Panwar, Omvir Singh and Tripathi, Ravi Kant and Chockalingam, Sreekumar (2015) Improved nanomechanical properties of hydrogenated tetrahedral amorphous carbon films measured with ultra low indentation load. MATERIALS EXPRESS , 5 (5). 410 -418.

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Abstract

This paper reports the nanomechanical properties of as grown and hydrogenated tetrahedral amorphous carbon (ta-C, ta-C: H) films deposited by S-bend filtered cathodic vacuum arc technique measured with 1.4 mN load. It has been found that the hydrogenation of ta-C film improved the nanomechanical properties. Maximum hardness (H) of 38.15 GPa (with improvement of similar to 80%) has been obtained for ta-C: H film deposited at a hydrogen partial pressure of 1.4 x 10(-1) Pa and maximum elastic modulus (E) value of 410.1 GPa has been obtained when the hydrogen partial pressure reduced to 7.4 x 10(-3) Pa. The plastic index parameter (HIE) of ta-C: H film (0.11) is found to be superior to that of ta-C film (0.073), which is a measure of wear resistance for coating applications. The improved HIE of ta-C: H films may be due to the passivation of surface defects and favorable formation of sp(3) hybridized bonds.

Item Type:	Article
Uncontrolled Keywords:	ta-C: H, Filtered Cathodic Vacuum Arc, Nanoindentation, Nanomechanical Properties
Subjects:	Materials Science Nanoscience/ Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	28 Sep 2016 05:33
Last Modified:	28 Sep 2016 05:33
URI:	http://npl.csircentral.net/id/eprint/1858

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