Development and Characterization of Cu–Nb–MgB2 and CuNi–Nb–MgB2 Wires With VB2 and Carbon Nanotube Additions

Rodrigues, Durval; Antunes, Luiz Henrique Martinez; Manesco, Antonio L. R.; Moraes, Eduardo M.; Silva, L B S Da

doi:10.1109/tasc.2014.2387698

Cited by 4 publications

(3 citation statements)

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“…O MgB 2 apresenta comportamento granular e o estudo das suas propriedades e características supercondutoras são devidas ao comportamento de aprisionamento do fluxo magnético. Temse utilizado metodologias de dopagem da fase supercondutora com elementos ou compostos que alterem as propriedades físicas e supercondutoras da matriz, por exemplo: irradiação de prótons (BUGOSLAVSKY et al, 2001), dopagem (YEOH; DOU, 2007) e por MAE (DA SILVA; HELLSTROM; RODRIGUES Jr., 2015;RODRIGUES Jr. et al, 2008;SENKOWICZ et al, 2005;GÜMBEL et al, 2002 Nos supercondutores do tipo II, forma-se uma rede quântica de vórtices, como podemos observar na Figura 5, através das quais fluem a corrente transportada e cujo movimento deve ser evitado por meio de aprisionamento da rede de vórtices. A movimentação dos fluxóides gera calor ocorrendo o aumento da temperatura, o material tenderá a sair do estado supercondutor em que se encontra.…”

Section: Supercondutividade No Mgbunclassified

“…Um aumento excessivo na moagem causa degradação das propriedades supercondutoras (GOLDACKER et al, 2004). Como (RODRIGUES Jr. et al, 2015) Figura 24 -Distribuição do tamanho das partículas…”

Section: Efeito Do Tamanho Inicial Das Partículasunclassified

“…Uma metodologia para a mistura homogênea de compostos que pode ser utilizada na análise de dopagem de materiais supercondutores é a MAE (HEBM -High-Energy Ball Milling) (DA SILVA; HELLSTROM; RODRIGUES Jr., 2014; RODRIGUES Jr. et al, 2012). Técnicas de MAE têm sido utilizadas para a preparação de diversos compostos intermetálicos e supercondutores (SENKOWICZ et al, 2005) e pela equipe de Rodrigues et al(2015Rodrigues et al( ,2012Rodrigues et al( ,2009Rodrigues et al( ,2008.…”

Section: Variáveis Do Processo De Moagemunclassified

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Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB2

Ribeiro¹

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The discovery of superconductivity in magnesium diboride (MgB 2) in 2001 with critical temperatute (T c) of 39 K and upper critical magnetic field (H c2) (H ⊥ c2 (0)) ∼ 40 (T), caused a frenetic search for lightweight materials with similar crystalline structures and constituded by simple elements, and with potential to replace the already traditional Nb-Ti and Nb 3 Sn in the manufacturing of superconducting wires and tapes. However, despite the MgB 2 has high T c , the H c2 values decay rapidly when an external magnetic field is applied, mainly due to the poor pinning of the magnetic flux lines in the material. Furthermore, the plastic deformation process of the set containing the granular powder, constituded of metals used as diffusion barrier thermal and electric stabilizer, is a challenge, because the hardening of the metals by cold working and the accommodation of the superconducting powder. The objective of this work is to develop a process for the manufacture of multifilamentary MgB 2 wires, doped with carbon in the form of graphite and addition of diborides with crystalline structure similar to MgB 2 , as well as the optimization of the mechanical deformation processes, of the intermediate heat treatments and the characterization of the crystallographic, microstructural and superconducting properties of the wire. The methodology used for the production of the wire was the Powder-In-Tube (PIT) ex-situ with: milling of the powder in a high energy ball mill, chemical doping with graphite, addition of vanadium diboride (VB 2), magnesium in excess and use of stearic acid (C 18 H 36 O 2) as a process controlling agent. The mechanical deformation was done by means of rotary swaging. The final results suggest that the route used for the fabrication process of the graphite-doped MgB 2 multifilamentary wire with introduction of VB 2 , should be changed to use MgB 2 produced in laboratory from pure magnesium and boron, with a certificate of purity, using the in-situ methodology in a glove-box with controlled and monitored atmosphere with respect to the oxygen and humidity contents. The process described in this work improves methodologies shown in literature and guarantees the integrity of the wire during the entire fabrication process. In addition, it is suggested the use of an external reinforcing material, such as: iron, Glidcop (Cu-Al 15) or stainless steel (SUS 316L), so that the wire has a higher mechanical tensile strength and a lower cost.

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Section: Supercondutividade No Mgbunclassified

Section: Efeito Do Tamanho Inicial Das Partículasunclassified

Section: Variáveis Do Processo De Moagemunclassified

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Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB2

Ribeiro¹

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Evaluation of superconducting features and gap coefficients for electron–phonon couplings properties of MgB2 with multi-walled carbon nanotube addition

Kaya

Çavdar

Öztürk

et al. 2022

J Mater Sci: Mater Electron

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Nb sheathed MgB₂ superconducting tape with addition of VB₂

Silva

Andreotti

Rodrigues

2020

J. Phys.: Conf. Ser.

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MgB2 superconductor is a strategic material for practical applications, due to its superconducting properties as well as the low cost of the raw materials. For many technological applications cable, wire or tape format are required. The addition of VB2 in the MgB2 superconducting bulk had already been used in previous works as an efficient method to enhance the critical current density of the MgB2. In the present work, MgB2 superconducting tapes were developed and characterized using different amount of VB2 addition. Niobium was used as sheath material. The goal of this work is to create an efficient method to improve the transport properties of MgB2 superconducting tapes to be useful for practical application. The results include microstructural, crystallographic, magnetic and transport characterizations. All analyzes were performed together to study the influence of the VB2 addition on the superconducting behavior of MgB2 tapes.

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Development and Characterization of Cu–Nb–MgB₂ and CuNi–Nb–MgB₂ Wires With VB₂ and Carbon Nanotube Additions

Cited by 4 publications

References 20 publications

Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB<sub>2</sub>

Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB<sub>2</sub>

Evaluation of superconducting features and gap coefficients for electron–phonon couplings properties of MgB2 with multi-walled carbon nanotube addition

Nb sheathed MgB₂ superconducting tape with addition of VB₂

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Development and Characterization of Cu–Nb–MgB2 and CuNi–Nb–MgB2 Wires With VB2 and Carbon Nanotube Additions

Cited by 4 publications

References 20 publications

Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB<sub>2</sub>

Desenvolvimento da metodologia de fabricação de um fio supercondutor de MgB<sub>2</sub>

Evaluation of superconducting features and gap coefficients for electron–phonon couplings properties of MgB2 with multi-walled carbon nanotube addition

Nb sheathed MgB2 superconducting tape with addition of VB2

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Product

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Development and Characterization of Cu–Nb–MgB₂ and CuNi–Nb–MgB₂ Wires With VB₂ and Carbon Nanotube Additions

Nb sheathed MgB₂ superconducting tape with addition of VB₂