The Microstructure Evolution and Mechanical Properties of Al2O3/ZrO2 Coatings with Different ZrO2 Contents: Guidelines to Prepare Eutectic Powders

被引:1
作者
Yu, Wanjun [1 ]
Ding, Qizhang [1 ]
Yu, Yongdong [2 ,3 ]
Pan, Jiayu [4 ]
Liu, Xudong [2 ,3 ]
Yuan, Yuchen [2 ,3 ]
Li, Xiangming [1 ]
Zheng, Yongting [2 ,3 ]
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] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
Al2O3; ZrO2; ceramic coatings; eutectic powders; mechanical properties; microstructure evolution; COMBUSTION SYNTHESIS; CERAMICS; GROWTH;
D O I
10.1007/s11665-023-08388-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The Al2O3/ZrO2 coatings (AZ-Cs) with different ZrO2 contents were prepared via Al-Zr(NO3)(4) combustion-assisted thermal spraying (CATS) method, and its microstructure evolution, mechanical properties were analyzed by experimental observation and finite element simulation. The results show that along the solidification direction, AZ-Cs contain four different microstructure regions of nano-crystalline, nano-eutectic, equiaxial eutectic and submicron eutectic. The microstructures characteristics of AZ-Cs are drawn based on cooling rates of these regions, and the microstructure evolution mechanism of AZ-Cs is attributed to the solute diffusion during the non-equilibrium solidification process. The hardness and toughness of AZ-Cs reach up to 21.51 +/- 0.44 GPa and 5.4 +/- 0.25 MPa m(1/2), which far surpass these values for Al2O3/ZrO2 ceramics coatings prepared by air plasma spraying (APS). Subsequently, the Al2O3/45 mol.% ZrO2 hypereutectic powders were successfully synthesized by combustion-assisted gas atomization (CAGA) method. There is a regular spherical morphology to the powders, and the insides have typical eutectic structure. The ultra-high cooling rates supplied by CAGA greatly broadens the Al2O3/ZrO2 pseudoeutectic region. Consequently, the microstructure evolution mechanism of AZ-Cs provides a theoretical guidance to prepare high-quality eutectic powders.
引用
收藏
页码:6000 / 6013
页数:14
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