Alumina-YAG composites: preparation, experimental characterisation and numerical modelling
Source: International Journal of Materials and Product Technology, Volume 35, Numbers 3-4, 23 May 2009 , pp. 392-406(15)
Publisher: Inderscience Publishers
Abstract:Al<SUB align=right>2O<SUB align=right>3/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.
Document Type: Research article
Affiliations: 1: Dipartimento di Ingegneria dei Materiali e dell 2: Ambiente, University of Modena and Reggio Emilia, via Vignolese 905, 41100 Modena, Italy. 3: Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, UdR PoliTO - INSTM, Politecnico di Torino, corso Duca degli Abruzzi 24, 10129 Torino, Italy.
Publication date: 2009-05-23
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