A generic process to introduce nanoparticles into powder preforms and its application to Infiltration Growth processing of REBa2Cu3O7 superconductor

Raju, P. Missak Swarup; Seshubai, V.; Rajasekharan, T.

doi:10.1016/j.matchemphys.2015.05.004

Cited by 10 publications

(6 citation statements)

References 32 publications

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“…To refine the RE-211 particles in the final products, many methods such as the addition of grain refiners (Pt, CeO 2 , Ba–Ce–O, etc.) have been tried. − However, these additives are economically costly and with chemical addition, there always exist problems in maintaining the chemical composition throughout the bulk, and the achieved homogeneity is questionable. Ball milling is also limited to produce particles with ∼100 nm size, but milling for several hours results in the introduction of impurities, which is not desirable.…”

Section: Introductionmentioning

confidence: 99%

Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

et al. 2020

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Growth and physical properties of bulk REBa2Cu3O7−δ (REBCO) superconductors fabricated by the infiltration growth (IG) method strongly depend on the initial size and morphology of the RE2BaCuO5 (211) particles. The present work details the novel method we developed for producing sharp-edged and surface-damaged 211 particles to be added to the REBCO bulks. We employed high-energy ultrasonic irradiation for pretreating the 211 particles and fabricated high-performance bulk single-grain YBa2Cu3O7−δ (YBCO) superconductors via the top-seeded IG process. Increasing the ultrasound irradiation power and time duration mechanically damaged the surface of the 211 particles, producing more fine and sharp edges. Systematic investigations of the microstructural properties of the final YBCO bulks indicated that the size and content of the 211 particles gradually decreased without any additional chemical doping. The effective grain refinement and improved interfacial defect densities enhanced the critical current density by a factor of two at 77 K and self-field as compared to a YBCO sample fabricated without any pretreatment. A maximum trapped field of 0.48 T at 77 K was obtained for a sample (20 mm diameter) with 211 particles treated for 60 min and 300 W ultrasound radiation. The effectiveness of the novel method is demonstrated by the superior performance of the YBCO bulk samples prepared as compared to bulk samples fabricated with the addition of Pt and CeO2. This method is novel, cost effective, and very convenient, maintaining high sample homogeneity, and is free of chemical contaminants as compared to other methods which significantly affect the properties of all REBCO bulk products grown by sintering, melt growth, and IG methods.

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Section: Introductionmentioning

confidence: 99%

Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

et al. 2020

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“…In previous work published in the literature, which meets the requirement of shaping and light weight, woven Y 2 O 3 cloths were employed as a base material, and the superconductor was formed by an infiltration growth process [4]. In the last years, this process has also been beneficial for bulk superconductors [5,6]. Superconducting fabrics of about 100 μm thickness could be prepared using YBa 2 Cu 3 O x (YBCO) as superconducting material [7,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Zeng

Karwoth

Koblischka

et al. 2017

Phys. Rev. Materials

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Networks of superconducting Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires have a diameter of the order of 150-200 nm and lengths up to the micrometer range and form a nonwoven, fabric-like network with numerous interconnections enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetizations of the nanowire networks [M(T ) and M(H )] were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). It is supposed that the averaged diameter of the nanowires rules the magnetic field dependence of the critical current density of the nanowire network. Single nanowires have remarkably high values of the critical current density of 1.04 × 10 7 A/cm 2 at 5 K. The macroscopic critical current density less than ∼0.05 A/cm

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“…A sol-casting method was employed, for uniform distribution of ZrO2 nano particles to the ground powder. This method is discussed elsewhere [26] in detail. The resultant gel was dried, debindered, and ground to obtain them in powder form.…”

Section: Methodsmentioning

confidence: 99%

“…Nano ZrO2 was then added to mixed powders of Bi 2223 and 20 mol. % of Ca0.86Sr0.14CuO2, using a sol-casting method [26] that enables uniform distribution of particles without agglomeration and is different from adding it directly to the precursor powders of the Bi 2223.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano ZrO₂ addition on the properties of Ca_0.86Sr_0.14CuO₂ added Bi 2223 composites

Verma

Rajasekharan

Das

et al. 2023

J. Phys.: Conf. Ser.

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Effect of introducing nano ZrO2 particles into (Ca,Sr)CuO2 added Bi 2223 superconductor composites is studied. Microstructures revealed that 20 mol. % (Ca,Sr)CuO2 phase added to Bi 2223 formed as micron sized particles among the Bi 2223 platelet shaped grains. Distribution of (Ca,Sr)CuO2 in Bi 2223 has enhanced the critical current density (Jc) and flux pinning force density (Fp ) substantially to fields up to 9 T at 20 K. Introduction of nano ZrO2 into the composite reacted with (Ca,Sr)CuO2 particles and formed additional secondary phases of increasing amount with a rise in ZrO2 content. This resulted in lowering of Jc(0) due to a gradual reduction in the fraction of superconducting phases, but retained the enhanced field range in which flux pinning was achieved. At 10 wt.% addition of ZrO2, Bi 2223 phase was suppressed, and Bi 2212 phase was promoted. Scaling behaviour of pinning force density has shown the dominant mechanism at low fields to be normal surface pinning due to interfacial defects. The fact that (Ca,Sr)CuO2 distributes itself as fine spherical particles in Bi 2223, without causing degradation of the superconducting matrix material, is of significance and opens up a scope to optimize the microstructures further for enhancement of flux pinning.

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A generic process to introduce nanoparticles into powder preforms and its application to Infiltration Growth processing of REBa2Cu3O7 superconductor

Cited by 10 publications

References 32 publications

Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Effect of nano ZrO₂ addition on the properties of Ca_0.86Sr_0.14CuO₂ added Bi 2223 composites

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A generic process to introduce nanoparticles into powder preforms and its application to Infiltration Growth processing of REBa2Cu3O7 superconductor

Cited by 10 publications

References 32 publications

Production of Sharp-Edged and Surface-Damaged Y2BaCuO5 by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa2Cu3O7−δ Bulk Superconductors

Production of Sharp-Edged and Surface-Damaged Y2BaCuO5 by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa2Cu3O7−δ Bulk Superconductors

Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Effect of nano ZrO2 addition on the properties of Ca0.86Sr0.14CuO2 added Bi 2223 composites

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Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

Production of Sharp-Edged and Surface-Damaged Y₂BaCuO₅ by Ultrasound: Significant Improvement of Superconducting Performance of Infiltration Growth-Processed YBa₂Cu₃O_7−δ Bulk Superconductors

Effect of nano ZrO₂ addition on the properties of Ca_0.86Sr_0.14CuO₂ added Bi 2223 composites