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Hardness and Nitrogen Bonding Structure of Al x Ti1−x N/CrN Multilayer Hard Coating

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Abstract:

Al x Ti1−x N/CrN multilayer coatings were fabricated by magnetron sputtering and those hardness variations were studied by observing the crack propagation and measuring the chemical bonding state of nitrides by Ti addition. While AlN/CrN multilayer shown stair-like crack propagation, Al x Ti1−x N/CrN multilayer illustrated straight crack propagation. Most interestingly, Ti addition induced more broken nitrogen bonds in the nitride multilayers, leading to the reduction of hardness. However, the hardness of Al0.25Ti0.75N/CrN multilayer, having high Ti contents, increased by the formation of many Ti–N bond again instead of Al–N bond. From these results, we found that linear crack propagation behavior was dominated by broken nitrogen bonds in the Al x Ti1−x N/CrN multilayer coatings.

Keywords: ALN/CRN; ALTIN/CRN; BROKEN NITROGEN BOND; CRACK PROPAGATION; MULTILAYER HARD COATING

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.4700

Publication date: February 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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