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

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Low Temperature Dielectric Strength of Polyimide-Silica Nanocomposites for Applications in High-Temperature Superconducting Cables./
作者:	McCaffrey, Michael John.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	113 p.
附註:	Source: Masters Abstracts International, Volume: 84-04.
Contained By:	Masters Abstracts International84-04.
標題:	Electrical engineering. -
電子資源:	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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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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