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Influence of Deposition Temperature on the Electrical and Electrochemical Properties of carbon-Based Coatings for Metallic Bipolar Plates, Prepared by Cathodic Arc Evaporation

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Advances in Materials Physics and Chemistry 2022年第4期12卷 47-57页

作者： Maximilian Steinhorst Maurizio Giorgio Teja Roch Christoph Leyens Fraunhofer Institute for Material and Beam Technology IWS Dresden Germany Institute of Material Science Technische Universit&auml t Dresden Dresden Germany

Cathodic arc evaporation is a well-established physical vapor deposition technique which is characterized by a high degree of ionization and high deposition rate. So far, this technique has been mainly used for the deposition of tribological coatings. In this study, anti-corrosive and electrical conductive carbon-based coatings with a metallic interlayer were prepared on stainless steel substrates as surface modification for metallic bipolar plates. Hereby, the influence of the deposition temperature during the deposition of the carbon top layer was investigated. Raman spectroscopy revealed differences in the microstructure at 200°C compared to 300°C and 100°C. Measurements of the interfacial contact resistance showed that the deposited coatings significantly improve the electrical conductivity. There are only minor differences between the different carbon top layers. The corrosion resistance of the coatings was studied via potentiodynamic polarization at room temperature and 80°C. Experiments showed that the coating with a carbon top layer deposited at 200°C, considerably reduces the current density and thus corrosion of the substrate is suppressed.

关键词： Bipolar Plate Corrosion Interfacial Contact Resistance carbon thin film Physical Vapor Deposition

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Chemical Composition and Mechanical Characteristic of Nitrogen Ion Beam Mixed carbon Nanolayer

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Journal of Chemistry and Chemical Engineering 2014年第5期8卷 488-492页

作者： Frantisek Cemy Petr Vlcak Janez Kovac Josef Sepitka Martin Klima Libor Dvorak Department of Physics Faculty of Mechanical Engineering Czech Technical University in Prague Prague 16607 CzechRepublic Department of Surface Engineering and Optoelectronics Jozef Stefan Institute Ljubljana 1001 Slovenia

Ion beam methods for modification of nanohardness of surface nanolayers of the titanium alloy Ti6AI4V were applied. After deposition of carbon nanolayers by electron beam evaporation, the ion implantation of nitrogen into samples was carried out. The chemical composition of the modified surface area was investigated by AES （auger electron spectroscopy）. The nanohardness of resulted ion beam modified surface nanolayers were investigated by nanoindentation testing. The measured concentration profiles indicate the atomic mixing of carbon into the substrate. It was found that the modified samples had a markedly higher nanohardness than the unmodified samples. The increased nanohardness is attributed to the newly created phases in the surface area.

关键词： Nanocomposite carbon thin film electron beam evaporation ion implantation.

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