Tailoring H/E ratio of Ti-TiN nano-composite coatings with improved toughness for tribological applications

Kataria, S and Praveen, Kumar and Jakeer, Khan and Barshilia, Harish C (2011) Tailoring H/E ratio of Ti-TiN nano-composite coatings with improved toughness for tribological applications. In: The International Symposium on Surface Protective Coatings and Indo-German Conference on Surface Engineering, December 7, 2011, Hotel Sheraton, Bangalore . (Unpublished)

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Abstract

Nanocomposite Ti-TiN coatings were deposited on Si (100) substrates using pulsed DC magnetron sputtering as a function of Ti metal content. Structural and microstructural characterizations of the as-deposited coatings were carried out using X-ray diffraction and field emission scanning microscopy. Nano-mechanical properties of the coatings were evaluated using nanoindentation, scratch and wear testing techniques. It was observed that nano-hardness and elastic modulus of the coatings decreased with an increase in Ti content. The H/E ratio, an indicator of wear resistance, was found to vary from 0.074 to 0.101 for the coatings with low Ti content. A linear increase in fracture toughness from 1.19 to 2.75 MPam1/2 with increasing Ti content was observed. However, the coating with highest fracture toughness value did not reveal good wear resistance. The coating with a Ti content of 63.3% was found to be optimised for wear resistant applications with a fracture toughness of 2.12 MPam1/2 and nano-hardness of around 17.5 GPa.

Item Type: Conference or Workshop Item (Lecture)
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 06 Jan 2012 10:41
Last Modified: 06 Jan 2012 10:41
URI: http://nal-ir.nal.res.in/id/eprint/10179

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