25 KB1037 KB22 KB200020242013Balanović, LjubišaĆosović, VladanTalijan, NadeždaŽivković, Draganaštevilka:4letnik:47str. 447-452COBISSID:1003434ISSN:1580-2949URN:URN:NBN:SI:doc-XDKYIDTPenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeAg-Cd oxidation kineticselectrical-contact materialsinternal oxidationkadmijkemijska kinetikamicrostructuremikrostrukturaoksidacijasrebrozlitineInternal-oxidation kinetics of Ag-Cd alloys| Kinetika notranje oksidacije zlitin Ag-Cd|The oxidation kinetics of the Ag-Cd alloys with different Cd contents in mass fractions (9.5, 11, 12 and 16) % at (670, 750 and 795) °C during the production of Ag-CdO electrical-contact materials was investigated. It was found that the internal oxidation of the investigated Ag-Cd alloys generally follows the parabolic-rate law for all the applied oxidation times (5, 9.5, 20.5, 36 and 48) h. The parabolic-rate-law constant for the measured oxide-thickness gain was evaluated at every examined temperature and the Arrhenius-type equations were determined in order to describe the temperature dependence of the rate constants. Microstructures of the obtained Ag-CdO electrical-contact materials were investigated using a SEM-EDS analysis and the microstructure of a sample produced under the optimum process conditions is illustrated with the corresponding micrographs and chemical compositionsMed proizvodnjo materialov Ag-CdO za električne kontakte je bila preiskovana kinetika oksidacije zlitin Ag-Cd z različno vsebnostjo masnih deležev Cd (9,5,11, 12 in 16) % pri (670, 750 in 795) °C. Ugotovljeno je bilo, da se notranja oksidacija preiskovanih zlitin Ag-Cd ujema z zakonom parabolične odvisnosti hitrosti pri vseh časih oksidacije (5; 9,5; 20,5; 36 in 48) h. Konstanta parabolične odvisnosti hitrosti naraščanja debeline oksida je bila določena pri vsaki temperaturi preizkusa, prav tako je bila določena Arrheniusova vrsta enačbe za opis temperaturne odvisnosti konstant hitrosti. Mikrostruktura dobljenega materiala Ag-CdO za električne kontakte je bila preiskovana s SEM-EDS-analizami. Prikazana je bila mikrostruktura in narejena kemijska analiza vzorca, izdelanega v optimalnih razmerahTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije