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Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables./
Author:	McCaffrey, Michael John.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	113 p.
Notes:	Source: Masters Abstracts International, Volume: 84-04.
Contained By:	Masters Abstracts International84-04.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29212320
ISBN:	9798351477602

Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables.
McCaffrey, Michael John.

Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 113 p.

Source: Masters Abstracts International, Volume: 84-04.

Thesis (M.S.)--Rowan University, 2022.

This item must not be sold to any third party vendors.

Gaseous helium is often considered as an alternative to liquid nitrogen to cool modern high-temperature superconducting cables in support of increased power capacity and/or reduction of required cable size. However, the small size of helium molecules and relatively poor dielectric strength of helium gas create challenges which limit the usefulness of modern cable dielectrics. Continuous dielectric coatings have been considered as an alternative to traditional lapped tape dielectrics to support gaseous helium refrigerants, but unmatched thermal contraction between the coating and cable components would induce failures due to mechanical stress. Composite materials have been considered as a means of matching rates of thermal expansion to that of superconducting cables while retaining excellent withstanding against strong electric fields. Polyimide/silicon dioxide nanocomposites are a promising candidate for this application and are examined as such in this work. Nanocomposite films of various filler concentrations up to 7% were produced and tested for their dielectric strength at both room temperature and approximately 90 K. Despite a slight reduction in dielectric strength with increased nanoparticle concentrations at room temperature, the results suggest that polyimide provides ample dielectric strength as a composite matrix in superconducting cable dielectrics.

ISBN: 9798351477602Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Gaseous helium

Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables.
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245 1 0 $a Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables.
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300 $a 113 p.
500 $a Source: Masters Abstracts International, Volume: 84-04.
500 $a Advisor: Krchnavek, Robert.
502 $a Thesis (M.S.)--Rowan University, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a Gaseous helium is often considered as an alternative to liquid nitrogen to cool modern high-temperature superconducting cables in support of increased power capacity and/or reduction of required cable size. However, the small size of helium molecules and relatively poor dielectric strength of helium gas create challenges which limit the usefulness of modern cable dielectrics. Continuous dielectric coatings have been considered as an alternative to traditional lapped tape dielectrics to support gaseous helium refrigerants, but unmatched thermal contraction between the coating and cable components would induce failures due to mechanical stress. Composite materials have been considered as a means of matching rates of thermal expansion to that of superconducting cables while retaining excellent withstanding against strong electric fields. Polyimide/silicon dioxide nanocomposites are a promising candidate for this application and are examined as such in this work. Nanocomposite films of various filler concentrations up to 7% were produced and tested for their dielectric strength at both room temperature and approximately 90 K. Despite a slight reduction in dielectric strength with increased nanoparticle concentrations at room temperature, the results suggest that polyimide provides ample dielectric strength as a composite matrix in superconducting cable dielectrics.
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650 4 $a Electrical engineering. $3 596380
650 4 $a Nanotechnology. $3 557660
653 $a Gaseous helium
653 $a Superconductors
653 $a Dielectric coatings
653 $a Nanocomposites
690 $a 0544
690 $a 0652
710 2 $a Rowan University. $b Electrical and Computer Engineering. $3 1194155
773 0 $t Masters Abstracts International $g 84-04.
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792 $a 2022
793 $a English
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