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4750 |
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Thursday, May 12, 2016, Room 3E 9:40 AM Characterization & Testing Methods |
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The evaluation of mechanical properties of suspension plasma sprayed zirconia coatings having various microstructures |
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Pawel Sokolowski* / Wroclaw University of Science and Technology, Poland Alberto Mejias/ Université Lille 1 / Universidad de Carabobo, France Didier Chicot/ Université Lille 1, France Radek Musalek/ Institute of Plasma Physics, Czech Republic Per Nylen/ University West, Sweden Lech Pawlowski/ University of Limoges, France |
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The paper describes the investigations of mechanical properties of various zirconia coatings in the term of their microstructure and phase/chemical composition. The coatings were deposited using Suspension Plasma Spraying technology using three different powders: (i) 8 wt.% of Y2O3 stabilized zirconia, (ii) 14 wt.% of Y2O3 stabilized zirconia and (iii) 24 wt.% of CeO2 + 2.5 wt.% of Y2O3 stabilized zirconia. Moreover four different plasma torches were used during spray process: (i) SG-100 of Praxair; (ii) Triplex of Oerlikon Metco; (iii) Axial III of Mettech and (iv) hybrid Water-Stabilized Plasma torch of IPP Prague. The coatings having columnar microstructure as well as well-known two-zone microstructure were obtained in the spray experiment. The analysis of mechanical properties was performed by the means of the instrumented indentation technique using a multi-cyclic loading to obtain the in-depth variation of the mechanical properties. Following coatings parameters were characterized: hardness (H), Youngs modulus (E) and fracture toughness (Kc). The measurements were made on the surface as well as on the cross-section of coatings. The essence knowledge was to determine and understand the influence of the coating morphology on their mechanical properties. |