Search results for "Wüstite"
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Quantitative determination of fayalite layers on iron by CEMS
1990
In the processing of silicon iron (Fe-3%) Si), so-called ‘fayalite layers’ are formed. By CEMS, they were found to consist of an outer Fe3+-oxide layer and an inner Fe2SiO4 (fayalite) layer. Sometimes an additional wustite contribution was found. Thef-factor of fayalite was determined experimentally (ffayalite/fα-Fe=0.47±0.04) and, by use of it, the thicknesses of the layers on some silicon iron samples could be calculated from CEMS data.
AES and CEMS analysis of the formation of layers on Si steel under thermal treatment in a flux of H2/water vapour
1991
The near surface diffusion and reaction processes in iron-silicon steel (3.1 wt.%Si) during 10 min decarburization in water vapour/hydrogen have been studied. The decarburization temperature has been varied between 506 and 714°C for the fixed partial pressure ratio pH2O/pH2=0.017. An outer layer of SiO2 forms on the surface with its thickness increasing with temperature. From 600°C upwards, the decarburization process is hindered and a cementite layer is formed below the SiO2 layer. The formation of fayalite at the surface has been studied at a fixed decarburization temperature with pH2O/pH2 ranging from 0.017 to 0.49. The scale thickness reduces abruptly just before the ratio pH2O/pH2 nece…