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Understanding and Development of Pseudo Glass Film for Grain Oriented Electrical Steel / ASHLEY HILL
Swansea University Author: ASHLEY HILL
PDF | E-Thesis – open access
Copyright: The author, Ashley S. Hill, 2022.Download (14.91MB)
DOI (Published version): 10.23889/SUthesis.60116
The mechanisms and the development of the surface oxide known as “Forsterite” during the high-temperature annealing process of electrical steel is not fully understood. Research has demonstrated that a uniform Forsterite layer develops at 1200oC and adding certain compounds to the magnesium slurry i...
|Supervisor:||Searle, Justin R.|
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The mechanisms and the development of the surface oxide known as “Forsterite” during the high-temperature annealing process of electrical steel is not fully understood. Research has demonstrated that a uniform Forsterite layer develops at 1200oC and adding certain compounds to the magnesium slurry improves consistency. This thesis investigates the development of Forsterite during the high-temperature coil annealing cycle and the effect of introducing selected compounds to the magnesium slurry on the Forsterite layer. Based on a literature review on the transition of Fayalite to Forsterite and the influence of high-temperature soak, an experiment was conducted on laboratory coated samples that were then heat-treated using a custom laboratory furnace. The heat treatment that was conducted was interrupted at various points during the heating phase and the high-temperature soak phase. An additional investigation into the effects of TiO2, V2O3 and FeO-Fe2O3 when added to the magnesium slurry has on Forsterite was also studied. The results indicate that magnesium-enriched surface is developed as early as 1050oC, and with the introduction of TiO2 to the magnesium slurry a Ti enriched region also develops at 1050oC as part of the surface oxide. Further research is needed to identify the compounds of the magnesium and titanium enriched regions.
Grain oriented electrical steel, Glass film, Forsterite
College of Engineering