6533b85dfe1ef96bd12be618
RESEARCH PRODUCT
Layer formation on silicon steel by processing in H2/H2O at elevated temperatures
P. GütlichW. MeiselP. Griesbachsubject
Nuclear and High Energy PhysicsAuger electron spectroscopyMaterials scienceDecarburizationHydrogenMetallurgyIron oxidechemistry.chemical_elementengineering.materialCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCarbidechemistry.chemical_compoundchemistryConversion electron mössbauer spectroscopyengineeringFayalitePhysical and Theoretical ChemistryElectrical steeldescription
Silicon steel (Fe-3wt%Si), as used for transformers and generators, has been annealed in wet hydrogen at elevated temperatures. The composition, sequence, and thicknesses of the layers found by conversion electron Mossbauer spectroscopy (CEMS) and Auger electron spectroscopy (AES) depth profiling for a 10 minutes anneal in different atmospheres are reported. In the range from 500°C to 720°C we observed carbide formation, indicating that the decarburization is hindered. Above 800°C, the layers consist of fayalite or of fayalite and iron oxides, depending on the oxygen potentialaO. At 843°C, the onset of iron oxide formation was found ataO=0.33.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-04-01 | Hyperfine Interactions |