Formation mechanism of surface oxide layer of grain-oriented silicon steel
| Autor: | Qiu Shengtao, Fei-hu Guo, Haijun Wang, Jia-long Qiao, Xing-zhong Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Decarburization Scanning electron microscope Annealing (metallurgy) 0211 other engineering and technologies Metals and Alloys Nucleation Oxide 02 engineering and technology engineering.material 01 natural sciences chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials 0103 physical sciences Materials Chemistry engineering Lamellar structure Surface layer 021102 mining & metallurgy Electrical steel |
| Zdroj: | Journal of Iron and Steel Research International. 28:327-334 |
| ISSN: | 2210-3988 1006-706X |
| DOI: | 10.1007/s42243-020-00464-3 |
| Popis: | The surface oxide layer of grain-oriented electrical steels was investigated by scanning electron microscopy. The formation mechanism and the influence on the glass film of the surface oxide layer were analyzed by the calculation of thermodynamics and kinetics. The surface oxide layer with 2.3 μm in thickness is mainly composed of SiO2, a small amount of FeO and Fe2SiO4. During the formation of surface oxide layer, the restriction factor was the diffusion of O in the oxide layer. At the initial stage of the decarburization annealing, FeO would be formed on the surface layer. SiO2 and silicate particles rapidly nucleated, grew and formed a granular oxide layer in the subsurface. As the oxidation layer thickens, the nucleation of new particles decreases, and the growth of oxide particles would be dominant. A lamellar oxide layer was formed between the surface oxide layer and the steel matrix, and eventually formed a typical three-layer structure. During the high temperature annealing, MgO mainly reacted with SiO2 and Fe2SiO4 in the surface oxide layer to form Mg2SiO4 and Fe2SiO4 would respond first, thus forming the glass film with average thickness of 4.87 μm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink