Effect of SiC buffer layer on flux pinning property of MgB2 tapes

Kang, Byeongwon; Putri, W. B. K.; Kang, Won Nam

doi:10.1016/j.cap.2019.03.012

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…As shown in Figure c,d, the fitting results for all samples at both temperatures reveal no significant difference with the ZnO thickness having β of ∼0.96 for 5 K and ∼0.78 for 20 K, indicating a weak collective pinning mechanism. , These results directly contradict those of SiC-buffered MgB 2 . The SiC buffer layer produced a systematic decrease in the β values with respect to the thickness at both temperatures, along with degradation of the J c values . These comparative results indicate that the flux pinning properties of MgB 2 vary depending on the buffer layer underneath MgB 2 .…”

Section: Resultsmentioning

confidence: 79%

“…The SiC buffer layer produced a systematic decrease in the β values with respect to the thickness at both temperatures, along with degradation of the J c values. 33 These comparative results indicate that the flux pinning properties of MgB 2 vary depending on the buffer layer underneath MgB 2 .…”

Section: Resultsmentioning

confidence: 85%

“…This underlying mechanism of T c fluctuation has been confirmed by extended X-ray absorption fine structure (EXAFS) measurements. 30 This local structural distortion may introduce additional pinning centers besides the conventional grain boundary pinning 31 − 33 and affect the pinning behavior of MgB 2 .…”

Section: Introductionmentioning

confidence: 99%

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Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films

Putra

Jung

et al. 2023

ACS Omega

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We investigated the flux pinning properties in terms of the critical current density (J c) and pinning force density (F p) of MgB2 films with ZnO buffer layers of various thicknesses. At higher thicknesses of the buffer layer, significantly larger J c values are observed in the high-field region, whereas J c values in the low- and intermediate-field regions remain largely unaffected. A secondary point-pinning mechanism other than primary grain boundary pinning is observed in the F p analysis, which depends on the thickness of the ZnO buffer layer. Moreover, a close relationship between the Mg and B bond ordering and the fitting parameter of secondary pinning is obtained, indicating that the local structural distortion of MgB2 induced by ZnO buffer layers with different thicknesses may contribute to flux-pinning enhancement in the high-field region. Discovering further advantages of ZnO as a buffer layer other than the delamination resistance it provides will help to develop a MgB2 superconducting cable with a high J c for power applications.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 85%

See 1 more Smart Citation

Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films

Putra

Jung

et al. 2023

ACS Omega

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“…It is reported that the addition of SiC can significantly reduce the sintering temperature and promote mass diffusion [12]. TiC-SiC ceramics were prepared by Cabrero et al [13] using SPS sintering method at 1800 • C, and its relative density reached 99.23%, and its vickers hardness reached an astonishing 31 GPa, it may be due to the fact that SiC itself is a hard phase, and the pinning effect of SiC inhibits the aggregation of TiC grains [14]. Carbon fiber has many interesting properties, such as high-temperature forbearance, high tensile strength and stiffness, and low weight [15], these properties have attracted much attention in aerospace and civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

et al. 2021

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TiC ceramics have become one of the most potential ultra-high temperature structural materials, because of its high melting point, low density, and low price. However, the poor mechanical properties seriously limit its development and application. In this work, this review follows PRISMA standards, the mechanism of the second phase (particles, whiskers, and carbon nanotubes) reinforced TiC ceramics was reviewed. In addition, the effects of the second phase on the microstructure, phase composition and mechanical properties of TiC ceramics were systematically studied. The addition of carbon black effectively eliminates the residual TiO2 in the matrix, and the bending strength of the matrix is effectively improved by the strengthening bond formed between TiC; SiC particles effectively inhibit the grain growth through pinning, the obvious crack deflection phenomenon is found in the micrograph; The smaller grain size of WC plays a dispersion strengthening role in the matrix and makes the matrix uniformly refined, and the addition of WC forms (Ti, W) C solid solution, WC has a solid solution strengthening effect on the matrix; SiC whiskers effectively improve the fracture toughness of the matrix through bridging and pulling out, the microscopic diagram and mechanism diagram of SiC whisker action process are shown in this paper. The effect of new material carbon nanotubes on the matrix is also discussed; the bridging effect of CNTs can effectively improve the strength of the matrix, during sintering, some CNTs were partially expanded into GNR, in the process of crack bridging and propagation, more fracture energy is consumed by flake GNR. Finally, the existing problems of TiC-based composites are pointed out, and the future development direction is prospected.

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Evidence of disordered local structure of ZnO buffered MgB2 films via polarized extended X-ray absorption fine structure analysis

Putra,

Oh,

Angga Anugrah

et al. 2024

Applied Surface Science

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Effect of SiC buffer layer on flux pinning property of MgB2 tapes

Cited by 5 publications

References 23 publications

Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films

Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films

Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

Evidence of disordered local structure of ZnO buffered MgB2 films via polarized extended X-ray absorption fine structure analysis

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Effect of SiC buffer layer on flux pinning property of MgB2 tapes

Cited by 5 publications

References 23 publications

Enhancement in High-Field Jc Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB2 Films

Enhancement in High-Field Jc Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB2 Films

Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

Evidence of disordered local structure of ZnO buffered MgB2 films via polarized extended X-ray absorption fine structure analysis

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Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films

Enhancement in High-Field J_c Properties and the Flux Pinning Mechanism of ZnO-Buffered MgB₂ Films