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Understanding and Development of Pseudo Glass Film for Grain Oriented Electrical Steel / ASHLEY HILL

Swansea University Author: ASHLEY HILL

DOI (Published version): 10.23889/SUthesis.60116

Abstract

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...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Searle, Justin R.
URI: https://cronfa.swan.ac.uk/Record/cronfa60116
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Abstract: 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.
Keywords: Grain oriented electrical steel, Glass film, Forsterite
College: College of Engineering