Publication:
Studying the porosity of graphite foil with different densities: pore space model and gas permeability

Дата
2022
Авторы
Yurkov, A. L.
Malakho, A. P.
Ivanov, A. V.
Chernova, E. A.
Belogorlov, A. A.
Avdeev, V. V.
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Научные группы
Организационные подразделения
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Институт нанотехнологий в электронике, спинтронике и фотонике
Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе. ​Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.​
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Аннотация
The study is aimed to deepen the understanding of the interrelation between density, open and closed porosity as well as gas permeability of compressed graphite foils with a density ranging from 0.5 to 1.8 g·cm−3 designed especially for sealing applications. The pore structure of the graphite foil samples is experimentally measured by several complementary methods: low-temperature N2 adsorption, method of saturation with liquids (hydrostatic weighting), mercury porosimetry, and helium leak detection for gas permeability measurement. A comparative study of the porosity obtained by mercury porosimetry and by saturation with water and isopropanol, made it possible to propose a reliable express method for determining and controlling the porosity of dense graphite foil. It was found that the characteristic pore size and open porosity of graphite foil decreases with increasing its density from 0.5 to 1.8 g·cm−3 leading to a decrease in helium gas permeability of the foils. An average capillary diameter, the number of capillaries and their effective cross-sectional area was calculated on the basis of the dependence of helium gas permeability on foil density and gas pressure. The obtained data were applied for describing the pore structure of the graphite foils with low density and explanation of their low gas permeability. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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Studying the porosity of graphite foil with different densities: pore space model and gas permeability / Yurkov, A.L. [et al.] // Journal of Materials Science. - 2022. - 10.1007/s10853-022-07677-9
URI
https://www.doi.org/10.1007/s10853-022-07677-9
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85142265150&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000886443900002
 https://openrepository.mephi.ru/handle/123456789/27673
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