| Atmospheric Plasma Spraying of High-Energy Ball-Milled Al2O3-TiO2 Powders | ||
| Dr. Ghislaine Bertrand1, Sandrine Coste1, Christian Coddet1, Dr. Eric Gaffet2, Dr. Horst Hahn3, H Sieger3, Dr. Cathy Meunier4 and Dr. Serge VIves4, 1LERMPS, University of Technology Belfort-Montbeliard, Sevenans, Belfort cedex, 90010, France, 2NRG-UMR 5060 CNRS, University of Technology Belfort - Montbeliard, Sevenans, Belfort Cedex, 90010, France, 3Institute of Nanotechnology, Forschungszentrum Karslruhe GmbH, P.O. Box 3640, Karslruhe, 76021, Germany, 4FEMTO-CREST CNRS-UMR 6000, University of Franche Comte, Pole Universitaire de Montbeliard, 4 place tharradin, Montbeliard cedex, 25211, France Al2O3-TiO2 materials are very attractive materials for the manufacturing of wear resistant ceramics. Moreover, nanostructured coatings show superior properties (higher hardness and enhanced fracture toughness) as compared to their counterparts containing microscale grains. The aim of this study is to elaborate nanostructured Al2O3-TiO2 coatings through the metastable plasma spraying process. The starting powders containing 13wt% and 44wt% of titania, have been mechanically activated by milling using a planetary mill, P4 (Fritsch) with steel vials and balls in such conditions to obtained the high pressure TiO2 II phase. The milled powders were then granulated before plasma sprayed with an Ar:H2 gas mixture, by varying the plasma parameters (gas flow rates, nozzle diameter, aggregates size). The effect of the milling and the spraying conditions on the crystalline phases and the microhardness of the coatings was evaluated.
This research work is supported by the NAMAMET STREP European program (NMP3-CT-2004-001470) | ||