Ultra-fast high-temperature sintering (UHS) of Ce0.2Zr0.2Y0.2Gd0.2La0.2O2_ 8 fluorite-structured entropy-stabilized oxide (F-ESO)

被引：35
|
作者：
Spiridigliozzi, Luca [1 ]
Dell'Agli, Gianfranco [1 ,2 ]
Esposito, Serena [2 ,3 ]
Rivolo, Paola [3 ]
Grasso, Salvatore [4 ]
Sglavo, Vincenzo M. [2 ,5 ]
Biesuz, Mattia [5 ]
机构：
[1] Univ Cassino & Southern Lazio, Dept Civil & Mech Engn, Via G Biasio 43, I-03043 Cassino, FR, Italy
[2] INSTM Natl Interuniv Consortium Mat Sci & Technol, Via G Giusti 9, I-50121 Florence, Italy
[3] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy
[4] Southwest Jiaotong, Minist Educ, Sch Mat Sci & Engn, Key Lab Adv Technol Mat, Chengdu 610031, Peoples R China
[5] Dept Ind Engn, Via Sommar 9, I-38123 Trento, Italy
来源：
SCRIPTA MATERIALIA | 2022年 / 214卷
关键词：
Ultrafast high-temperature sintering; UHS; High entropy oxides; Fluorite; Co-precipitation; RAPID DENSIFICATION; DESIGN; CERAMICS; 3YSZ;
D O I：
10.1016/j.scriptamat.2022.114655
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Single-phase high entropy fluorite (Ce0.2Zr0.2Y0.2Gd0.2La0.2O2-delta) samples were synthesized by co-precipitation and consolidated by ultrafast high-temperature sintering (UHS) in less than 2 min. The chemical homogeneity of the sintered materials was confirmed by X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDXS), high-resolution EDXS using Transmission Electron Microscopy (TEM), and Raman spectroscopy. Compared to conventional sintering, UHS of high entropy ceramics was a hundred times faster and it resulted in highly dense microstructures (relative density > 93%) with nanometric grains. Ce0.2Zr0.2Y0.2Gd0.2La0.2O2-delta & nbsp;densified under an UHS current of 20-25 A. An optimized step-wise UHS schedule was proposed to obtain dense, single-phase pellets with a reduced amount of defects. The extreme heating rates were found beneficial to limit grain coarsening and to obtain a single phase.
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页数：7
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