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 fromthe single constituent phase properties.
Alumina-YAG composites: preparation, experimental characterization and numerical modelling / Cannillo, Valeria; P., Palmero; Manfredini, Tiziano; L., Montanaro. - In: INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY. - ISSN 0268-1900. - STAMPA. - 35:3-4(2009), pp. 392-406. [10.1504/ijmpt.2009.025689]
Alumina-YAG composites: preparation, experimental characterization and numerical modelling
CANNILLO, Valeria;MANFREDINI, Tiziano;
2009
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 fromthe single constituent phase properties.Pubblicazioni consigliate
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