Toughening mechanisms of ZTA ceramics at cryogenic temperature (77 K)

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• 作者：Juan Chen ; Zhipeng Xie ; ^{xzp@mail.tsinghua.edu.cn} ; Weining Zeng ; Weiwei Wu
• 关键词：ZTA ; Cryogenic temperature ; Toughening mechanism ; Stress-induced martensitic transformation
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：3970-3974
• 全文大小：1154 K
• 卷排序：43

文摘

ZTA ceramics containing 20 wt% 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 298 K and 77 K 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 298 K to 77 K. Therefore, the transformation toughening effect would become stronger, result in the increase of mechanical properties.