کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1281912 | 1497668 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Simultaneous oxidation and carburisation of chromia forming alloys Simultaneous oxidation and carburisation of chromia forming alloys](/preview/png/1281912.png)
Chromium forms both carbides and oxide at moderate and elevated temperatures. Because the carbides are less stable that Cr2O3, they form only when the chromia scale is permeable to a carbonaceous species, or when any scale is removed. On the other hand, because carbon has a much higher permeability in austenitic alloys than does oxygen, internal carburisation is much faster that internal oxidation. Reactions of chromium metal and model binary alloys with mixed gases at 900 °C were used to identify conditions under which chromia scales are permeable to carbon. The results are interpreted using a model based on permeating species interacting through competitive adsorption on internal surfaces within the scale. Reactions of commercial alloys with CO/CO2 gases, under temperature cycling conditions at 600–700 °C led to oxide scale damage and simultaneous internal precipitation of oxides and carbides.
Journal: International Journal of Hydrogen Energy - Volume 32, Issue 16, November 2007, Pages 3763–3769