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Elaboration of Alumina-Zirconia Composites: Role of the Zirconia Content on the Microstructure and Mechanical Properties
Laboratorio di Tecnologia ed Ingegnerizzazione dei Materiali Ceramici (LINCE) Lab., Department of Applied Science and Technology, INSTM R.U. PoliTO, Politecnico di Torino, Corso Duca degli Abruzzi, 24, Torino 10129, Italy
Université de Lyon, INSA-Lyon, MATEIS UMR CNRS 5510, Bât. Blaise Pascal 7, Av. Jean Capelle, Villeurbanne 69621, France
Institut Universitaire de France, 103 bd Saint-Michel, Paris 75005, France
* Author to whom correspondence should be addressed.
Received: 2 April 2013; in revised form: 22 April 2013 / Accepted: 3 May 2013 / Published: 16 May 2013
Abstract: Alumina-zirconia (AZ) composites are attractive structural materials, which combine the high hardness and Young’s modulus of the alumina matrix with additional toughening effects, due to the zirconia dispersion. In this study, AZ composites containing different amounts of zirconia (in the range 5–20 vol %) were prepared by a wet chemical method, consisting on the surface coating of alumina powders by mixing them with zirconium salt aqueous solutions. After spray-drying, powders were calcined at 600 °C for 1 h. Green bodies were then prepared by two methods: uniaxial pressing of spray-dried granules and slip casting of slurries, obtained by re-dispersing the spray dried granulates. After pressureless sintering at 1500 °C for 1 h, the slip cast samples gave rise to fully dense materials, characterized by a quite homogeneous distribution of ZrO2 grains in the alumina matrix. The microstructure, phase composition, tetragonal to monoclinic transformation behavior and mechanical properties were investigated and are here discussed as a function of the ZrO2 content. The material containing 10 vol % ZrO2 presented a relevant hardness and exhibited the maximum value of KI0, mainly imputable to the t → m transformation at the crack tip.
Keywords: Al2O3-ZrO2; nanocomposites; microstructure; mechanical properties
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Naglieri, V.; Palmero, P.; Montanaro, L.; Chevalier, J. Elaboration of Alumina-Zirconia Composites: Role of the Zirconia Content on the Microstructure and Mechanical Properties. Materials 2013, 6, 2090-2102.
Naglieri V, Palmero P, Montanaro L, Chevalier J. Elaboration of Alumina-Zirconia Composites: Role of the Zirconia Content on the Microstructure and Mechanical Properties. Materials. 2013; 6(5):2090-2102.
Naglieri, Valentina; Palmero, Paola; Montanaro, Laura; Chevalier, Jérôme. 2013. "Elaboration of Alumina-Zirconia Composites: Role of the Zirconia Content on the Microstructure and Mechanical Properties." Materials 6, no. 5: 2090-2102.