G. Bertrand, University of Technology Belfort-Montbeliard, Belfort, France; S. Coste, University of Technology Belfort-Montbeliard, Belfort cedex, France; C. Coddet, University of Technology Belfort-Montbeliard, Belfort Cedex, France; E. Gaffet, University of Technology Belfort - Montbeliard, Belfort Cedex, France; H. Hahn, H. Sieger, Forschungszentrum Karslruhe GmbH, Karslruhe, Germany; C. Meunier, S. VIves, University of Franche Comte, Montbeliard cedex, France
Al
2O
3-TiO
2 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 Al
2O
3-TiO
2 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 TiO
2 II phase.
The milled powders were then granulated before plasma sprayed with an Ar:H
2 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)
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.
