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7432 |
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Friday, May 06, 2022, Hall G2 2:00 PM Characterization & Testing Methods II |
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Microstructure and properties of coatings sprayed from experimental (Al,Cr)2Ti7O15 solid solution powders by APS |
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Maximilian Grimm* / Chemnitz University of Technology, Germany Susan Conze / Fraunhofer IKTS, Germany Lutz-Michael Berger/ Fraunhofer IKTS, Germany Sven Thiele/ Fraunhofer IKTS, Germany Rico Drehmann/ Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany Thomas Lampke/ Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany |
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The development of new coating compositions is a laborious task. By this reason in this study the potential of new oxide compositions in the ternary system Al2O3-Cr2O3-TiO2 was explored by sintered ceramic bodies prepared by field assisted sintering (FAST). Based on these results two feedstock powder compositions with (Al,Cr)2Ti7O15 as the main phase were prepared by agglomeration and sintering from fine Al2O3, Cr2O3 and TiO2 powders. These experimental powders were investigated in terms of their morphology, elemental and phase composition by SEM, EDS and XRD and were sprayed by APS. The coatings and the bulk ceramics were comparatively studied regarding their microstructure and properties. In addition to porosity and hardness, the sliding wear resistance, the corrosion resistance against 1N H2SO4 solution and the electrical properties were investigated. The XRD results indicate that the (Al,Cr)2Ti7O15 solid solution in the powders decomposes during spraying into different other solid solution structures depending on the Al/Cr ratio. As a result, the properties of the APS coatings differ significantly from that of the bulk ceramics. |