High performance nanostructured Cr-WS2 solid lubricant coatings prepared on mechanically textured substrates

Deepthi, B and Praveen, Kumar and Srinivas, G and Barshilia, Harish C (2013) High performance nanostructured Cr-WS2 solid lubricant coatings prepared on mechanically textured substrates. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Cr-WS2 nanocomposite solid lubricant coatings were prepared on mechanically textured stainless steel substrates. Micron-sized dimples of approximately 10-12 µm depth and 100×80 µm2 area with uniform dimple spacing of 300 µm were created on the substrates using a knurling tool. Substrate surface texturing improved the tribological properties of Cr-WS2 nanocomposite coatings significantly. Cr-WS2 nanocomposite coatings prepared on textured steel substrates exhibited a friction coefficient of 0.1 after 28,800 cycles compared to coatings prepared on non-textured substrates which exhibited a friction coefficient of 0.45. The dimpled regions acted as solid lubricant reservoirs and also helped in trapping wear debris. The retention of solid lubricant material in the dimpled region was confirmed using field emission scanning electron microscopy and energy dispersive X-ray spectroscopy studies.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Cr-WS2 nanocomposite coatings;Substrate surface texturing; Tribological properties;Solid lubricant reservoirs
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 16 Dec 2013 11:01
Last Modified: 18 Jun 2015 13:47
URI: http://nal-ir.nal.res.in/id/eprint/11858

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