ISSN 2594-5327
59º Congresso anual — Vol. 59 , num. 1 (2004)
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The Fault Current Limiter (FCL) should be one of the first high-temperature superconducting devices to arrive at the market. The FCL’s can be improved by using bulk superconductors with high critical currents, which requires a sufficiently dense and textured material. The Bi₂Sr₂Ca₂Cu₃O₁₀₊ₓ (Bi-2223) is one of the main high temperature superconductors for applications. In the present work, a process for improving the microstructure of Bi-2223 blocks is investigated. Pressed precursor blocks are sintered with a partial melting step to enhancing the Bi-2223 grain texture and to healing cracks induced by pressing. In order to improve the microstructure, the precursor is mixed with silver powder before pressing. Samples with and without silver powder have been studied, with the aim of investigating the influence of silver on the microstructure evolution. The phase contents and the microstructure obtained have been analyzed through XRD and SEM/EDS; the electromagnetic characterization has been performed by Magnetic Susceptibility Analysis. We present and discuss the process and the properties of the superconducting blocks. High fractions of textured Bi-2223 grains have been obtained.
The Fault Current Limiter (FCL) should be one of the first high-temperature superconducting devices to arrive at the market. The FCL’s can be improved by using bulk superconductors with high critical currents, which requires a sufficiently dense and textured material. The Bi₂Sr₂Ca₂Cu₃O₁₀₊ₓ (Bi-2223) is one of the main high temperature superconductors for applications. In the present work, a process for improving the microstructure of Bi-2223 blocks is investigated. Pressed precursor blocks are sintered with a partial melting step to enhancing the Bi-2223 grain texture and to healing cracks induced by pressing. In order to improve the microstructure, the precursor is mixed with silver powder before pressing. Samples with and without silver powder have been studied, with the aim of investigating the influence of silver on the microstructure evolution. The phase contents and the microstructure obtained have been analyzed through XRD and SEM/EDS; the electromagnetic characterization has been performed by Magnetic Susceptibility Analysis. We present and discuss the process and the properties of the superconducting blocks. High fractions of textured Bi-2223 grains have been obtained.
Palavras-chave
high temperature superconductor, Bi-2223, fault current limiter (FCL)
high temperature superconductor, Bi-2223, fault current limiter (FCL)
Como citar
Polasek, Alexander; Saléh, Luiz Antonio; Borges, Hortêncio Alves; Marinkovic, Bojan; Rizzo, Fernando; Serra, Eduardo Torres; Oliveira, Glória Suzana de.
PRODUCTION OF HIGH-TEMPERATURE SUPERCONDUCTORS FOR FAULT CURRENT LIMITERS,
p. 2621-2628.
In: 59º Congresso anual,
São Paulo, Brasil,
2004.
ISSN: 2594-5327, DOI 10.5151/2594-5327-4034
