Microstructural and Tribological Properties of Al 2 O 3 -13pctTiO 2 Thermal Spray Coatings Deposited by Flame Spraying
- PDF / 1,918,699 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 52 Downloads / 201 Views
N
THE use of coatings for protection against wear and corrosion has a long history. In this context, thermal spray is a technique that produces a wide range of coatings for diverse applications. It involves introducing solid particles (wire or powder) in a flame or plasma jet to melt and accelerate them before they come crashing on the substrate where they form a multilayer.[1–3] Thermal spraying of ceramic coatings is an important method of protecting various metallic parts, which are exposed to very hard
RASSIM YOUNES, Research Scholar, and MOHAND AMOKRANE BRADAI and ABDELHAMID SADEDDINE, Assistant Professors, are with the Laboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, 06000 Bejaia, Algeria. Contact e-mail: [email protected] YOUCEF MOUADJI, Assistant Professor, is with the Laboratory of Mechanics, Faculty of Engineering Sciences, Campus Chaabet-Ersas, University of Constantine, 25000 Constantine, Algeria. ALI BILEK, Professor, is with the Mechanical Laboratory of Structure and Energetic, Mechanical Engineering Department, University of Tizi-Ouzou, 15000 Tizi-Ouzou, Algeria. ABDERRAHIM BENABBAS, Professor, is with the Laboratory Processes for Materials, Energy, Water and Environment, Faculty of Science and Technology, University of Bouira, 10000 Bouira, Algeria. Manuscript submitted March 9, 2015. METALLURGICAL AND MATERIALS TRANSACTIONS B
environments. Hard ceramic coatings are very good candidates for anti-wear and anti-corrosion applications.[4–8] Sprayed Alumina (Al2O3) or alumina-titania (Al2O3-TiO2) coatings have the potential for improvements in the mechanical properties depending on enhancements of physical properties resulting from the microstructure characteristics.[9–11] They are fairly porous, which can be useful under harsh working environments.[12–17] Thermal spray coatings processes, that include plasma, wire-arc, flame and high velocity oxygen fuel, have attracted considerable attention due to their versatile nature and adaptability to spray almost any kind of coating powder (ceramic, metallic, polymeric, or composite) onto almost any substrate material. The use of thermal spray flame wire was initially limited to electric current conductor materials. But, recently new materials have been developed in the form of cored-wires, filled with reinforced alloy powders, ceramic particles is also possible. These cored-wires allow the making of coatings of super alloys and cermets in order to improve the tribological properties.[18] Fervel et al.[19] reported that the coatings wear resistance achieved by plasma deposition from the Al2O3-40pctTiO2 powder (AT-40) was higher than that of deposits developed using powders of Al2O313pctTiO2 (AT-13). In contrary, Habib et al.[20] concluded that the higher hardness of coatings (AT-13) obtained by
oxyacetylene flame was the reason that these coatings were more resistant to abrasive wear by sliding contact such as those developed with powders (AT-40). In another study, Ahn et al.[21] found that low wear resistance of coati
Data Loading...
