223 KB14 KB200020242014Dobrovská, JanaDobrovský, LudovítDudek, RostislavRosypalová, SilvieŽaludová, Monikaštevilka:3letnik:48str. 415-418COBISSID:1057706ISSN:1580-2949URN:URN:NBN:SI:doc-DYBGVQAAenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijecasting powderinterfacial tensionjeklolivni prašekmedfazna napetoststeelInterfacial tension at the interface of a system of molten oxide and molten steel| Medfazna napetost na stiku staljen oksidni sistem - staljeno jeklo|This paper is focused on a study of the interfacial tension between selected oxide and metal phases. The experimental research on the interfacial tension was performed in a horizontal resistive graphite Tamman furnace using an original method of measuring. This method consists of fixing both liquid phases in a horizontal position using a mandrel made of tungsten wire in a corundum cover. In this work the influence of the carbon content in the steel on the interfacial tension was studied. For this purpose a steel with 0.411 % of mass fraction of carbon and a steel with 2.64 % of carbon were used. Because of the wide variety of oxide systems used in industry, a characteristic system of casting powder was chosen for this study. This system contains dominant components, i.e., SiO2, CaO, Al2O3 and MgO, as well as a range of attendant mixtures, e.g., Fe2O3, TiO2 and Na2O. Simultaneously, the influence of SiO2 on the temperature dependence of the interfacial tension was observed. For this reason a concentration series with gradual additions of SiO2 was created. It was found that an increasing content of carbon in the steel significantly decreases the interfacial tension between the oxide system and the steel. The interfacial tension was found to decrease slightly with an increase in the content of SiO2 in the oxide systemČlanek predstavlja študijo medfazne napetosti med izbranim oksidom in kovinsko fazo. Določanje medfaznih napetosti je bilo izvršeno z originalno metodo v horizontalni uporovni grafitni Tammanovi peči. Ta metoda sestoji iz zadržanja obeh talin v horizontalnem položaju s trnom iz volframove žice in korundnega pokrova. V tem delu je bil preučevan vpliv ogljika v jeklu na medfazno napetost. Uporabljeno je bilo jeklo z masnim deležem 0,411 mas. % ogljika in jeklo z 2,64 % ogljika. Zaradi velike raznolikosti oksidnih sistemov, ki se uporabljajo v industriji, je bil za študij izbran livni prašek. Ta vsebuje glavne komponente, ki so SiO2, CaO, Al2O3 in MgO, ter vrsto primesi, kot so na primer Fe2O3, TiO2 in Na2O. Hkrati je bil opažen vpliv SiO2 na temperaturno odvisnost medfazne napetosti. Zato je bila pripravljena serija z naraščajočo vsebnostjo SiO2. Ugotovljeno je, da naraščanje vsebnosti ogljika v jeklu občutno zmanjša medfazno napetost med oksidnim sistemom in jeklom. Za medfazno napetost je ugotovljeno, da se nekoliko zmanjša, če se povečuje vsebnost SiO2 v oksidnem sistemuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije