Microstructure-mechanical behaviour relationship in alumina-calcium exaluminate composites
Keywords:Ceramic-ceramic composites, Alumina, Calcium hexaluminate, Colloidal processing, Sintering, Microstructure, Toughness,
The grain growth behaviour of dense alumina materials has been modified by the addition of calcium hexaluminate particles. Maximum dispersion has been obtained by colloidal processing routes. The influence of sintering temperature (1500-1600 °C) on the size and shape of the alumina grains has been established. The mechanical behaviour of three composite materials with the same composition (≈10 vol % CA6) and large microstructural differences has been studied in comparison with that of monophasic alumina of the same grain size. The influence of grain size and shape on toughness has been established. R-curve behaviour has been detected during fracture of the material with the alumina grains presenting the largest shape factor.
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