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| Abstract No.: |
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| Title: |
Thermally sprayed TiO2- Cr2O3 coatings with multifunctional properties
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| Authors: |
Lutz-Michael Berger* / Fraunhofer Institute for Material and Beam Technology, Germany
Carl Christoph Stahr/ Fraunhofer-Institute for Material and Beam Technology; IWS, Germany
Sven Thiele/ Fraunhofer-Institute for Ceramic Technologies and Systems, IKTS, Germany
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| Abstract: |
Thermally sprayed titanium suboxide (TiOx) coatings are widely used in industrial applications due to their good tribological properties and their electrical conductivity. These properties are mainly dependent to the content of oxygen in the Ti ? O lattice. Oxygen defects can lead to the formation of so called Magneli-phases. The range of applications is limited by the fact that TiOx tends to re-oxidize during most working conditions especially at elevated temperatures. Also the extreme conditions in the flame or torch of the thermal spray process lead to undefined phase-changes and defects. In the system TiO2 ? Cr2O3 Magneli-phases are formed as well and it is supposed that no or significantly less change of the properties during spraying and exploitation occur. This work shows the possibilities of the new coating materials. In order to investigate the properties of the coatings, powders with different content of TiO2 and Cr2O3 were used. A part of the powders was especially prepared and contain exactly defined phases only. The powders were sprayed by APS and HVOF and the coatings were investigated for their phase composition and their mechanical and electrical properties.
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