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Measurement techniques for the analysis of surface layers on grain oriented electrical steel. / Darren Poultney

Swansea University Author: Darren Poultney

Abstract

Fully processed, grain oriented electrical steel possesses a forsterite glass film and a phosphate-based insulation coating on both of its surfaces. The composition, quality and thickness of these layers, in addition to a preceding decarburisation oxide layer, are known to have a significant effect...

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Published: 2007
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42469
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first_indexed 2018-08-02T18:54:47Z
last_indexed 2018-08-03T10:10:14Z
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spelling 2018-08-02T16:24:29.3533874 v2 42469 2018-08-02 Measurement techniques for the analysis of surface layers on grain oriented electrical steel. a9a8143034d6aa841b4f7e0355a2c595 NULL Darren Poultney Darren Poultney true true 2018-08-02 Fully processed, grain oriented electrical steel possesses a forsterite glass film and a phosphate-based insulation coating on both of its surfaces. The composition, quality and thickness of these layers, in addition to a preceding decarburisation oxide layer, are known to have a significant effect on the properties of the material on which the final product is assessed. This includes physical properties, such as appearance, as well as the magnetic properties upon which the electrical steel is routinely graded. Due to their importance, methods of rapidly and accurately assessing these surface layers would provide great benefits as the characteristics could be monitored to ensure the optimum processing conditions are achieved. Unfortunately, it has previously been found that the complexity of the layers has made their analysis problematical, particularly in terms of accuracy and the time required for testing. A number of experimental techniques have been investigated to establish their potential for the analysis of the aforementioned surface layers, including Fourier Transform Infrared (FTIR), Electrochemical Potential (ECP), X-ray Photoelectron Spectroscopy (XPS) and Sputtered Neutral Mass Spectrometry (SNMS). Further methods were also used to determine characteristics of the coated material such as magnetostriction and magnetic loss, which provided an insight into the stressing capability of the material. As a result of these investigations: Combining a number of techniques resulted in a correlation between ECP profiles and the composition and / or morphology of the decarburisation oxide layer. A link has been established between the transmittance levels of the FTIR spectra and the thickness of the forsterite glass film layer. FTIR absorption bands have been linked to the constituents of the insulation coating. Further to the study into the feasibility of these methods, a number of the techniques were used to analyse material during the development of an alternative, chrome-free insulation coating, which has subsequently been adopted as the standard production coating for the grain oriented electrical steel produced at Orb Works. E-Thesis Materials science. 31 12 2007 2007-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.3533874 2018-08-02T16:24:29.3533874 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Darren Poultney NULL 1 0042469-02082018162456.pdf 10798177.pdf 2018-08-02T16:24:56.9500000 Output 30417636 application/pdf E-Thesis true 2018-08-02T16:24:56.9500000 false
title Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
spellingShingle Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
Darren Poultney
title_short Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
title_full Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
title_fullStr Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
title_full_unstemmed Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
title_sort Measurement techniques for the analysis of surface layers on grain oriented electrical steel.
author_id_str_mv a9a8143034d6aa841b4f7e0355a2c595
author_id_fullname_str_mv a9a8143034d6aa841b4f7e0355a2c595_***_Darren Poultney
author Darren Poultney
author2 Darren Poultney
format E-Thesis
publishDate 2007
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Fully processed, grain oriented electrical steel possesses a forsterite glass film and a phosphate-based insulation coating on both of its surfaces. The composition, quality and thickness of these layers, in addition to a preceding decarburisation oxide layer, are known to have a significant effect on the properties of the material on which the final product is assessed. This includes physical properties, such as appearance, as well as the magnetic properties upon which the electrical steel is routinely graded. Due to their importance, methods of rapidly and accurately assessing these surface layers would provide great benefits as the characteristics could be monitored to ensure the optimum processing conditions are achieved. Unfortunately, it has previously been found that the complexity of the layers has made their analysis problematical, particularly in terms of accuracy and the time required for testing. A number of experimental techniques have been investigated to establish their potential for the analysis of the aforementioned surface layers, including Fourier Transform Infrared (FTIR), Electrochemical Potential (ECP), X-ray Photoelectron Spectroscopy (XPS) and Sputtered Neutral Mass Spectrometry (SNMS). Further methods were also used to determine characteristics of the coated material such as magnetostriction and magnetic loss, which provided an insight into the stressing capability of the material. As a result of these investigations: Combining a number of techniques resulted in a correlation between ECP profiles and the composition and / or morphology of the decarburisation oxide layer. A link has been established between the transmittance levels of the FTIR spectra and the thickness of the forsterite glass film layer. FTIR absorption bands have been linked to the constituents of the insulation coating. Further to the study into the feasibility of these methods, a number of the techniques were used to analyse material during the development of an alternative, chrome-free insulation coating, which has subsequently been adopted as the standard production coating for the grain oriented electrical steel produced at Orb Works.
published_date 2007-12-31T03:53:01Z
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score 11.013148

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