23 KB840 KB19 KB200020242011Avdiaj, SeferErjavec, BojanŠetina, BarbaraŠetina, Janezštevilka:1letnik:45str. 33-37ISSN:1580-2949COBISSID:850602URN:URN:NBN:SI:doc-8HNWUREFenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijecirkonijdifuzijageterLavesove fazemikrostrukturaoksidne plastizirconiumOxygen diffusion in the non-evaporable getter St 707 during heat treatment| Difuzija kisika v getru St 707 med toplotno obdelavo|The oxygen diffusion and microstructure were investigated in specimens of commercial Non Evaporable Getter under the trademark of St 707, which is an alloy of Zr(70)-V(24.6)-Fe(5.4) using EDS, AES and XRD. Specimens were in the form of tablets compressed from St 707 powder of typical particle size from 50 m to 100 m. To obtain an observable amount of oxygen in the bulk material,we loaded the getter specimen at 450 °C at oxygen partial pressure of 1.2 10-4 Pa for 1 h. Using AES and EDS we investigated the distribution ofoxygen in different phases of the alloy. From the concentration profile, we can see the considerable diffusion length of the oxygen into the getter. This diffusion length is much larger in the Laves phase compared to the zirconium phase. On the zirconium phase two different layers are formed, an oxide layer composed of ZrO2 followed by a diffusion layer, while on the Laves phase only a diffusion layer can be found. In this paper, we also determined the phases present in our materials, as well as the changes of these phases after oxidationPreučevali smo mikrostrukturo in difuzijo kisika v neuparljivih getrih St 707 (zlitina Zr(70)-V(24,6)-Fe(5,4)) z metodami EDS, AES in XRD. Preizkušanci so bili v obliki stisnjenih tablet z značilno velikostjo delcev med 50 m in 100 m. Pri temperaturi 450 °C smo preizkušance izpostavili kisiku pri tlaku 1.2 10-4 Pa za 1 h. Z metodami AES in EDS smo opazili različno povečanje vsebnosti kisika v različnih fazah zlitine. Iz koncentracijskega profila je razvidna velika difuzijska dolžina za kisik v getrskem materialu. V Lavesovih fazah opazimo znatno daljšo difuzijsko dolžino kot v cirkonijevi fazi. Na površini cirkonijeve faze smo našli dve različni plasti. Na vrhu je oksidna plast ZrO2, ki ji sledi difuzijska plast. V Lavesoih fazah pa najdemo le difuzijsko plast. Prav tako smo ugotovili fazno sestavo materiala in spremembe zaradi oksidacijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije