Barshilia, Harish C and Deepthi, B and Srinivas, G and Rajam, KS (2012) Sputter deposited low-friction and tough Cr-Si3N4 nanocomposite coatings on plasma nitrided M2 steel. Vacuum, 86 (8). pp. 1118-1125. ISSN 0042-207X
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Abstract
Nanocomposite coatings of Cr-Si3N4 exhibiting low friction and high toughness were prepared on plasma nitrided AISI M2 steel substrates using an unbalanced magnetron sputtering system. The surface morphology and cross-sectional microstructure of the Cr-Si3N4 nanocomposite coatings were studied using field emission scanning electron microscopy (FESEM) techniques. Cr-Si3N4 nanocomposite coatings prepared at 48 at.% Cr exhibited a dense microstructure with nanoindentation hardness and toughness values of 19 GPa and 2.0 MPam½, respectively. Nanoscratch measurements indicated that Cr-Si3N4 nanocomposite coatings exhibited good adhesion with a maximum critical load of 150 mN. Ball-on-disc reciprocating tests at a load of 2 N showed that Cr-Si3N4 nanocomposite coatings prepared at 48 at.% Cr exhibited an average friction coefficient of 0.30. FESEM studies of the wear tracks indicated that there was no significant wear loss and the Cr-Si3N4 nanocomposite coatings exhibited only mild wear due to oxidation.
Item Type: | Article |
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Uncontrolled Keywords: | M2 steel;Cr–Si3N4 nanocomposite coating;Plasma nitriding; Magnetron sputtering; Toughness;Friction coefficient |
Subjects: | CHEMISTRY AND MATERIALS > Composite Materials |
Depositing User: | Dr. Harish C. Barshilia |
Date Deposited: | 14 Feb 2012 04:43 |
Last Modified: | 28 Mar 2012 03:41 |
URI: | http://nal-ir.nal.res.in/id/eprint/10031 |
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