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5377 |
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Wednesday, June 07, 2017, Hall 12 12:10 PM Aviation & Power Generation Industry I |
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On spraying of YSZ from liquid feedstocks with hybrid-water stabilized plasma torch |
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Radek Musalek* / Institute of Plasma Physics of the Czech Academy of Sciences, Czech Republic Jan Medricky / IPP CAS, v.v.i., Czech Republic Jiri Kotlan/ IPP CAS, v.v.i., Czech Republic Tomas Tesar/ IPP CAS, v.v.i., Czech Republic Frantisek Lukac/ IPP CAS, v.v.i., Czech Republic Tomas Chraska/ IPP CAS, v.v.i., Czech Republic |
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In the field of thermal spraying, Yttria-Stabilized Zirconia (YSZ) is one of the most commonly sprayed materials having numerous applications, in particular in thermal barriers or solid oxide fuel cells. Recent development in suspension/solution plasma spraying allowed deposition of novel types of YSZ coatings with very fine microstructures. However, economical spraying of liquid feedstocks demands a high plasma enthalpy in order to achieve considerable feed rate and deposition efficiency. Plasma generated by the hybrid water stabilized plasma (WSP-H) torch provides such a high-enthalpy plasma source. Aim of this study is to compare YSZ coatings deposited from suspensions or solutions provided by different manufacturers. Microstructure and deposition efficiency were evaluated, as well as basic thermo-mechanical properties of the deposited coatings, such as hardness and wear resistance, adhesion/cohesion strength or thermal conductivity. Results show that even subtle differences in the liquid feedstock characteristics, as well as deliberate choice of combination of the feedstock liquid and deposition conditions may result in remarkable differences in the coating microstructure and thus provide coatings with tailored properties. |