Investigation of coating properties in the Al2O3 - TiO2 system obtained by thermal spraying with feedstock powders and water-based suspensions

Tuesday, May 28, 2019: 14:30
Annex Hall/F202 (Pacifico Yokohama)
Mrs. Monika Michalak , Fraunhofer Institute for Materials and Beam Technology, IWS, Dresden, Germany
Dr. Filofteia-Laura Toma , Fraunhofer Institute for Materials and Beam Technology, IWS, Dresden, Germany
Dr. Maria Barbosa , Fraunhofer Institute for Materials and Beam Technology, IWS, Dresden, Germany
Dr. Pawel Sokolowski , Wrocław University of Technology, Wrocław, Poland
Dr. Leszek Latka , Wrocław University of Technology, Wrocław, Poland
ÿþIn this work, different coating compositions in the system Al2O3-TiO2 (Al2O3-3 wt% TiO2, Al2O3-13 wt% TiO2 and Al2O3-40 wt% TiO2) produced by different thermal spraying methods: Atmospheric Plasma Spraying (APS), Suspension Atmospheric Plasma Spraying (S-APS) and Suspension-High Velocity Oxygen Fuel Spraying (S-HVOF), were investigated. The motivation behind the use of S-APS and S-HVOF laid in the difficulties with using conventional APS for production of finely-grained coatings. The aim of this study was investigation of the influence of spray feedstock (micro-sized powders and water-based suspensions of fine dispersed particles) properties and spray processes on the coating properties. The coatings were investigated in terms of their microstructure and selected mechanical properties (Vickers microhardness, adhesion pull-of test). The sliding wear resistance was investigated by the conventional ball-on-disc (BoD) in accordance to ASTM G99 " 17 standard. The spray process has a major influence on the morphology and coating properties. Correlations between Vickers microhardness, Young's modulus as well as fracture toughness (KC) and the coating morphology were function of feedstock and spray processes were proposed. Keywords: plasma spraying, APS, S-APS, S-HVOF, coating microstructure, adhesion, microhardness, Young's modulus, fracture toughness, sliding wear resistance
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