Influence of processing parameters on the surface quality of electrophoretically deposited alumina coatings on foam ceramics |
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| Affiliation: | 1. School of Metallurgy, Northeastern University, Shenyang 110819, PR China;2. State key laboratory of rolling and automation, Northeastern University, Shenyang 110819, PR China;1. Division of Nonmetallic-Inorganic Materials, Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany;2. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria;1. Institute for Single Crystals NAS of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine;2. SSI “Institute for Single Crystals”, NAS of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine;1. IRCER, UMR CNRS 7315, University of Limoges, 12 rue Atlantis, F-87068 Limoges, France;2. Galtenco Solutions Company, Parc Scientifique Unitec 1, F-33600 Pessac, France;3. ICMCB, UMR CNRS 5026, Bordeaux INP, 87 Avenue du Docteur Schweitzer, F-33608 Pessac, France;1. Laboratory of Thin Film Techniques and Optical Test, Xi''an Technological University, Xi’an 710032, Shaanxi, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi''an 710049, China;3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, China;4. Physics Department, Faculty of Science, Tanta University, Al-Geish st., Tanta 31527, Egypt |
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| Abstract: | Previous work showed that the electrophoretic deposition of coatings with aligned pore channels is technically feasible on Al2O3-C foams. In the next step, the amount and size of cracks in the sintered coatings should be reduced. The study revealed the drying conditions, alumina raw materials used, the chemistry of the foam skeleton and the sintering conditions as significant influences. The best drying procedure was freeze drying after sudden freezing in liquid nitrogen. Three alumina raw materials with different particle size distributions were tested with regard to linear shrinkage, number of cracks and number of channel-like pores. The CT 9 and CL 370 showed a low number of cracks, however CT 9 possessed almost no pores. The Al2O3-C foam skeletons electrophoretically coated with CL 370 and sintered at 1600 °C in air showed the best results with a low number of small cracks and high number of channel-like pores. |
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| Keywords: | Electrophoretic deposition Open ceramic foam Alumina |
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