{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-3LJPHTJ6/167fdda9-15fd-4ca4-ad7a-ac6b93248d99/HTML","dcterms:extent":"61 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-3LJPHTJ6/c22e648f-fd1f-4123-ad26-e75d9c3e3df8/PDF","dcterms:extent":"371 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-3LJPHTJ6/9b8771b0-e61a-4b9b-afc2-04af63e96bd9/TEXT","dcterms:extent":"39 KB"}],"edm:TimeSpan":{"@rdf:about":"2000-2024","edm:begin":{"@xml:lang":"en","#text":"2000"},"edm:end":{"@xml:lang":"en","#text":"2024"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-3LJPHTJ6","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/urn:nbn:si:spr-ihg6vo21"},{"@xml:lang":"sl","#text":"Materiali in tehnologije"}],"dcterms:issued":"2011","dc:creator":["Jenko, Monika","Kevorkijan, Varužan","Lažeta, Marjana","Paulin, Irena","Škapin, Srečo D.","Šuštaršič, Borivoj"],"dc:format":[{"@xml:lang":"sl","#text":"številka:2"},{"@xml:lang":"sl","#text":"letnik:45"},{"@xml:lang":"sl","#text":"str. 95-103"}],"dc:identifier":["ISSN:1580-2949","COBISSID:856490","URN:URN:NBN:SI:doc-3LJPHTJ6"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},"dc:subject":[{"@xml:lang":"sl","#text":"aluminijeve pene"},{"@xml:lang":"sl","#text":"dolomit"},{"@xml:lang":"sl","#text":"kalcijev karbonat"},{"@xml:lang":"sl","#text":"karakterizacija"},{"@xml:lang":"sl","#text":"penila"},{"@rdf:resource":"http://www.wikidata.org/entity/Q23767"}],"dcterms:temporal":{"@rdf:resource":"2000-2024"},"dc:title":{"@xml:lang":"sl","#text":"Influence of the foaming precursor's composition and density on the foaming efficiency, microstructure development and mechanical properties of aluminium foams| Vpliv sestave in gostote prekurzorjev za penjenje na učinkovitost penjenja ter razvoj mikrostrukture in mehanskih lastnosti aluminijskih pen|"},"dc:description":[{"@xml:lang":"sl","#text":"In this work, the influence of the composition, density and porosity of foaming precursors on the foaming efficiency, microstructure development and mechanical properties of aluminium foams are presented and discussed. The foams were prepared, starting from precursors made either by powder metallurgy (PM) or by the melt route. Following the PM route, precursors were made by mixing Al powder and 3-10 % of volume fractions of dolomite or calcium carbonate particles of particle size from 20 mum to 120 mum and cold isostatically pressing the mixture at 700 MPa. In the case of the melting route, precursors were made by introducing dolomite or calcium carbonate particles directly into the molten aluminium at 700 compositumC. After melt stirring, the precursors were prepared by casting the semi-solid slurry into a cylindrical, water-cooled mould. Finally, aluminium foams were made in all cases by inserting precursors into a cylindrical stainless-steel mould and heating the arrangement at 750 compositumC for 10 min. After that, the mould was removed from the furnace and the foaming process was stopped by cooling in air to room temperature. The microstructure of the obtained foams was investigated by optical and scanning electron microscopy (SEM-EDS), while XRD was applied for a detailed identification of phases. The quality of the precursors was evaluated by determining their mechanical properties (uniaxial room-temperature compression stress-strain curve, compressive strength and energy absorption after a 30 % strain) and the foaming efficiency (the relative density of the foam obtained). The concentration of the foaming agent and the density of precursors were found to have a detrimental influence on the foaming efficiency as well as on the foam's microstructure and mechanical properties. The foaming of precursors with open porosity were inefficient"},{"@xml:lang":"sl","#text":"V delu poročamo o vplivu sestave ter gostote oz. poroznosti prekurzorja za penjenje na učinkovitost penjenja ter razvoj mikrostrukture in mehanskih lastnosti aluminijevih pen. Pene smo izdelovali z uporabo prekurzorjev na osnovi Al s homogeno porazdeljenimi delci dolomita ali kalcijevega karbonata. Prekurzorje smo pripravljali po postopku prašne metalurgije (PM) in z litjem taline, kar je cenejše, zagotavlja pa manj homogeno porazdelitev sredstva za penjenje. S PM-postopkom smo prekurzorje za penjenje izdelovali iz zmesi Al prahu in 3-10 % dolomita ali kalcijevega karbonata različne povprečne velikosti (od 20 mim do 120 mim), ki smo jo izostatsko stisnili pri 700 MPa. Z litjem smo prekurzorje pripravljali tako, da smo delce penila uvajali v Al-talino, segreto do največ 700 kompozitumC, premešali in nastalo suspenzijo ulili v cilindričen, vodno hlajen jekleni model. Pene smo iz obeh vrst prekurzorjev izdelovali tako, da smo prekurzor vstavili v zaprt jeklen model za penjenje, segrevali pri 750 kompozitumC 10 min. ter nato ohlajali na zraku do sobne temperature. Mikrostrukturo nastalih pen smo preučevali z optično in elektronsko (SEM/EDS) mikroskopijo, in sicer tako, da smo ugotavljali morfologijo in povrečno velikost por, sestavo vsebovanih faz pa z metodo rentgenske (XRD) difrakcije. Gostoto prekurzorjev in pen smo določali na osnovi mase in izračunane prostornine strojno obdelanih vzorcev, učinkovitost penjena (relativno gostoto dobljene pene) pa na osnovi primerjave dejansko dosežene gostote pene in gostote aluminija. Primerjalno smo gostoto pen določali tudi z Arhimedovo metodo. Kakovost izdelanih pen smo ocenjevali na osnovi njihovih mehanskih lastnosti (krivulje napetost - deformacija pri sobni temperaturi, tlačne trdnosti in sposobnosti absorpcije energije pri 30-odstotni deformaciji). Ugotovili smo, da na učinkovitost penjena ter razvoj mikrostrukture in mehanskih lastnosti vplivata predvsem kemijska sestava in gostota prekurzorja za penjenje, pri čemer je bilo prekurzorje z odprto poroznostjo nemogoče peniti"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-3LJPHTJ6","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-3LJPHTJ6"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-3LJPHTJ6/c22e648f-fd1f-4123-ad26-e75d9c3e3df8/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-3LJPHTJ6/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-3LJPHTJ6"}}}}