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dc.contributor.authorSafarian, Jafar
dc.contributor.authorEngh, Thorvald Abel
dc.date.accessioned2017-11-20T08:08:26Z
dc.date.available2017-11-20T08:08:26Z
dc.date.created2012-11-01T09:47:46Z
dc.date.issued2013
dc.identifier.citationMetallurgical and Materials Transactions. A. 2013, 44A (2), 747-753.nb_NO
dc.identifier.issn1073-5623
dc.identifier.urihttp://hdl.handle.net/11250/2467047
dc.description.abstractTheories on the evaporation of pure substances are reviewed and applied to study vacuum evaporation of pure metals. It is shown that there is good agreement between different theories for weak evaporation, whereas there are differences under intensive evaporation conditions. For weak evaporation, the evaporation coefficient in Hertz-Knudsen equation is 1.66. Vapor velocity as a function of the pressure is calculated applying several theories. If a condensing surface is less than one collision length from the evaporating surface, the Hertz-Knudsen equation applies. For a case where the condensing surface is not close to the evaporating surface, a pressure criterion for intensive evaporation is introduced, called the effective vacuum pressure, peff. It is a fraction of the vapor pressure of the pure metal. The vacuum evaporation rate should not be affected by pressure changes below peff, so that in lower pressures below peff, the evaporation flux is constant and equal to a fraction of the maximum evaporation flux given by Hertz-Knudsen equation as 0.844 n˙Maxn˙Max . Experimental data on the evaporation of liquid and solid metals are included.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringer Verlagnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleVacuum evaporation of pure metalsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber747-753nb_NO
dc.source.volume44Anb_NO
dc.source.journalMetallurgical and Materials Transactions. Anb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.1007/s11661-012-1464-2
dc.identifier.cristin958912
dc.description.localcode© The Author(s) 2012. This article is published with open access at Springerlink.com.nb_NO
cristin.unitcode194,66,35,0
cristin.unitnameInstitutt for materialteknologi
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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