Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers

J. C. Kim; H. H. Son; Y. H. Choi; Y. G. Kim; J. M. Kim; Y. S. Choi; H. G. Lee

doi:10.1016/j.cryogenics.2019.04.011

Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers

J. C. Kim, H. H. Son, Y. H. Choi, Y. G. Kim, J. M. Kim, Y. S. Choi, H. G. Lee

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

This study investigates the thermal and electrical stabilities of superconducting coils encapsulated with an epoxy/acid-treated carbon nanotube (CNT)composite through cool-down, over-current, and repetitive-cooling tests. Carboxylic acid groups were successfully attached to CNT surfaces by acid treatment, which facilitated uniform CNT dispersion within the epoxy resin, forming preferential paths for heat conduction. The coil encapsulated with the epoxy/acid-treated CNT composite showed a fast cooling rate in a bath of liquid nitrogen (LN2)and high endurance under over-current conditions. This contrasts with its counterpart encapsulated with untreated CNTs, because heat was easily dissipated in the epoxy/acid-treated CNT composite owing to its higher thermal conductivity. Moreover, the difference in the thermal expansion coefficients of the epoxy and the superconducting tape decreased. Therefore, using an epoxy composite containing acid-treated CNTs is recommended for developing a mechanically dense superconducting coil with enhanced thermal and electrical stabilities.

Original language	English
Pages (from-to)	97-104
Number of pages	8
Journal	Cryogenics
Volume	100
DOIs	https://doi.org/10.1016/j.cryogenics.2019.04.011
Publication status	Published - 2019 Jun

Bibliographical note

Funding Information:
This work was supported by the Korea Basic Science Institute under Grant D39614 .

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Acid-treated CNT
Electrical properties
Epoxy

ASJC Scopus subject areas

General Materials Science
General Physics and Astronomy

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10.1016/j.cryogenics.2019.04.011

Cite this

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title = "Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers",

abstract = "This study investigates the thermal and electrical stabilities of superconducting coils encapsulated with an epoxy/acid-treated carbon nanotube (CNT)composite through cool-down, over-current, and repetitive-cooling tests. Carboxylic acid groups were successfully attached to CNT surfaces by acid treatment, which facilitated uniform CNT dispersion within the epoxy resin, forming preferential paths for heat conduction. The coil encapsulated with the epoxy/acid-treated CNT composite showed a fast cooling rate in a bath of liquid nitrogen (LN2)and high endurance under over-current conditions. This contrasts with its counterpart encapsulated with untreated CNTs, because heat was easily dissipated in the epoxy/acid-treated CNT composite owing to its higher thermal conductivity. Moreover, the difference in the thermal expansion coefficients of the epoxy and the superconducting tape decreased. Therefore, using an epoxy composite containing acid-treated CNTs is recommended for developing a mechanically dense superconducting coil with enhanced thermal and electrical stabilities.",

keywords = "Acid-treated CNT, Electrical properties, Epoxy",

author = "Kim, {J. C.} and Son, {H. H.} and Choi, {Y. H.} and Kim, {Y. G.} and Kim, {J. M.} and Choi, {Y. S.} and Lee, {H. G.}",

note = "Funding Information: This work was supported by the Korea Basic Science Institute under Grant D39614 . Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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AU - Kim, J. C.

AU - Son, H. H.

AU - Choi, Y. H.

AU - Kim, Y. G.

AU - Kim, J. M.

AU - Choi, Y. S.

AU - Lee, H. G.

PY - 2019/6

Y1 - 2019/6

N2 - This study investigates the thermal and electrical stabilities of superconducting coils encapsulated with an epoxy/acid-treated carbon nanotube (CNT)composite through cool-down, over-current, and repetitive-cooling tests. Carboxylic acid groups were successfully attached to CNT surfaces by acid treatment, which facilitated uniform CNT dispersion within the epoxy resin, forming preferential paths for heat conduction. The coil encapsulated with the epoxy/acid-treated CNT composite showed a fast cooling rate in a bath of liquid nitrogen (LN2)and high endurance under over-current conditions. This contrasts with its counterpart encapsulated with untreated CNTs, because heat was easily dissipated in the epoxy/acid-treated CNT composite owing to its higher thermal conductivity. Moreover, the difference in the thermal expansion coefficients of the epoxy and the superconducting tape decreased. Therefore, using an epoxy composite containing acid-treated CNTs is recommended for developing a mechanically dense superconducting coil with enhanced thermal and electrical stabilities.

AB - This study investigates the thermal and electrical stabilities of superconducting coils encapsulated with an epoxy/acid-treated carbon nanotube (CNT)composite through cool-down, over-current, and repetitive-cooling tests. Carboxylic acid groups were successfully attached to CNT surfaces by acid treatment, which facilitated uniform CNT dispersion within the epoxy resin, forming preferential paths for heat conduction. The coil encapsulated with the epoxy/acid-treated CNT composite showed a fast cooling rate in a bath of liquid nitrogen (LN2)and high endurance under over-current conditions. This contrasts with its counterpart encapsulated with untreated CNTs, because heat was easily dissipated in the epoxy/acid-treated CNT composite owing to its higher thermal conductivity. Moreover, the difference in the thermal expansion coefficients of the epoxy and the superconducting tape decreased. Therefore, using an epoxy composite containing acid-treated CNTs is recommended for developing a mechanically dense superconducting coil with enhanced thermal and electrical stabilities.

KW - Acid-treated CNT

KW - Electrical properties

KW - Epoxy

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JF - Cryogenics

ER -

Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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