Fabrication of composite coatings using a combination of electrochemical methods and reaction bonding process |
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| Affiliation: | 1. Institute of Solid State Physics, University of Latvia, Latvia;2. Elgootech, Latvia;3. Institute of Inorganic Chemistry, Riga Technical University, Latvia;1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China;2. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, 29 Yudao Street, Nanjing 210016, China;1. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;3. Université de Lyon, MATEIS, UMR CNRS5510, Bat. B. Pascal, INSA-Lyon, F-69621 Villeurbanne cedex, France;4. Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;1. Institute of Chemistry, Far-Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia;2. Far Eastern Federal University, Vladivostok, Russia;3. M.V. Lomonosov Moscow State University, Moscow, Russia |
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| Abstract: | The major difficulty in fabricating ceramic coatings on metal substrates using the electrophoretic deposition process (EPD) is problems caused by the volume shrinkage during the sintering of the green form ceramic coatings produced by EPD. Numerous cracks normally form in the EPD coating during sintering. In this work, we have developed the reaction bonding process to fabricate crack-free and dense ceramic coatings, where the volume shrinkage is compensated by the volume expansion due to the oxidation of aluminium in the green form coatings during sintering in air. Both EPD and electroplating were used here to produce green form coatings which contain aluminium particles and, in some cases, an intermediate nickel layer. During the subsequent heat treatment, melting and oxidation of the metals in the green form coating promote densification during sintering. By these means, relatively dense composite coatings have been fabricated on metal substrates. |
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