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Dry sliding wear properties of thermal spray coatings in the TiO2-Cr2O3 system

: Berger, Lutz-Michael; Stahr, C.C.; Saaro, S.; Thiele, S.; Woydt, M.


Fischer, A. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel:
Friction, wear and wear protection : International Symposium on Friction, Wear and Wear Protection 2008 Aachen, Germany, from April 9th to 11th, 2008
Weinheim: Wiley-VCH, 2009
ISBN: 978-3-527-32366-1
International Symposium on Friction, Wear and Wear Protection <2008, Aachen>
Fraunhofer IWS ()
Fraunhofer IKTS ()
thermisches Spritzen; Gleitreibung; Reibpaarung; Verschleiß; Verschleißfestigkeit; Titandioxid; Chromoxid; Reibungskoeffizient; Titancarbid; Härte; Hochtemperaturversuch; Verschleißgeschwindigkeit; Gleitgeschwindigkeit

Application of APS- (atmospheric plasma spraying-) sprayed coatings of the TiO2-Cr2O3 system in high-temperature sliding conditions has been studied in this work. Changes in the phase composition from the feedstock powder to the coating occurred as a result of the spray process. The diffraction patterns of the 27/73 and the 23.5/76.5 coatings showed the presence of the high-temperature Magneli phase ('n' phase), while only a Cr2O3 crystal lattice with shifted lattice parameters existed in the 75/25 coating. Inconsistencies in the roughness values obtained for the tested specimen prevented clear conclusions on the influence of the coatings' phase compositions on their dry sliding wear properties from being able to be made. However, all coatings showed very low total wear rates and low COF values at the test temperature of 800 deg C.