Exploration of correlation between the material characteristics of the copper layer on the electrical and thermal properties of REBCO tape and coil

Zhang, Huimin; Suo, Hongli; Zhang, Zili; Ma, Lin; Liu, Jianhua; Wang, Lei; Wang, Qiuliang

doi:10.1016/j.jallcom.2022.166770

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…Structural metals based on pure copper exhibit excellent electrical and thermal properties [1,2]. They have been widely used in electronics, medical equipment, aerospace, and other fields [3].…”

Section: Introductionmentioning

confidence: 99%

Precision Control in Vat Photopolymerization Based on Pure Copper Paste: Process Parameters and Optimization Strategies

et al. 2023

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Vat photopolymerization (VPP) presents new opportunities for metals to achieve the design freedom of components. However, the material properties of copper powder and the inherent defects of the technology seriously hinder its application in high-precision metal additive manufacturing. Precision control is the key to obtaining minimal precision metal parts when copper is prepared by reduction photopolymerization. This paper employed variance analysis (ANOVA) and root mean square deviation (RMSD) to determine the significant parameters affecting dimensional accuracy and their optimal regions. The results show that printing accuracy is improved by optimizing exposure time, intensity, layer thickness, and sweeper moving speed. When the exposure time is 21 s, and the exposure intensity is 220 mW/cm2, a hole with a height of 1 mm and a diameter of 200 μm can be printed with a minimum size deviation of 51 μm. In addition, RMSD and ANOVA provide an effective method for realizing high-precision stereolithography 3D printing metal copper, expanding the material adaptation in the 3D printing metals field. The study highlights the potential of VPP as a method for preparing metals in future studies.

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Section: Introductionmentioning

confidence: 99%

Precision Control in Vat Photopolymerization Based on Pure Copper Paste: Process Parameters and Optimization Strategies

et al. 2023

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“…Many studies have revealed that various factors such as the distribution of defects (i.e. cracks) have a significant impact on the electro-mechanical behaviors of 2G-HTS tapes under strain/stress [13][14][15][16][17][18]. Under complex and extreme strain/stress conditions, edge defects caused by mechanical slitting could become the initial of crack propagation and/or delamination, consequently reducing the mechanical strength of 2G-HTS tapes and the robustness of their electromechanical behaviors [19].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electro-mechanical behaviors in RE–Ba–Cu–O composite superconducting tapes with laser slit edges

Guo

Chen²,

liu³

et al. 2022

Supercond. Sci. Technol.

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The slit technique is an essential process for narrowing the second-generation high-temperature superconducting tapes (2G-HTS). It is still very challenging to eliminate edge defects introduced during slitting. In this work, we developed a set of reel-to-reel laser slit equipment for narrowing 2G-HTS tapes using a femtosecond infrared laser. In comparison with the commonly used mechanical slit (MS) technique, the laser slit (LS) technique produced no cracks at the tape edges. Electro-mechanical behaviors of 2G-HTS tapes with MS and LS edges were compared in liquid nitrogen conditions. The results of the uniaxial tensile tests showed only a minor difference in irreversible tensile stress/strain of the two kinds of tapes. However, uniaxial tensile fatigue tests showed that the critical current (Ic) retention of the LS tapes was about 14% higher than that of the MS tapes after 104 cycles (@ 77 K, σmax = 0.8σy, and a stress ratio of 0.1). Moreover, U-Spring compressive tests revealed that no irreversible Ic degradation occurred on the LS tapes under compressive strain up to -0.8%, with high reproducibility. On the contrary, the irreversible compressive strains of the MS tapes were rather scattered, ranging from -0.75% to -0.2%. Enhancement of electro-mechanical behaviors is strongly linked to fewer edge defects in the LS tapes. This research demonstrates significant advantages of the laser slit technique over the conventional mechanical slit technique, showing its promising prospects for demanding applications.

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Aging effect on copper stabilizers in second-generation high-temperature superconducting tapes

Guo,

Yu,

et al. 2023

Materials Characterization

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Exploration of correlation between the material characteristics of the copper layer on the electrical and thermal properties of REBCO tape and coil

Cited by 7 publications

References 46 publications

Precision Control in Vat Photopolymerization Based on Pure Copper Paste: Process Parameters and Optimization Strategies

Precision Control in Vat Photopolymerization Based on Pure Copper Paste: Process Parameters and Optimization Strategies

Enhancement of electro-mechanical behaviors in RE–Ba–Cu–O composite superconducting tapes with laser slit edges

Aging effect on copper stabilizers in second-generation high-temperature superconducting tapes

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