Article: Alumina-YAG composites: preparation, experimental characterisation and numerical modelling Journal: International Journal of Materials and Product Technology (IJMPT) 2009 Vol.35 No.3/4 pp.392 - 406 Abstract: Al<SUB align="right">2</SUB>O<SUB align="right">3</SUB>/YAG composite powders have been synthesised by reverse strike precipitation. The powders were characterised by DTA/TG simultaneous analysis; the phase evolution was studied by XRD analysis, while the crystallite formation and growth were followed by TEM observations. A fully dense, homogenous material was obtained by sintering 900°C pre-treated powders at 1600°C for 3 h. For limiting grain growth, both a doping with 500 ppm MgO followed by a free sintering and a fast sintering procedure involving a high heating rate (50°C/min) were performed. The sintered bodies were then characterised by SEM observation and Vickers indentation. Moreover, a numerical model was employed in order to estimate the mechanical properties of the composite materials starting from their microstructural features and from the single constituent phase properties. Inderscience Publishers - linking academia, business and industry through research

Title: Alumina-YAG composites: preparation, experimental characterisation and numerical modelling

Authors: V. Cannillo, P. Palmero, T. Manfredini, L. Montanaro

Addresses: Dipartimento di Ingegneria dei Materiali e dell'Ambiente, University of Modena and Reggio Emilia, via Vignolese 905, 41100 Modena, Italy. ' Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, UdR PoliTO – INSTM, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy. ' Dipartimento di Ingegneria dei Materiali e dell'Ambiente, University of Modena and Reggio Emilia, via Vignolese 905, 41100 Modena, Italy. ' Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, UdR PoliTO – INSTM, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy

Abstract: Al₂O₃/YAG composite powders have been synthesised by reverse strike precipitation. The powders were characterised by DTA/TG simultaneous analysis; the phase evolution was studied by XRD analysis, while the crystallite formation and growth were followed by TEM observations. A fully dense, homogenous material was obtained by sintering 900°C pre-treated powders at 1600°C for 3 h. For limiting grain growth, both a doping with 500 ppm MgO followed by a free sintering and a fast sintering procedure involving a high heating rate (50°C/min) were performed. The sintered bodies were then characterised by SEM observation and Vickers indentation. Moreover, a numerical model was employed in order to estimate the mechanical properties of the composite materials starting from their microstructural features and from the single constituent phase properties.

Keywords: alumina YAG composites; mechanical properties; numerical modelling; reverse strike precipitation; sintering; microstructure; single constituent phase.

DOI: 10.1504/IJMPT.2009.025689

International Journal of Materials and Product Technology, 2009 Vol.35 No.3/4, pp.392 - 406

Published online: 23 May 2009 *

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Title: Alumina-YAG composites: preparation, experimental characterisation and numerical modelling

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