49 KB1369 KB44 KB200020262006Grabke, Hans Jürgenštevilka:2letnik:409 stranistr. 39-47ISSN:1580-2949COBISSID:423338URN:URN:NBN:SI:doc-YP2SMJI2enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeoksidacijaravnovesjesegregacijaželezove zlitinežveploSegregation and oxidation| Segregacija in oksidacija|An introduction will be given in the fundamentals of equilibrium segregation, i.e. the enrichment of atoms or ions from solid solution at surfaces, grain boundaries and interfaces, occuring at elevated temperatures. Some examples of segregation and cosegregation on iron and iron alloys will be described, especially of sulfur segregation. The role of sulfur in the oxidation of iron, steels and chromia- or alumina-forming high temperature alloys is discussed in detail, since traces of sulfur can effectively deteriorate the adherence of protective scales on high temperature alloys. Segregation in and on oxides has been studied only for a few cases as yet. Most important is the effect of segregated reactive element ions on the growth mechanism and adherence of protective chromia and alumina scalesPodan je uvod v osnove ravnovesne segregacije, to je obogatitev z atomi ali ioni trdne raztopine, na njeni površini, mejah zrn in mejnih površinah pri povišanih temperaturah. Opisanih je nekaj primerov segregacije in kosegregacije pri železu in železnih zlitinah, posebno segregacija žvepla. Vloga žvepla v oksidaciji železa, jekel in tvorba zlitin kroma in/ali aluminija pri visokih temperaturah je opisana podrobno, saj lahko pri visokih temperaturah žveplo v sledeh izredno poslabša adhezijo zaščitnih plastiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije