NDLI: Adaptive Mo$_{2}$N/MoS$_{2}$/Ag Tribological Nanocomposite Coatings for Aerospace Applications

Content Provider	Springer Nature Link
Author	Aouadi, Samir M. Paudel, Yadab Luster, Brandon Stadler, Shane Kohli, Punit Muratore, Christopher Hager, Carl Voevodin, Andrey A.
Copyright Year	2007
Abstract	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 micro-Raman 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 high-temperature sliding contacts.
Starting Page	95
Ending Page	103
Page Count	9
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	29
Issue Number	2
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2007-12-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Self-lubricating friction Solid lubricants Raman Solid lubricated wear Coatings Friction-reducing Nanotechnology Physical Chemistry Theoretical and Applied Mechanics Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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