Critical current degradation and delamination crack observation of epoxy-coated REBCO superconducting tapes after thermal cycles in liquid nitrogen

doi:10.1016/j.ceramint.2021.07.155

	Critical current degradation and delamination crack observation of epoxy-coated REBCO superconducting tapes after thermal cycles in liquid nitrogen
	Yang, Zhirong 1; Song, Peng 1; Guan, Mingzhi 2; Feng, Feng 3; Qu, Timing 1
刊名	CERAMICS INTERNATIONAL
	2021-11-01
卷号	47 期号:21 页码:29824-29831
关键词	Delamination Thermal stress Crack Degradation Impregnation
ISSN号	0272-8842
DOI	10.1016/j.ceramint.2021.07.155
通讯作者	Qu, Timing(tmqu@mail.tsinghua.edu.cn)
英文摘要	The delamination and critical current (I-c) degradation caused by thermal stress after epoxy impregnation are threats for the application of REBa2Cu3O7-x(REBCO, RE = Rare earth) superconducting magnets. In this work, two types of REBCO tapes were coated by Stycast 2850FT with controlled coating geometries. Critical currents of coated samples after thermal cycles in liquid nitrogen were measured. I-c degradation was found in coated samples with a free no-coating edge, when the surface coating layer was thicker than 1000 mu m. It was also found that additional edge coating can help to suppress the I-c degradation. Samples with degraded I-c after thermal cycles showed an obvious delamination phenomenon. The morphology and location of delamination cracks were carefully observed by using focused Ion beam, scanning electron microscope, and transmission electron micro-scope. Delamination cracks propagated within the REBCO layer and stopped at reaching the Silver/REBCO interface. Simulations by finite element method suggest that delamination cracks are generated by the stress accumulation within the REBCO layer, which could be reduced by a full epoxy coating on both tape surface and edges.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB25000000] ; Na-tional Natural Science Foundation of China[52007089] ; Tribology Science Fund of State Key Laboratory of Tribology, China[SKLT2020B01]
WOS关键词	CONDUCTOR ; STRESS ; STRENGTH ; BEHAVIOR ; FILMS ; COIL
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000697448600004
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences ; Na-tional Natural Science Foundation of China ; Tribology Science Fund of State Key Laboratory of Tribology, China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/136539]
专题	中国科学院近代物理研究所
通讯作者	Qu, Timing
作者单位	1.Tsinghua Univ, Dept Mech Engn, State Key Lab Tribol, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 3.Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Lab Intelligent Mfg & Precis Machining, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Yang, Zhirong,Song, Peng,Guan, Mingzhi,et al. Critical current degradation and delamination crack observation of epoxy-coated REBCO superconducting tapes after thermal cycles in liquid nitrogen[J]. CERAMICS INTERNATIONAL,2021,47(21):29824-29831.
APA	Yang, Zhirong,Song, Peng,Guan, Mingzhi,Feng, Feng,&Qu, Timing.(2021).Critical current degradation and delamination crack observation of epoxy-coated REBCO superconducting tapes after thermal cycles in liquid nitrogen.CERAMICS INTERNATIONAL,47(21),29824-29831.
MLA	Yang, Zhirong,et al."Critical current degradation and delamination crack observation of epoxy-coated REBCO superconducting tapes after thermal cycles in liquid nitrogen".CERAMICS INTERNATIONAL 47.21(2021):29824-29831.