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Microstructure, elastic/mechanical and thermal properties of CrTaO4: A new thermal barrier material?

文献类型：期刊论文

作者Zhang, Shuang1; Wang, Xiaohui2; Zhang, Chao2; Xiang, Huimin1; Li, Yingwei3; Fang, Cheng1; Li, Mingliang1; Wang, Hailong1; Zhou, Yanchun1
刊名JOURNAL OF ADVANCED CERAMICS
出版日期2024-03-01
卷号13期号:3页码:373-387
关键词CrTaO 4 synthesis microstructure mechanical and thermal properties melting point thermal conductivity thermal expansion coefficient
ISSN号2226-4108
DOI10.26599/JAC.2024.9220862
通讯作者Wang, Xiaohui(wang@imr.ac.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn)
英文摘要CrTaO 4 (or Cr 0.5 Ta 0.5 O 2 ) has been unexpectedly found to play a decisive role in improving the oxidation resistance of Cr and Ta-containing refractory high -entropy alloys (RHEAs). This rarely encountered complex oxide can effectively prevent the outward diffusion of metal cations from the RHEAs. Moreover, the oxidation kinetics of CrTaO 4 - forming RHEAs is comparable to that of the well-known oxidation resistant Cr 2 O 3 - and Al 2 O 3 -forming Ni-based superalloys. However, CrTaO 4 has been ignored and its mechanical and thermal properties have yet to be studied. To fill this research gap and explore the untapped potential for its applications, here we report for the first time the microstructure, mechanical and thermal properties of CrTaO 4 prepared by hot-press sintering of solid-state reaction synthesized powders. Using the HAADF and ABF-STEM techniques, rutile crystal structure was confirmed and short range ordering was directly observed. In addition, segregation of Ta and Cr was identified. Intriguingly, CrTaO 4 exhibits elastic/mechanical properties similar to those of yttria stabilized zirconia (YSZ) with Young's modulus, shear modulus, and bulk modulus of 268, 107, and 181 GPa, respectively, and Vickers hardness, flexural strength, and fracture toughness of 12.2 +/- 0.44 GPa, 142 +/- 14 MPa, and 1.87 +/- 0.074 MPam 1/2 . The analogous elastic/mechanical properties of CrTaO 4 to those of YSZ has spurred inquiries to lucrative leverage it as a new thermal barrier material. The measured melting point of CrTaO 4 is 2103 +/- 20 K. The anisotropic thermal expansion coefficients are alpha a = (5.68 +/- 0.10)x10 -6 K -1 , alpha c = (7.81 +/- 0.11)x10 -6 K -1 , with an average thermal expansion coefficient of (6.39 +/- 0.11)x10 -6 K -1 . The room temperature thermal conductivity of CrTaO 4 is 1.31 Wm -1 K -1 and declines to 0.66 Wm -1 K -1 at 1473 K, which are lower than most of the currently well-known thermal barrier materials. From the perspective of matched thermal expansion coefficient, CrTaO 4 pertains to an eligible thermal barrier material for refractory metals such as Ta, Nb, and RHEAs, and ultrahigh temperature ceramics. As such, this work not only provides fundamental microstructure, elastic/mechanical and thermal properties that are instructive for understanding the protectiveness displayed by CrTaO 4 on top of RHEAs but also outreaches its untapped potential as a new thermal barrier material.
资助项目National Natural Science Foundation of China[U23A20562] ; National Natural Science Foundation of China[52302074]
WOS研究方向Materials Science
语种英语
WOS记录号WOS:001223026200003
出版者TSINGHUA UNIV PRESS
资助机构National Natural Science Foundation of China
源URL  
专题金属研究所_中国科学院金属研究所
通讯作者Wang, Xiaohui; Zhou, Yanchun
作者单位1.Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
3.Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Shuang,Wang, Xiaohui,Zhang, Chao,et al. Microstructure, elastic/mechanical and thermal properties of CrTaO4: A new thermal barrier material?[J]. JOURNAL OF ADVANCED CERAMICS,2024,13(3):373-387.
APA Zhang, Shuang.,Wang, Xiaohui.,Zhang, Chao.,Xiang, Huimin.,Li, Yingwei.,...&Zhou, Yanchun.(2024).Microstructure, elastic/mechanical and thermal properties of CrTaO4: A new thermal barrier material?.JOURNAL OF ADVANCED CERAMICS,13(3),373-387.
MLA Zhang, Shuang,et al."Microstructure, elastic/mechanical and thermal properties of CrTaO4: A new thermal barrier material?".JOURNAL OF ADVANCED CERAMICS 13.3(2024):373-387.

入库方式： OAI收割

来源：金属研究所

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