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

被引：31

作者：

Chen, Juan ^{[1
]}

Xie, Zhipeng ^{[1
]}

Zeng, Weining ^{[1
]}

Wu, Weiwei ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2017年 / 43卷 / 05期

基金：

中国国家自然科学基金;

关键词：

ZTA; Cryogenic temperature; Toughening mechanism; Stress-induced martensitic transformation; YTTRIA-STABILIZED ZIRCONIA; FRACTURE-TOUGHNESS; GRAIN-SIZE; TRANSFORMATION-TEMPERATURE; BEHAVIOR; ALUMINA; MICROSTRUCTURE; 2Y-TZP;

D O I：

10.1016/j.ceramint.2016.11.072

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZTA ceramics containing 20 wt% ZrO2 were fabricated at different sintering temperatures (1450, 1500 and 1550 degrees 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.

引用

页码：3970 / 3974

页数：5

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