气候变化领域集成服务门户(CCPortal): Doubled J (c) of Bi2Sr2CaCu2O (x) wires by partial melting and recrystallization heat treatment under 10 bar after vacuum degassing of the precursor powder and pre-densifying of the wires

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DOI	10.1088/1361-6668/ac2ec9
	Doubled J (c) of Bi2Sr2CaCu2O (x) wires by partial melting and recrystallization heat treatment under 10 bar after vacuum degassing of the precursor powder and pre-densifying of the wires
	Hao, Q.; Li, C.; Xu, X.; Jiao, G.; Liu, G.; Zheng, H.; Qin, J.; Jin, L.; Zhang, S.; Li, G.; Bai, L.; Feng, J.
通讯作者	Hao, Q ; Li, C (通讯作者)，Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China.
发表日期	2021
ISSN	0953-2048
EISSN	1361-6668
卷号	34 期号:12
英文摘要	Final heat treatment involving partial melting and recrystallization under a high pressure of 50-100 bar is not conducive to the preparation of Bi2Sr2CaCu2O (x) (Bi2212) magnets; it also greatly increases the cost of research into Bi2212 wires. To solve these problems, in this work a final heat treatment under 10 bar was used to prepare Bi2212 wires with a high bulk density and high critical current density (J (c)). The ambient pressure of the final heat treatment in this paper is only one-fifth of that of the traditional overpressure for final heat treatment of Bi2212 wires. The J (c) of the wires is more than 2.4 times higher than that of Bi2212 wires with a final heat treatment at 1 bar and is consistent with that of samples having a final heat treatment at the traditional 50-100 bar. The reason why the ambient pressure of the final heat treatment can be greatly reduced in this work is: (a) vacuum degassing of the precursor powder eliminated the adsorption and interstitial impurity gases in the long Bi2212 wires, and reduced the internal gas pressure of the wires; (b) pre-treatment at 800 degrees C and 250 bar compressed the Bi2212 wires to their full density. Thus, during the subsequent final heat treatment, the low ambient pressure of 10 bar can overcome the difference between the residual gas pressure inside the wires and the yield strength or creep strength of the Ag sheath, and prevent expansion of the internal gas in the wires, so that the Bi2212 wires are always close to full density. The ambient pressure of the final heat treatment in this paper needs to prevent the expansion of the Bi2212 wires not compress them, so the pressure can be very low. The 10 bar low pressure final heat treatment will solve the problems of the high cost of research into Bi2212 wires and the difficult overpressure heat treatment of Bi2212 magnets.
英文关键词	Bi2212 wires; partial melting and recrystallization heat treatment; low pressure; high density; high J (c)
语种	英语
WOS研究方向	Physics
WOS类目	Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000714224900001
来源期刊	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253697
作者单位	[Hao, Q.; Li, C.; Xu, X.; Jiao, G.; Liu, G.; Zheng, H.; Jin, L.; Zhang, S.; Li, G.; Bai, L.; Feng, J.] Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China; [Qin, J.] Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China
推荐引用方式 GB/T 7714	Hao, Q.,Li, C.,Xu, X.,et al. Doubled J (c) of Bi2Sr2CaCu2O (x) wires by partial melting and recrystallization heat treatment under 10 bar after vacuum degassing of the precursor powder and pre-densifying of the wires[J]. 中国科学院西北生态环境资源研究院,2021,34(12).
APA	Hao, Q..,Li, C..,Xu, X..,Jiao, G..,Liu, G..,...&Feng, J..(2021).Doubled J (c) of Bi2Sr2CaCu2O (x) wires by partial melting and recrystallization heat treatment under 10 bar after vacuum degassing of the precursor powder and pre-densifying of the wires.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,34(12).
MLA	Hao, Q.,et al."Doubled J (c) of Bi2Sr2CaCu2O (x) wires by partial melting and recrystallization heat treatment under 10 bar after vacuum degassing of the precursor powder and pre-densifying of the wires".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 34.12(2021).