Title: Comparison between plasma- and HVOF-sprayed ceramic coatings. Part II: tribological behaviour

Authors: G. Bolelli, L. Lusvarghi, T. Manfredini, F. Pighetti Mantini, E. Turunen, T. Varis, S-P. Hannula

Addresses: Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universita di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy. ' Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universita di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy. ' Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universita di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy. ' Dipartimento di Ingegneria dei Materiali e dell'Ambiente, Universita di Modena e Reggio Emilia, Via Vignolese 905, 41100 Modena, Italy. ' VTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT, Finland. ' VTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT, Finland' VTT Technical Research Centre of Finland, P.O. Box 1000, FIN-02044 VTT, Finland; Laboratory of Materials Science, Helsinki University of Technology (TKK), P.O. Box 6200, FIN-02015 TKK, Finland

Abstract: This is the second part of comparative study between High Velocity Oxygen-Fuel (HVOF) flame-sprayed and Atmospheric Plasma-Sprayed (APS) ceramics. Dry particles abrasion test and dry sliding wear test at room temperature, 400°C and 700°C are performed. In dry sliding against SiC, at room temperature stable tribofilms are formed and mild wear (<10-6 mm³/(Nm)) occurs for all coatings. When temperature and normal load increase, making brittle cracking a significant wear mechanism, HVOF coatings become superior to APS ones, thanks to higher toughness. In dry particles abrasion, brittle fracture prevails; therefore, the tougher HVOF coatings outperform APS ones.

Keywords: high velocity oxygen fuel; HVOF flame spraying; plasma spraying; ceramic coatings; ; tribology; Al2O3; Cr2O3; pin-on-disk wear tests; dry particles abrasion tests; dry sliding; silicon carbide; brittle cracking; brittle fracture; tribofilms.

DOI: 10.1504/IJSURFSE.2007.013621

International Journal of Surface Science and Engineering, 2007 Vol.1 No.1, pp.62 - 79

Published online: 09 May 2007 *

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