Characterization of Mo&lt;sub&gt;2&lt;/sub&gt;N/Ag Nanocomposite Coatings Produced by Magnetron Sputtering

Turutoğlu, Tuncay; Ürgen, Mustafa; Çakır, Ali; Öztürk, A.

doi:10.4028/www.scientific.net/kem.264-268.489

Cited by 23 publications

(5 citation statements)

References 11 publications

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“…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: 97%

“…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%

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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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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

et al. 2007

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“…According to the Hall-Petch relationship, the reduction in grain size increases the hardness of materials [29,30]. For silver-rich films, the presence of the soft component facilitates the grain boundary sliding, leading to the drop of hardness [15,19]. The influence of a substrate bias voltage on hardness and Ag content of MoN-Ag coatings is presented in Figure 11.…”

Section: Microhardnessmentioning

confidence: 99%

“…Up to now, several papers have been published on the topic of MoN-Ag films deposited by magnetron sputtering from elemental target materials [3,[15][16][17][18] or mosaic targets [19,20]. The optimal concentration of Ag significantly improves the mechanical and tribological properties of parts subjected to tribological load [3].…”

Section: Introductionmentioning

confidence: 99%

“…The optimal concentration of Ag significantly improves the mechanical and tribological properties of parts subjected to tribological load [3]. A slight hardness increase is observed for Ag additions of a few percent using reactive magnetron sputtering [15,19]. However, at higher Ag contents (>15 at.%) hardness of MoN-Ag films drops below 10 GPa [15].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS

et al. 2021

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The coating system MoN-Ag is an interesting candidate for industrial applications as a low friction coating at elevated temperatures, due to the formation of lubricous molybdenum oxides and silver molybdates. Film deposition was performed by high-power impulse magnetron sputtering and direct current magnetron sputtering. To facilitate a future transfer to industry Mo-Ag composite targets have been sputtered in Ar/N2 atmosphere. The chemical composition of the deposited MoN-Ag films has been investigated by wavelength dispersive X-ray spectroscopy. Morphology and crystallographic phases of the films were studied by scanning electron microscopy and X-ray diffraction. To obtain film hardness in relation to Ag content and bias voltage, the instrumented indentation test was applied. Pin-on-disc tribological tests have been performed at room temperature and at high temperature (HT, 450 °C). Samples from HT tests have been analyzed by Raman measurements to identify possible molybdenum oxide and/or silver molybdate phases. At low Ag contents (≤7 at.%), coatings with a hardness of 18–31 GPa could be deposited. Friction coefficients at HT decreased with increasing Ag content. After these tests, Raman measurements revealed the MoO3 phase on all samples and the Ag2Mo4O13 phase for the highest Ag contents (~23–26 at.%).

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XPS investigations of tribolayers formed on TiN and (Ti,Re)N coatings

Oktay

Kahraman

Ürgen

et al. 2015

Applied Surface Science

108

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Characterization of Mo<sub>2</sub>N/Ag Nanocomposite Coatings Produced by Magnetron Sputtering

Cited by 23 publications

References 11 publications

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

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

Formation of Solid Lubricants during High Temperature Tribology of Silver-Doped Molybdenum Nitride Coatings Deposited by dcMS and HIPIMS

XPS investigations of tribolayers formed on TiN and (Ti,Re)N coatings

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