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2855 |
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Process parameters influence in TBC coatings deposited by plasma thermal spray in the adherence and wear at high temperature |
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Gustavo Bavaresco Sucharski / Universidade Federal do Paraná - UFPR, Brazil Lucas Aguiar / Universidade Federal do Paraná - UFPR, Brazil Émillyn Ferreira Trevisani / Universidade Federal do Paraná - UFPR, Brazil Andre R. Capra/ Universidade Federal do Paraná - UFPR, Brazil Ramón S. Cortés Paredes/ Universidade Federal do Paraná - UFPR, Brazil |
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Thermal barrier coatings (TBCs) are used in equipment components in order to increase the lifetime at high temperature (about 1700-1800 K). TBCs are constructed from two layers of coating, a top coating ceramic resistant to thermal shocks and a bond coating responsible for adherence of the ceramic coating and resistance to corrosion and oxidation at substrate elevated temperatures of the substrate. The goal is to study the influence of process parameters of plasma thermal spray (APS) for deposition of TBCs by the testing of wear resistance at high temperature and adhesion between the deposited layers. The materials involved were YSZ ceramic alloys, and to the bond coat was deposited the NiCoCrAl superalloy. Tests were performed of microhardness, adhesion by tensile test and wear at high temperature in order to evaluate the mechanicals proprieties and relate them to variations in process parameters. The samples were evaluated by their porosity, micro and macrostructure and chemical composition. Preliminary results show that the optimization of process parameters allow increase the adhesion and maintain a high level of porosity without compromising the wear resistance of TBC. |