Molybdenum disulfide as a lubricant and catalyst in adaptive nanocomposite coatings

• Published in: Surface & coatings technology Vol. 201; no. 7; pp. 4125 - 4130
• Main Authors: Muratore, C., Voevodin, A.A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 20.12.2006; Elsevier
• Subjects: Adaptive coating; Applied sciences; Exact sciences and technology; High temperature; Metals. Metallurgy; Molybdenum disulfide; Production techniques; Surface treatment; Tribology; Molybdenum disulfide; High temperature; Adaptive coating; Tribology; Plasma; Temperature; Composite coating; Nanocomposite; Composite material; Surface treatment; Lubricant
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2006.08.014

Nanocomposite YSZ–Ag–Mo–MoS 2 coatings with different MoS 2 additions (0–100 at.%) were deposited with a hybrid pulsed laser/magnetron sputtering/filtered cathodic arc process. Wear testing was performed from 25 to 700 °C for each of the coatings. Electron microscopy and other characterization techniques were used to examine the surfaces and wear tracks of the coatings and to determine the mechanisms resulting in the measured tribological properties. Adaptive coatings containing 8 at.% MoS 2 demonstrated a friction coefficient of 0.2 throughout the temperature range examined here, compared to 0.4 for YSZ–Ag–Mo with no MoS 2. Characterization of the YSZ–Ag–Mo–8% MoS 2 coating revealed that MoS 2 and silver provided lubrication at temperatures ≤ 300 °C, while silver molybdate phases and MoO 3 were effective lubricants at higher temperatures. Silver molybdate was not observed in the coatings containing 0% MoS 2. The role of sulfur in the formation of silver molybdate is briefly discussed.