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

doi:10.26599/JAC.2024.9220862

IMR OpenIR

	Microstructure, elastic/mechanical and thermal properties of CrTaO4: A new thermal barrier material?
	Zhang, Shuang 1; Wang, Xiaohui 2; Zhang, Chao 2; Xiang, Huimin 1; Li, Yingwei 3; Fang, Cheng 1; Li, Mingliang 1; Wang, Hailong 1; Zhou, Yanchun 1
通讯作者	Wang, Xiaohui(wang@imr.ac.cn) ; Zhou, Yanchun(yczhou@alum.imr.ac.cn)
	2024-03-01
发表期刊	JOURNAL OF ADVANCED CERAMICS
ISSN	2226-4108
卷号	13 期号:3 页码:373-387
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.
关键词	CrTaO 4 synthesis microstructure mechanical and thermal properties melting point thermal conductivity thermal expansion coefficient
资助者	National Natural Science Foundation of China
DOI	10.26599/JAC.2024.9220862
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:001223026200003
出版者	TSINGHUA UNIV PRESS
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186328
专题	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.