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, Haigun Lee

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)97-104
Number of pages8
JournalCryogenics
Volume100
DOIs
Publication statusPublished - 2019 Jun 1

Fingerprint

Carbon Nanotubes
fillers
Magnets
Fillers
Carbon nanotubes
thermal stability
magnets
carbon nanotubes
Acids
composite materials
Composite materials
acids
coils
Superconducting tapes
Cooling
Epoxy Resins
Liquid nitrogen
Carboxylic Acids
Carboxylic acids
Heat conduction

Keywords

  • Acid-treated CNT
  • Electrical properties
  • Epoxy

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers. / Kim, J. C.; Son, H. H.; Choi, Y. H.; Kim, Y. G.; Kim, J. M.; Choi, Y. S.; Lee, Haigun.

In: Cryogenics, Vol. 100, 01.06.2019, p. 97-104.

Research output: Contribution to journalArticle

Kim, J. C. ; Son, H. H. ; Choi, Y. H. ; Kim, Y. G. ; Kim, J. M. ; Choi, Y. S. ; Lee, Haigun. / Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers. In: Cryogenics. 2019 ; Vol. 100. pp. 97-104.
@article{86f0246a21e64e0dba8855c7d2f7423f,
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 Haigun Lee",
year = "2019",
month = "6",
day = "1",
doi = "10.1016/j.cryogenics.2019.04.011",
language = "English",
volume = "100",
pages = "97--104",
journal = "Cryogenics",
issn = "0011-2275",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Thermal and electrical stabilities of GdBCO magnets impregnated with epoxy composites using surface-treated carbon nanotube fillers

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, Haigun

PY - 2019/6/1

Y1 - 2019/6/1

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

UR - http://www.scopus.com/inward/record.url?scp=85065232919&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065232919&partnerID=8YFLogxK

U2 - 10.1016/j.cryogenics.2019.04.011

DO - 10.1016/j.cryogenics.2019.04.011

M3 - Article

VL - 100

SP - 97

EP - 104

JO - Cryogenics

JF - Cryogenics

SN - 0011-2275

ER -