Abstract
This study investigated the effect of soaking time on the phase composition, physical and mechanical properties of strontium hexaaluminate/zirconia-toughened alumina (ZTA) composites prepared via the in situ technique. X-ray diffraction (XRD), scanning electron microscopy and mechanical testing techniques for flexural strength, Vickers hardness and fracture toughness were employed to find accurate relationships between the soaking time and the sintered composite properties. The obtained results showed that increasing the soaking time positively affected the bulk density, whereas the soaking time had almost no effect on the phase composition. There were multiple toughening mechanisms that influenced the fracture toughness of the sintered composites soaked for longer soaking times. The improvement of the 10 mass% SrAl12O19 is due to the glassy phase formation enhanced by the presence of SiO2 and MgO. The optimum fracture toughness was obtained with the addition of 30 mass%, while the increase in the plate-like grains annihilated the fracture toughness of the samples containing 40 mass% SrAl12O19.
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