения изменяется от 0.61 до 0.491 и твердость по Виккерсу от 37 до 44.57 ГПа, при изменении (увеличении) давления в камере. Проведен анализ элементов в дорожках трения.In the article discusses the results of the deposition of nanostructured coatings obtained by vacuum arc deposition of cathode (Ti-Zr-Nb), and analyzes their structure, morphology, elemental composition, and tribological properties (friction, wear and adhesion). The structural analysis showed the formation of an FCC phase and BCC phase in a small amount (at a chamber pressure Р 410 – 3 Тоrr). The results of tribological tests showed that the friction coefficient varies from 0.61 to 0.491, and Vickers hardness from 37 to 44.57 GPa when changing (increasing) the pressure in the chamber. The analysis of the elements in the tracks of friction was studied

Наноструктурные покрытия (Ti-Zr-Nb)N, полученные методом вакуумно-дугового испа- рения: структура и свойства

У статті обговорюються результати осадження наноструктурних покриттів отриманих вакуумно-дуговим випаровуванням катоду (Ti-Zr-Nb), а також аналізується їх структура, морфологія, елементний склад та трибологічні властивості (тертя, знос, адгезія). Структурний аналіз показав формування ГЦК фази та в невеликій кількості ОЦК – фази (при тиску у камері Р = 4×10 – 3 Торр). Результати трибологічних випробувань показали, що коефіцієнт тертя змінюється від 0.61 до 0.491 та твердість за Віккерсом від 37 до 44.57 ГПа, при зміні (збільшенні) тиску у камері. Проведений аналіз елементів у доріжках тертя.В статье обсуждаются результаты осаждения наноструктурных покрытий,полученных вакуумно-дуговым испарением катода (Ti-Zr-Nb),а также анализируются их структура, морфология, элементный состав и трибологические свойства (трение, износ, адгезия). Структурный анализ показал формирование ГЦК фазы и в небольшом количестве ОЦК-фазы (при давлении в камере Р = 4×10 – 3 Торр). Результаты трибологических испытаний показали, что коэффицент трения изменяется от 0.61 до 0.491 и твердость по Виккерсу от 37 до 44.57 ГПа, при изменении (увеличении) давления в камере. Проведен анализ элементов в дорожках трения.In the article discusses the results of the deposition of nanostructured coatings obtained by vacuum arc deposition of cathode (Ti-Zr-Nb), and analyzes their structure, morphology, elemental composition, and tribological properties (friction, wear and adhesion). The structural analysis showed the formation of an FCC phase and BCC phase in a small amount (at a chamber pressure Р 410 – 3 Тоrr). The results of tribological tests showed that the friction coefficient varies from 0.61 to 0.491, and Vickers hardness from 37 to 44.57 GPa when changing (increasing) the pressure in the chamber. The analysis of the elements in the tracks of friction was studied