Thin films of Mo2N/Ag nanocomposite—the structure, mechanical and tribological properties

Gulbiński, W.; Suszko, T.

doi:10.1016/j.surfcoat.2006.02.017

Cited by 122 publications

(48 citation statements)

References 29 publications

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“…They also have a good chemical resistance. Thus, they can be used in various applications such as hard coatings, corrosion and abrasion resistant layers to protect the tools (few microns thick), or as adaptive tribological coatings with low friction coefficient and wear [5][6][7][8] and for micromechanical applications [9]. They are also very interesting as gate electrodes and barriers of diffusion [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Nitride Films: Crystal Structures, Synthesis, Mechanical, Electrical and Some Other Properties

et al. 2015

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Among transition metal nitrides, molybdenum nitrides have been much less studied even though their mechanical properties as well as their electrical and catalytic properties make them very attractive for many applications. The δ-MoN phase of hexagonal structure is a potential candidate for an ultra-incompressible and hard material and can be compared with c-BN and diamond. The predicted superconducting temperature of the metastable MoN phase of NaCl-B1-type cubic structure is the highest of all refractory carbides and nitrides. The composition of molybdenum nitride films as well as the structures and properties depend on the parameters of the process used to deposit the films. They are also strongly correlated to the electronic structure and chemical bonding. An unusual mixture of metallic, covalent and ionic bonding is found in the stoichiometric compounds.

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Section: Introductionmentioning

confidence: 99%

Molybdenum Nitride Films: Crystal Structures, Synthesis, Mechanical, Electrical and Some Other Properties

et al. 2015

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“…The impetus for investigating this material stems from its superior mechanical properties (hardness reported to be in the [28][29][30][31][32][33][34] GPa range compared to [18][19][20][21][22][23][24] GPa for TiN and CrN) and the lubricating properties of its surface oxides (MO x ) at elevated temperatures ([300°C) which is due to the presence of lamellar structures (Magnéli phases) that shear easily during contact loading [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The benefit of using the latter group of materials is the improved fracture toughness and the selflubricating potential, provided by the soft metal, at high temperature (properties that are important for rolling element bearings, air foil bearings, gears, etc.) In the literature, alloying elements that were incorporated in the MO-N coatings include Cu [17,18], Ag [19,20], Si [21,22], and C [23]. The addition of the optimum amount of these alloying elements was found to provide enhanced mechanical (toughness) and tribological (reduced friction coefficient and wear rate) properties.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Mo2N/MoS2/Ag Tribological Nanocomposite Coatings for Aerospace Applications

et al. 2007

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Reactively sputtered Mo 2 N/MoS 2 /Ag nanocomposite coatings were deposited from three individual Mo, MoS 2 , and Ag targets in a nitrogen environment onto Si (111), 440C grade stainless steel, and inconel 600 substrates. The power to the Mo target was kept constant, while power to the MoS 2 and Ag targets was varied to obtain different coating compositions. The coatings consisted of Mo 2 N, with silver and/or sulfur additions of up to approximately 24 at%. Coating chemistry and crystal structure were evaluated using X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), which showed the presence of tetragonal Mo 2 N and cubic Ag phases. The MoS 2 phase was detected from XPS analysis and was likely present as an amorphous inclusion based on the absence of characteristic XRD peaks. The tribological properties of the coatings were investigated in dry sliding at room temperature against Si 3 N 4 , 440C stainless steel, and Al 2 O 3 . Tribological testing was also conducted at 350 and 600°C against Si 3 N 4 . The coatings and respective wear tracks were examined using scanning electron microscopy (SEM), optical microscopy, profilometry, energy dispersive X-ray spectroscopy (EDX), and microRaman spectroscopy. During room temperature tests, the coefficients of friction (CoF) were relatively high (0.5-1.0) for all coating compositions, and particularly high against Si 3 N 4 counterfaces. During high-temperature tests, the CoF of single-phase Mo 2 N coatings remained high, but much lower CoFs were observed for composite coatings with both Ag and S additions. CoF values were maintained as low as 0.1 over 10,000 cycles for samples with Ag content in excess of 16 at% and with sulfur content in the 5-14 at% range. The chemistry and phase analysis of coating contact surfaces showed temperature-adaptive behavior with the formation of metallic silver at 350°C and silver molybdate compounds at 600°C tests. These adaptive Mo 2 N/MoS 2 /Ag coatings exhibited wear rates that were two orders of magnitude lower compared to Mo 2 N and Mo 2 N/Ag coatings, hence providing a high potential for lubrication and wear prevention of hightemperature sliding contacts.

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“…The segregation of silver was also confirmed by Gulbi ski and Suszko [25], that studied this phenomenon in another metal nitride (MoN), indicating that higher amounts of silver segregation in grain boundaries prevent the growth of the MoN structure, gradually decreasing its crystallinity. In the same framework, a study conducted by…”

Section: Morphological and Structural Characterizationmentioning

confidence: 62%

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

Machado

Pedrosa

Fonseca

et al. 2013

JNanoR

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Thin films composed of titanium nitride doped with silver were deposited by DC reactive sputtering, with Ag contents varying between 0 and 50 at.%. The as-deposited samples were subjected to vacuum annealing treatments, with a range of temperatures varying from 200 to 500°C, in order to study the morphological and structural changes that may occur. The as-deposited samples showed three main zones of basic characteristics, which differ both in terms of the morphology and structural features.With the increase of the annealing temperature, the thermodynamic stability was accelerated, revealing a phenomenon of dispersion of silver particles at 200 °C and the start of its segregation at 300 °C. At 400 °C, the coalescence of the segregated Ag particles begins, while at 500 °C the formation of large clusters of Ag is glaring, particularly in the samples with higher Ag content. In addition, and corroborating the * To whom all correspondence should be sent (fvaz@fisica.uminho.pt) 2 presence of free Ag in the thin films, the increase of the annealing temperature promotes coating's crystallinity and some Ag grain growth.

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Thin films of Mo2N/Ag nanocomposite—the structure, mechanical and tribological properties

Cited by 122 publications

References 29 publications

Molybdenum Nitride Films: Crystal Structures, Synthesis, Mechanical, Electrical and Some Other Properties

Molybdenum Nitride Films: Crystal Structures, Synthesis, Mechanical, Electrical and Some Other Properties

Adaptive Mo2N/MoS2/Ag Tribological Nanocomposite Coatings for Aerospace Applications

Structural and Morphological Changes in Ag:TiN Nanocomposite Films Promoted by In-Vacuum Annealing

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