{"?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-SXJXJ0NR/a5a6a3c8-2f91-47e8-9365-e761addf2671/HTML","dcterms:extent":"29 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-SXJXJ0NR/0706e0db-334e-4bd1-a6fd-836ec474cd73/PDF","dcterms:extent":"424 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-SXJXJ0NR/e5977543-fcbd-4cc2-80e5-96646face032/TEXT","dcterms:extent":"24 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-SXJXJ0NR","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":["Anđić, Zoran","Filipović, Dušica","Gavrilovski, Milorad","Kamberović, Željko","Raić, Karlo","Tasić, Miloš"],"dc:format":[{"@xml:lang":"sl","#text":"številka:1"},{"@xml:lang":"sl","#text":"letnik:45"},{"@xml:lang":"sl","#text":"str. 27-32"}],"dc:identifier":["ISSN:1580-2949","COBISSID:852138","URN:URN:NBN:SI:doc-SXJXJ0NR"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},"dc:subject":[{"@xml:lang":"sl","#text":"redukcija"},{"@xml:lang":"sl","#text":"volframov oksid"},{"@xml:lang":"sl","#text":"volframov prah"},{"@rdf:resource":"http://www.wikidata.org/entity/Q82682"}],"dcterms:temporal":{"@rdf:resource":"2000-2024"},"dc:title":{"@xml:lang":"sl","#text":"Reduction of ultra-fine tungsten powder with tungsten (VI)-oxide in a vertical tube reactor| Redukcija ultrafinih prahov volframovega(VI) oksida v reaktorju z vertikalno cevjo|"},"dc:description":[{"@xml:lang":"sl","#text":"The reduction of WO3 with hydrogen in a vertical tube reactor is a new approach to the reduction of tungsten oxide compared to conventional procedures in a stationary layer. The advantage of this method is the intensive contact between the reducent and the oxide particles, a higher degree and a shorter time of reduction of only a few seconds, compared to the several hours processing time in a horizontal tube reactor. The characterization of the WO3 powder and of the tungsten powder included a SEM microstructural examination and DT/TG analyses. The SEM examination of the tungsten powder indicates the presence of small particles with a size of about 1 m, also within an agglomerated porous foam structure. Tungsten powder with a particle size of less than 1 m is obtained at an optimal temperature with a suitable flow of hydrogen, as a result of stretching and the cracking of large particles, first in the reaction zone, and then, due to appropriate shock of the temperature, outside of this zone. Using an appropriate mathematical model, the degree of reduction and the time required for the formation of tungsten particles during the hydrogen reduction of WO3 in a vertical tube reactor were determined. Experimental studies have shown that the degree of reduction of WO3 with hydrogen in a vertical tube reactor increases with the temperature and the flow of hydrogen"},{"@xml:lang":"sl","#text":"Redukcija WO3 z vodikom v reaktorju z vertikalno cevjo je nov postopek v primerjavi s konvencionalnimi postopki v stacionarni plasti. Prednost postopka je intenziven kontakt med reducentom in oksidnimi zrni, kar izboljša in skrajša čas redukcije na nekaj sekund, medtem ko traja procesiranje v reaktorju z vodoravno celo nekaj ur. Karakterizacija prahov WO3 je obsegala SEM-opazovanje in DT/TG-analize. SEM-opazovanje volframovega prahu odkrije prisotnost majhnih delov z velikostjo 1 m s strukturo iz penastih aglomeratov. Volframov prah z velikostjo manjšo od 1 m dobimo pri optimalni temperaturi in ustreznem toku vodika kot rezultat obremenitve in razpokanja večjih delcev, najprej v reakcijski zoni nato pa zaradi temperaturnega šoka zunaj te zone. Razvit je bil računalniški model za nastanek zrn volframa z redukcijo WO3 z vodikom v reaktorju z vertikalno cevjo. Rezultati raziskave kažejo, da stopnja redukcije WO3 raste s temperaturo in s tokom vodika"}],"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-SXJXJ0NR","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-SXJXJ0NR"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-SXJXJ0NR/0706e0db-334e-4bd1-a6fd-836ec474cd73/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-SXJXJ0NR/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-SXJXJ0NR"}}}}