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1215 |
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Tuesday, June 03, 2008, Room 08 3:00 PM Plasma Spraying and Plasma Transferred Arc 3 New trends and modified plasma processes for the application of ceramic-based coatings |
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Microplasma spraying of ZrO2 coatings |
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Yuri Borisov* / E.O. Paton Electric Welding Institute, Ukraine Sergey Vojnarovitch/ Paton Welding Institute, Ukraine Alexandr Kislitsa/ Paton Welding Institute, Ukraine Alla Borisova/ Paton Welding Institute, Ukraine Miroslav Karpets/ Paton Welding Institute, Ukraine Alla Tunik/ Paton Welding Institute, Ukraine |
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Experiments for estimation of influence of microplasma spraying parameters in ZrO2 ? coating properties were performed with using of fractional-factorial design of the experiments. Regression equations for determination of the parameters significance and a selection of conditions for a deposition of coatings with specified properties were obtained. Possibility of deposition of ZrO2 ? Y2O3 coating with tetragonal phase content 90 wt.% and more without cubic phase content by microplasma spraying was shown. Conditions of microplasma ZrO2 ? coating spraying with high content of tetragonal phase (93-95%) and porosity (1,3-1,8%) were established. Measurement of microplasma sprayed ZrO2 ? coating spots has established that the spots have an elliptical shape. Size of major and lateral axis (and also sprayed hill altitude) depends on spray parameters, mainly on amperage and spray distance. Microplasma sprayed of ZrO2 ? coatings can be applied for repair of small local defects on thermobarrier coatings and a deposition of zirconia electrolyte layer in solid oxide fuel cell. |