Influence of pressure on the electrical conductivity of metal powders used as fillers in polymer composites

Mamunya, YeP; Zois, H; Apekis, L; Lebedev, EV

dc.contributor.author	Mamunya, YeP	en
dc.contributor.author	Zois, H	en
dc.contributor.author	Apekis, L	en
dc.contributor.author	Lebedev, EV	en
dc.date.accessioned	2014-03-01T01:20:38Z
dc.date.available	2014-03-01T01:20:38Z
dc.date.issued	2004	en
dc.identifier.issn	0032-5910	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15996
dc.subject	Electrical conductivity	en
dc.subject	Metal powders	en
dc.subject	Packing factor	en
dc.subject	Particle size	en
dc.subject	Polymer composites	en
dc.subject	Pressure	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Composite materials	en
dc.subject.other	Copper	en
dc.subject.other	Electric conductivity	en
dc.subject.other	Fillers	en
dc.subject.other	Hardness	en
dc.subject.other	Oxidation	en
dc.subject.other	Pressure effects	en
dc.subject.other	Oxidized layers	en
dc.subject.other	Powder metals	en
dc.subject.other	copper	en
dc.subject.other	epoxy resin	en
dc.subject.other	iron	en
dc.subject.other	metal	en
dc.subject.other	nickel	en
dc.subject.other	polymer	en
dc.subject.other	electrical conductivity	en
dc.subject.other	particle size	en
dc.subject.other	powder	en
dc.subject.other	article	en
dc.subject.other	electric conductivity	en
dc.subject.other	oxidation	en
dc.subject.other	particle size	en
dc.subject.other	powder	en
dc.subject.other	pressure	en
dc.title	Influence of pressure on the electrical conductivity of metal powders used as fillers in polymer composites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.powtec.2003.11.010	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.powtec.2003.11.010	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	In this work, the influence of pressure on the electrical conductivity of metal powders (copper, nickel, and iron), used as fillers in conductive polymer composites, was investigated. It was found that the conductivity of the powders as a function of the applied pressure, P, is described by the equation: sigma = k(P-P-0)(n). In this equation, P-0 is the minimal pressure necessary for the appearance of conductivity and it is affected by the presence of oxidized layers on the surface of the metal particles. Exponent n depends on the kind of the powder and the particle size. It is also affected by the properties of the oxidized layers on the surface of the particles. Coefficient k depends only on the kind of the powder. It was shown that the conductivity of copper powder increases exponentially with increasing particle size. The value of the packing factor, F, increases with the applied pressure, due to the deformation of the particles. It is affected by the hardness of the powder particles. The conductivity of powders with small and big copper particles was compared with the conductivity of polymer composites, based on epoxy resin with the same powders as fillers. (C) 2004 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Powder Technology	en
dc.identifier.doi	10.1016/j.powtec.2003.11.010	en
dc.identifier.isi	ISI:000220908500007	en
dc.identifier.volume	140	en
dc.identifier.issue	1-2	en
dc.identifier.spage	49	en
dc.identifier.epage	55	en