Large shaped parts of melt cast BSCCO for applications in electrical engineering

Böck, J.; Bestgen, H.; Elschner, S.; Preisler, E.

doi:10.1109/77.233913

Cited by 56 publications

(19 citation statements)

References 4 publications

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“…The optimization of the bulk material is to a certain degree the results of adding the SrS04 admixture [2]. In this process fine crystallites are evenly distributed in the MCP material leading to an enhanced microstructure with higher critical currents [4], better mechanical stability and simultaneously having a lower thermal conductivity, which is especially beneficial for the current lead application.…”

Section: Test Sample Fabricationmentioning

confidence: 99%

“…The superconductor, a cylindrical rod of BSCCO-2212 fabricated by a melt cast process, has an initial J, (B=O) of 970 A/cm2 at 77 K and a total contact joint resistance for both terminals of 2 pR in the current Fig. 1 BSCCO-2212 bulk parts were manufactured via the Melt Casting Process (MCP) which offers an easy access to samples of different shapes and sizes [2]. The process starts with a downmelting of a homogeneous mixture of the binary metal oxides together with SrS04 as admixture.…”

Section: Test Sample Fabricationmentioning

confidence: 99%

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Current cycling test on HTSC for Westinghouse current leads

Selvaggi

Böck³

1995

IEEE Trans. Appl. Supercond.

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Absrrucz -To evaluate the reliability of high temperature superconducting current leads for repetitive current ramping operations such as in a magnetic separator, a ceramic high temperature superconductor with its copper terminals was subjected to current cycling tests in liquid nitrogen. The superconductor, a cylindrical rod of BSCCO-2212 fabricated by a melt cast process, has an initial J, (B=O) of 970 A/cm2 at 77 K and a total contact joint resistance for both terminals of 2 pR in the current range of 100 to 500 A. Due to power supply limitation, the cycling current magnitude was set at 50 A. The cycling rate was 1 cycle per minute, 30 seconds on 30 seconds off. After approximately 80,000 cycles and 250,000 cycles, measurements of J, and contact joint resistance were repeated. No degradation in either J, or contact joint resistance was detected. The testing and the test results are discussed in detail.

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Section: Test Sample Fabricationmentioning

confidence: 99%

Section: Test Sample Fabricationmentioning

confidence: 99%

Current cycling test on HTSC for Westinghouse current leads

Selvaggi

Böck³

1995

IEEE Trans. Appl. Supercond.

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“…It was reported that the addition of to 2212 had beneficial effects on the critical current and machinability [2]- [4]. To this end, the casting process has been widely used to obtain composite superconductors with complex shapes and large sizes with a high critical current [2]. Manuscript The casting process includes powder mixing, melting, casting, solidification, and heat treatment, and the critical properties of are affected by these processing conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Bi-2212 (2212) is one of the most promising materials for these applications on account of its high critical temperature , wide temperature range in which the superconducting phase forms, and reversible phase formability during melting and solidification [1]. It was reported that the addition of to 2212 had beneficial effects on the critical current and machinability [2]- [4]. To this end, the casting process has been widely used to obtain composite superconductors with complex shapes and large sizes with a high critical current [2].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Processing Variables of the BSCCO-2212 Bulk Superconductors

Kim

Lim

Jang

et al. 2007

IEEE Trans. Appl. Supercond.

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Bi 2212 SrSO 4 bulk superconductors were fabricated using a casting process, and the effects of the powder mixing method, annealing temperature, and SrSO 4 content on the texture, microstructure, and critical properties were evaluated. The Bi-2212 powders were mixed with SrSO 4 either by hand-mixing (HM) or planetary ball milling (PBM), followed by melting at 1100 C-1200 C, solidification, and annealing. The rod produced by PBM had a more homogeneous microstructure and smaller grain size of SrSO 4 and minor phases, resulting in increased I c , than the rod made by HM. The I c of the rod was also dependent on the annealing temperature with the highest I c of 200 A being obtained at an annealing temperature of 810 C. This was attributed to the moderate density and 2212texture as well as the smaller and less minor phase than that observed at higher temperature. In addition, the optimum SrSO 4 content was found to be 6 wt.% for an increased I c . SEM, EPMA, and DTA analyses indicated that the differences in microstructural evolution caused the variations of the I c with the powder mixing method, annealing temperature, and SrSO 4 addition.

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“…In the equivalent circuit of CLD, only resistance of the secondary SC coil R is non-linear. The dependence of the HTSC resistivity on current density and temperature is modeled as an approximation of experimental data [6,7]. The resistivity equals zero below the critical current and critical temperature.…”

Section: Mathematical Model Of Sc Cldmentioning

confidence: 99%

Superconducting inductive current limiter as a power system component

Meerovich

Sokolovsky

Jung

et al.

Eighteenth Convention of Electrical and Electronics Engineers in Israel

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One promising option for the current limiter is a device based on a fast transition of a superconducting material from the superconducting state with zero resistance to the normal state with pronounced resistance. The superconducting current limiting device being developed by us is based on an idea of inductive coupling of an active high critical temperature superconducting element to the power network We present the results of theoretical investigation of the device's influence on the electromagnetic processes in the circuit to be protected. We have performed a simulation of a 13.8 kV device performance with the use of a mathematical model that takes into account both, electromagnetic and thermal processes in the device. We have introduced the inhomogenities of the ring properties into the model and investigated their influence on the transient characteristics of the device. The basic properties of the current limiter were e x p e r h " J I y investigated using 5 0 V / l U~ and 1000V125A prototypes.

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Large shaped parts of melt cast BSCCO for applications in electrical engineering

Cited by 56 publications

References 4 publications

Current cycling test on HTSC for Westinghouse current leads

Current cycling test on HTSC for Westinghouse current leads

A Study on the Processing Variables of the BSCCO-2212 Bulk Superconductors

Superconducting inductive current limiter as a power system component

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