Making high-performance Al2O3-3YSZ ceramics with eutectic/ polycrystalline structure by hot-pressing eutectic powders

被引:1
作者
Yu, Wanjun [1 ]
Ding, Qizhang [1 ]
Zheng, Yongting [2 ,3 ]
Zhang, Xinqiu [1 ]
Yuan, Yuchen [2 ,3 ]
Yu, Yongdong [4 ]
Li, Xiangming [1 ]
机构
[1] Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150080, Peoples R China
[3] Harbin Inst Technol, Ctr Composite Mat & Struct, Harbin 150080, Peoples R China
[4] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China
基金
中国国家自然科学基金;
关键词
Eutectic ceramic; Combustion synthesis; Toughening mechanism; MECHANICAL-PROPERTIES; MICROSTRUCTURE;
D O I
10.1016/j.ceramint.2023.12.106
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
In this communication, the Al2O3-3YSZ ceramic (AYC) was prepared by hot -pressing the eutectic powders. A continuous transition from raw powders mixture to synthesized eutectic powders to sintered eutectic bulk was traced and investigated. The AYC well preserves the structure and phase composition of the original Al2O3-3YSZ eutectic powders (AYEP), which possess a eutectic/polycrystalline composite structure. The average interphase spacing of eutectic region in AYC reaches 106 nm. The strength, toughness, and hardness of AYC specimen are as high as 768 +/- 23 MPa, 8.17 +/- 0.30 MPa m1/2, and 19.04 +/- 0.45 GPa, which far surpasses other solidified and sintered Al2O3-based eutectic ceramics. The excellent mechanical properties can be attributed to the synergistic toughening mechanisms of intergranular/transgranular fracture, t -m phase transformation and residual stress. These results clearly demonstrate the feasibility of sintering eutectic powders method to fabricate Al2O3-based eutectic ceramics concurrent with fine structure and large dimension.
引用
收藏
页码:8527 / 8534
页数:8
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