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The Effects of Nitrogen Bonding on Hardness of AIN/CrN Multilayer Hard Coatings

Yoon, Sang-Won and Seo, Jong-Hyun and Chae, Keun-Hwa and Park, Jong-Keuk and Song, Jong-Han and Jayaram, Vickram and Lee, Kon-Bae and Seong, Tae-Yeon and Hoon-Kwon, * and Ahn, Jae-Pyoung (2012) The Effects of Nitrogen Bonding on Hardness of AIN/CrN Multilayer Hard Coatings. In: International Conference on Electronic Materials (IUMRS-ICEM), AUG 22-27, 2010, Seoul, SOUTH KOREA, pp. 1476-1479.

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AIN/CrN multilayer hard coatings with various bilayer thicknesses were fabricated by a reactive sputtering process. The microstructural and mechanical characterizations of multilayer coatings were investigated through transmission electron microscope (TEM) observations and the hardness measurements by nano indentation. In particular, the variation of chemical bonding states of the bilayer nitrides was elucidated by near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Many broken nitrogen bonds were formed by decreasing the bilayer thickness of AIN/CrN multilayer coatings. Existence of optimum AIN/CrN multilayer coatings thickness for maximum hardness could be explained by the competition of softening by the formation of broken nitrogen bonds and strengthening induced by decreasing bilayer thickness.

Item Type: Conference Paper
Additional Information: Copyright of this article is belongs to American Scientific Publishers.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 21 Jul 2012 09:25
Last Modified: 23 Jul 2012 10:22
URI: http://eprints.iisc.ac.in/id/eprint/44615

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