Abstract
Electrochemical, mechanical and tribological properties of Ti-C-N and Ti-Nb-C-N coatings deposited onto Si (100) and AISI 4140 steel substrates were determined in this work. Introduction of Nb in the ternary Ti C-N film was evaluated via quantitative elemental concentration depth profile by glow discharge optical emission spectroscopy (GDOES) and the morphology via scanning electron microscopy (SEM) were observed for the layers before the tests. The morphological surface was analyzed via AFM. Mechanical and tribological properties for both coatings were obtained by mean of nanoindentation measurements throughload versus displacement method, and scratch test using the critical load criterion, respectively. The failure modes from scratch test were observed via optical microscopy. Nanoindentation results reaching the elastic-plastic behavior of the TiCN and Ti-Nb-C-N coatings with inclusion of Nb (TiNbCN), indicated not only the hardness and elastic modulus but also the critical load for the adhesive failure increase when increasing r.f negative bias voltage. An improvement of hardness and critical load around 60% and 28% for TiCN as well as 26% and 31% for TiNbCN, respectively, was associated to an increasing in the r.f negative bias voltage from 0 V to -100 V.
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Julio C. Caicedo, Ph.D., is an Assistant Professor in the Department of Materials Engineering at the Universidad del Valle in Cali, Colombia. His research interests include but are not limited to functional material systems, material protection, the study of synthesis of new materials and biomaterials. He is the recipient of a Universitat de Barcelona postdoctoral fellowship, and has been awarded more than 10 recognition awards including the Mayor’s General Gold Medal of Cali-Colombia. He has published more than 100 papers in peerreviewed journals.
Hugo Caicedo, Ph.D., is a scholar, executive and innovator in the Bioengineering and Biotechnology sectors at the University of Illinois at Chicago. His interdisciplinary research interests range from material science and engineering to molecular biology, regenerative medicine and pharmaceutical research. He is primarily interested in micro-scale technology and biophysical techniques to control the microenvironment of cells or tissue to understand brain function in both normal and disease states. He is the recipient of MIT, Bogazicy University and Universite Pierre and Marie Cuire pre-doctoral fellowships and Harvard-MIT post-doctoral fellowship. He has been awarded more than 20 recognition awards including three National Science Foundation Fellowships in the US and the Mayor’s General Gold Medal of Cali-Colombia. Currently he serves as the Director of Research and Outreach at the National Biotechnology and Pharmaceutical Association in the US.
William Aperador, Ph.D., is a Professor in the Department of Mechatronic Engineering at the Universidad Militar Nueva Granda, in Bogota, Colombia; where he currently serves as the Vice Dean of Engineering. He has also served as the Director of graduate studies. His research interests include but are not limited to electrochemical material systems, material protection, the study of corrosion-erosion of new materials and biomaterials. He has published more than 100 papers in peerreviewed journals.
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Caicedo, J.C., Aperador, W. & Caicedo, H.H. Physical and tribological diagnostic of Ti-(Carbon Nitrides) and Ti-Nb-(Carbon Nitrides) coatings. J Mech Sci Technol 28, 489–497 (2014). https://doi.org/10.1007/s12206-013-1117-4
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DOI: https://doi.org/10.1007/s12206-013-1117-4