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16-08-2019

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

Authors: Hyung-Ki Park, Min-Soo Han, Chang-Hwan Chang, Jong-Tae Park, Chang-Soo Park, Hyung-Don Joo

Published in: Metals and Materials International | Issue 3/2020

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Abstract

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.

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Metadata
Title
Comparison of the Crystallization Behavior of Silica Between Mg- and Al-Phosphate Used in Tension Coatings of Grain-Oriented Electrical Steel
Authors
Hyung-Ki Park
Min-Soo Han
Chang-Hwan Chang
Jong-Tae Park
Chang-Soo Park
Hyung-Don Joo
Publication date
16-08-2019
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 3/2020
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-019-00331-1

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