Abstract
ZTA ceramics containing 20wt% ZrO2 were fabricated at different sintering temperatures (1450, 1500 and 1550°C) by SPS and HP processes, respectively. The influence of sintering process on the mechanical properties of ZTA ceramics at 298K and 77K was investigated. It can be seen that the bending strength and fracture toughness of samples prepared by the two processes both improved at cryogenic temperature. The stress-induced martensitic transformation toughening mechanism was confirmed by the in-situ Raman technique. The tetragonal ZrO2 would be even more easy to transform because of the residual stress generated when temperature decreased from 298K to 77K. Therefore, the transformation toughening effect would become stronger, result in the increase of mechanical properties.
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