Comparison of the Crystallization Behavior of Silica Between Mg- and Al-Phosphate Used in Tension Coatings of Grain-Oriented Electrical Steel

The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on the crystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coated with a Mg-phosphate was improved, while that coated...

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Bibliographic Details
Published in:Metals and materials international 2020, 26(3), , pp.321-325
Main Authors: Park, Hyung-Ki, Han, Min-Soo, Chang, Chang-Hwan, Park, Jong-Tae, Park, Chang-Soo, Joo, Hyung-Don
Format: Article
Language:English
Subjects:
Aluminum
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coatings
Core loss
Cracks
Crystallization
Domain walls
Electrical steels
Engineering Thermodynamics
Heat and Mass Transfer
Machines
Magnesium
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Metallic Materials
Phosphate coatings
Phosphates
Processes
Silicon dioxide
Solid Mechanics
Tensile stress
Thermal stability
재료공학
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Summary:The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on the crystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coated with a Mg-phosphate was improved, while that coated with an Al-phosphate was deteriorated. The domain wall spacing of the samples coated with Mg- and Al-phosphates was respectively increased and decreased after stress relief annealing. This means that the stress relief annealing did not much diminish the tensile stress for Mg-phosphate coating but much diminished the tensile stress for Al-phosphate coating. Based on FTIR and XRD results, we found that the crystallization temperature of silica with Al-phosphate was lower than that of silica with Mg-phosphate. The crystallization of silica was accompanied by an abrupt volume change, which formed cracks in the tension coating and deteriorated the tensile stress.
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-019-00331-1