Alumina-YAG composites: preparation, experimental characterisation and numerical modelling. (26th May 2009)

• Record Type: Journal Article
• Authors: Cannillo, V.; Palmero, P.; Manfredini, T.; Montanaro, L.
• Is Part Of: International journal of material & product technology. Volume 35:Number 3/4(2009)
• Page Start: 392
• Page End: 406
• Publication Date: 2009-05-26
• Subjects: alumina YAG composites -- mechanical properties -- numerical modelling -- reverse strike precipitation -- sintering -- microstructure -- single constituent phase; Manufacturing processes -- Periodicals; Materials -- Testing -- Periodicals; 620.11
• Languages: English
• ISSNs: 0268-1900

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.