Adaptive NbN/Ag coatings for high temperature tribological applications

Stone, D. S.; Migas, Jeremiah; Martini, Ashlie; Smith, Timothy M.; Muratore, Christopher; Voevodin, Andrey A.; Aouadi, Samir

doi:10.1016/j.surfcoat.2012.04.054

Cited by 102 publications

(46 citation statements)

References 32 publications

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“…Also its strength increased with an increase in Ag content, which was due to the surface enhanced Raman scattering effect of Ag. When the Ag molecule was adsorbed on the surface of the films, the Raman signal intensity was higher than the expected value by simple calculation [22]. With an increase in Ag content, the Raman signal enhancement rate of NbN was improved, and the intensity of the NbN peak increased with the increase of Ag content.…”

Section: Composition and Phase Structure For Nbcn-ag Filmsmentioning

confidence: 80%

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

Coatings

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Abstract:In this study, reactive magnetron sputtering was applied for preparing NbCN-Ag films with different Ag additions. Ag contents in the as-deposited NbCN-Ag films were achieved by adjusting Ag target power. The composition, microstructure, mechanical properties, and tribological properties were characterized using energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HRTEM), Raman spectrometry, nano-indentation, and high-temperature sliding wear tests. Results indicated that face-centered cubic (fcc) NbN, hexagonal close-packed (hcp) NbN and fcc Ag, amorphous C and amorphous CN x phase co-existed in the as-deposited NbCN-Ag films. After doping with 2.0 at.% Ag, the hardness and elastic modulus reached a maximum value of 33 GPa and 340 GPa, respectively. Tribological properties were enhanced by adding Ag in NbCN-Ag films at room temperature. When the test temperature rose from 300 to 500 • C, the addition of Ag was found beneficial for the friction properties, showing a lowest friction coefficient of~0.35 for NbCN-12.9 at.% Ag films at 500 • C. This was mainly attributed to the existence of AgO x , NbO x , and AgNbO x lubrication phases that acted as solid lubricants to modify the wear mechanism.

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Section: Composition and Phase Structure For Nbcn-ag Filmsmentioning

confidence: 80%

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

Coatings

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“…In recent years, the NbN-Ag chameleon films were reported to extend the working temperature to 1000 • C [15]. Stone et al [15] reported that NbN-Ag films displayed the average friction coefficients in the 0.15-0.30 range against a Si 3 N 4 counterpart when the testing temperatures were above 700 • C because oxygen silver and the transition metal reacted to form lubricious binary metal oxide phase (silver niobate) at higher testing temperatures. Similar results were reported in the VN-Ag films [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and tribological properties of NbN-Ag composite films by reactive magnetron sputtering

2015

Applied Surface Science

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“…Values of coefficient of friction and wear rate of deposited TaN(Ag-Cu) coatings without and with heat-treatment are consigned in Table 4; the results of all tribological tests for the heat treated samples indicated a better anti-wear effect with increasing Ag-Cu content than the untreated ones. This improvement is linked to a surface enrichment of TaN with silver and copper nanoparticles, which have a solid lubricant effect that is more efficient than in untreated samples, as also explained by various authors [14,15], [34][35][36]. Figure 9 shows the wear tracks of C1 and C3 coatings, which after heat treatment are clearly smoother and shallower than as in the as produced condition (no heat treatment), decreasing removed material volume after tribological evaluation.…”

Section: Microhardness and Wear Evaluationmentioning

confidence: 64%

Mechanical and tribological features of TaN(Ag-Cu) duplex nanocomposite coatings: their response to heat treatment

Echavarría

Meza

2017

Ingeniare. Rev. chil. ing.

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AISI 420 martensitic stainless steel samples and silicon (100) were coated with tantalum nitride doped with copper and silver nanoparticles TaN(Ag-Cu) to improve their hardness and wear resistance. The coatings were deposited by unbalanced DC Magnetron Sputtering technique, using a tantalum target and other silver/copper composite target (50/50%at), confronted each other. The coated samples were subjected to an appropriate heat treatment at 250 ºC for 8 minutes to achieve a controlled diffusion of Ag-Cu nanoparticles to the TaN(Ag-Cu) surface. Due to their mechanical and tribological properties depend, not only on the content of Ag-Cu, but also on the size, shape and density of nanoparticles of Ag-Cu on the surface of the coating. The influence of the Ag-Cu content on the microstructure and mechanical and tribological properties of the composite coating were evaluated before and after the heat treatment was evaluated. In general terms, the microhardness and wear rate increased initially with Ag-Cu content, but then dropped down for contents higher to 0.71% at, exhibiting the lubricating effect of Ag-Cu nanoparticles in the compound before and after heat treatment. The heat treated C3 sample showed a microhardness of 15 GPa, very superior to the hardness of AISI 420 stainless steel, as well as a wear rate six orders of magnitude lower than the steel.Keywords: AISI 420, magnetron sputtering, silver and cooper nanoparticles, tantalum nitride, tribological properties. (100) coated samples. These parameters were studied in this as well. RESUMEN Se recubrieron muestras de acero inoxidable martensítico AISI 420 y de silicio EXPERIMENTAL METHODS TaN(Ag-Cu) coatings developmentTaN(Ag-Cu) coatings were deposited on AISI 420 steel plates (12.5x12.5x2.8 mm 3 ) and single crystalline silicon wafers (100) by unbalanced DC magnetron sputtering, using a tantalum target and an Ag/Cu (50-50%at) composited target, both with 99.9% purity and dimensions of 500x100x6 mm 3 . A rectangular vacuum chamber with dimensions of 500x500x800 mm 3 was used in this work.Silicon substrates were used for spectroscopic and X-ray diffraction measurements to reduce the signal from the alloying elements of steel. AISI 420 stainless steel samples were polished using SiC emery paper with grain sizes between 300 to 1200 and subsequently polished to a mirror finish until obtaining an average roughness of Ra= 0.05mm in alumina aqueous solution. The polished samples were cleaned in an ultrasonic bath with an alcoholacetone solution for 15 minutes and then subjected to argon ionic cleaning into the vaccum chamber during 30 minutes at a pressure of 1.7x10 -1 mbar and using a bias voltage of -500V applied to substrates.The nitriding process was performed into pulsed plasma conformed by Ar = 57 sccm, N 2 = 15 sccm and H 2 =27 sccm; the pressure, bias voltage and temperature of the process were fixed to 5.1x 10 -1 mbar, -600 V and 380 ºC, respectively. This process was performed for 7 hours. The low temperature of plasma nitriding was used to avoid the...

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Adaptive NbN/Ag coatings for high temperature tribological applications

Cited by 102 publications

References 32 publications

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Microstructure and tribological properties of NbN-Ag composite films by reactive magnetron sputtering

Mechanical and tribological features of TaN(Ag-Cu) duplex nanocomposite coatings: their response to heat treatment

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