TY - GEN A1 - Berger, L.-M. A1 - Woydt, Mathias A1 - Keller, H. A1 - Zimmermann, S. A1 - Schwier, G. A1 - Enzl, R. A1 - Thiele, S. T1 - Tribological behaviour of HVOF-sprayed Cr3C2-NiCr and TiC-based coatings under high temperature dry sliding conditions T2 - Conference proceedings : lectures and posters (ITSC 2004) N2 - In the current study, the tribological properties of TiC-based coatings paired with polycrystalline alumina under unlubricated sliding conditions were investigated in order to demonstrate the technological and engineering potential of such coatings. (Ti,Mo)(C,N)-Co coatings were prepared from an agglomerated and sintered spray powder by HVOF spraying using JP-5000 equipment. Cr3C2-NiCr coatings were studied for comparison. Sliding wear tests were performed over the temperature range from 23°C to 800°C with sliding speeds in the range 0.3-3 m/s, a wear distance of 5000 m and a normal force of 10 N. Wear rates of coatings and sintered alumina counterparts were measured separately. Compared with Cr3C2-NiCr coatings, (Ti,Mo)(C,N)-Co coatings showed significantly lower total wear rates, corresponding to those found in the region of mixed/boundary lubrication. With few exceptions, the coefficients of friction were found to be lower for (Ti,Mo)(C,N)-Co coatings than for Cr3C2-NiCr coatings. After tests were performed, the coating microstructures were studied by optical microscopy and SEM. The oxide scales formed on the coating surfaces were investigated by SEM and X-ray diffraction. Comparison of the total wear rates of the couples consisting of sintered alumina and a (Ti,Mo)(C,N)-Co coating with those of other alumina-ceramic and hardmetal-hard metal tribological systems demonstrates the immense potential of TiC-based coatings for sliding wear applications. T2 - International Thermal Spray Conference & Exposition 2004 CY - Osaka, Japan DA - 2004-05-10 PY - 2004 SN - 3-87155-792-7 SP - 1(?) EP - 10(?) PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-5123 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -