Novel ultra-sonic boron refinement in distilled water for cost-efficient fabrication of MgB2 bulk ceramic superconductors

Arvapalli, Sai Srikanth; Muralidhar, M.; Sakai, Naomichi; Murakami, Masato; Jirsa, M.

doi:10.1016/j.ceramint.2022.06.115

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…This technique is scalable and does not result in B 2 O 3 formation and contamination by other impurities. It proved to be a cost-effective way, how to refine the cheap commercial micro-crystalline boron to nanoscale [153][154][155]. The ultra-sonicated boron increased grain boundary pinning and resulted in a high J c .…”

Section: Ultra-sonically Refined Boronmentioning

confidence: 99%

Review on high-performance bulk MgB₂ superconductors

Muralidhar,

Shadab,

Sai Srikanth

et al. 2023

J. Phys. D: Appl. Phys.

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Although the fascinating effect of superconductivity was discovered more than one hundred years ago, only a few low-temperature superconductors, especially Nb3Sn and NbTi, have reached everyday-life use. After the discovery of superconductivity in MgB2 in 2001, a boom appeared in interest in employing MgB2 in commercial applications, facilitated by simple crystallographic structure, high critical temperature, low-cost raw ingredients, simple and fast production, and other advantages for moderate temperature applications. It only lacks high flux pinning and good mechanical performance. In this review, the implications of manufacturing procedures on the superconducting properties, crystal and electronic structure of MgB2 are discussed. The advantages and drawbacks of various manufacturing processes will be presented, as well as the ways how to improve MgB2 superconducting performance. The impact of oxygen reduction, elements doping, the introduction of defects and additives, and the effect of precursor refinement on superconducting properties are here compiled to give an overview of the progress of flux pinning enhancement in bulk MgB2.

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Section: Ultra-sonically Refined Boronmentioning

confidence: 99%

Review on high-performance bulk MgB₂ superconductors

Muralidhar,

Shadab,

Sai Srikanth

et al. 2023

J. Phys. D: Appl. Phys.

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“…Although a lot of efforts have been made in order to fabricate more and more efficient shields, both improving the material properties and optimizing the manufact shape [17][18][19], the SC shield performances can still be weakened by different uncontrolled causes, such as quench phenomena or other thermomagnetic instabilities [20]. In the case of MgB 2 samples, despite the improvements in the fabrication processes, thermomagnetic instabilities such as flux jumps still occur at low operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flux-jump occurrence in a cup-shaped MgB₂ bulk for magnetic shielding applications

Fracasso

Gömöry

Solovyov

et al. 2023

Supercond. Sci. Technol.

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MgB2 is one of the most promising materials for superconducting bulk applications. However, thermomagnetic instabilities can arise in the material because of its low heat capacity and thermal conductivity as well as its high critical current density. Being able to predict these phenomena, can guide and optimize MgB2-based devices for magnetic flux shielding or trapping applications. In this work, the flux-jump occurrence in an MgB2 cup-shaped shield is numerically studied using the finite element method by means of the commercial software COMSOL 6.0 Multiphysics®. To this aim, we developed a 2D axial-symmetric model coupling the heat diffusion equation and the magnetic equations based on a magnetic vector-potential A-formulation. The comparison of the computed shielding curves with the experimental ones evidenced a good agreement between the two sets of data at different temperatures and positions along the shield's axis. The as-validated model was then exploited to investigate possible optimization routes via the improvement of both the thermal conductivity of the material and the thermal exchange between the device and the cooling stage.

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Impact of rare earth oxides metal (Dy, Tb, Er, Eu, Sm) admixtures on the structure, morphology, pinning centers and critical parameters of MgB2 materials manufactured by ambient pressure sintering and hot isostatic pressure processes

Gajda,

Filar,

Morawski

et al. 2023

Ceramics International

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Novel ultra-sonic boron refinement in distilled water for cost-efficient fabrication of MgB2 bulk ceramic superconductors

Cited by 7 publications

References 43 publications

Review on high-performance bulk MgB₂ superconductors

Review on high-performance bulk MgB₂ superconductors

Numerical study on flux-jump occurrence in a cup-shaped MgB₂ bulk for magnetic shielding applications

Impact of rare earth oxides metal (Dy, Tb, Er, Eu, Sm) admixtures on the structure, morphology, pinning centers and critical parameters of MgB2 materials manufactured by ambient pressure sintering and hot isostatic pressure processes

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Novel ultra-sonic boron refinement in distilled water for cost-efficient fabrication of MgB2 bulk ceramic superconductors

Cited by 7 publications

References 43 publications

Review on high-performance bulk MgB2 superconductors

Review on high-performance bulk MgB2 superconductors

Numerical study on flux-jump occurrence in a cup-shaped MgB2 bulk for magnetic shielding applications

Impact of rare earth oxides metal (Dy, Tb, Er, Eu, Sm) admixtures on the structure, morphology, pinning centers and critical parameters of MgB2 materials manufactured by ambient pressure sintering and hot isostatic pressure processes

Contact Info

Product

Resources

About

Review on high-performance bulk MgB₂ superconductors

Review on high-performance bulk MgB₂ superconductors

Numerical study on flux-jump occurrence in a cup-shaped MgB₂ bulk for magnetic shielding applications