CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel

Vishu Goel; Philip Anderson; Jeremy Hall; Fiona Robinson; Siva Bohm

doi:10.1063/1.4944340

CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel

Vishu Goel, Philip Anderson, Jeremy Hall, Fiona Robinson, Siva Bohm

Research output: Contribution to journal › Article › peer-review

Abstract

Grain oriented electrical steels (GOES) are coated with aluminium orthophosphate on top of a forsterite (Mg2SiO4) layer to provide stress and insulation resistance to reduce the power loss and magnetostriction. In this work Chromium Aluminium Nitride (CrAlN) was coated on GOES samples with electron beam physical vapour deposition and was tested in the single strip and magnetostriction tester to measure the power loss and magnetostriction before and after coating. Power loss was reduced by 2% after coating and 6 % post annealing at 800 °C. For applied compressive stress of 6 MPa, the magnetostrictive strain was zero with the CrAlN coating as compared to 22 and 24 μϵ for fully finished GOES and GOES without phosphate coating. The thickness of the coating was found to be 1.9 ± 0.2 μm estimated with Glow Discharge Optical Emission Spectroscopy (GDOES). The magnetic domain imaging showed domain narrowing after coating. The reduction in power loss and magnetostriction was due to the large residual compressive stress and Young’s modulus (270 GPa) of the coating.

Original language	English
Pages (from-to)	055924
Journal	RSC Advances
Volume	6
Issue number	5
DOIs	https://doi.org/10.1063/1.4944340
Publication status	Published - 1 May 2016
Externally published	Yes

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title = "CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel",

abstract = "Grain oriented electrical steels (GOES) are coated with aluminium orthophosphate on top of a forsterite (Mg2SiO4) layer to provide stress and insulation resistance to reduce the power loss and magnetostriction. In this work Chromium Aluminium Nitride (CrAlN) was coated on GOES samples with electron beam physical vapour deposition and was tested in the single strip and magnetostriction tester to measure the power loss and magnetostriction before and after coating. Power loss was reduced by 2% after coating and 6 % post annealing at 800 °C. For applied compressive stress of 6 MPa, the magnetostrictive strain was zero with the CrAlN coating as compared to 22 and 24 μϵ for fully finished GOES and GOES without phosphate coating. The thickness of the coating was found to be 1.9 ± 0.2 μm estimated with Glow Discharge Optical Emission Spectroscopy (GDOES). The magnetic domain imaging showed domain narrowing after coating. The reduction in power loss and magnetostriction was due to the large residual compressive stress and Young{\textquoteright}s modulus (270 GPa) of the coating. ",

author = "Vishu Goel and Philip Anderson and Jeremy Hall and Fiona Robinson and Siva Bohm",

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doi = "10.1063/1.4944340",

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TY - JOUR

T1 - CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel

AU - Goel, Vishu

AU - Anderson, Philip

AU - Hall, Jeremy

AU - Robinson, Fiona

AU - Bohm, Siva

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Grain oriented electrical steels (GOES) are coated with aluminium orthophosphate on top of a forsterite (Mg2SiO4) layer to provide stress and insulation resistance to reduce the power loss and magnetostriction. In this work Chromium Aluminium Nitride (CrAlN) was coated on GOES samples with electron beam physical vapour deposition and was tested in the single strip and magnetostriction tester to measure the power loss and magnetostriction before and after coating. Power loss was reduced by 2% after coating and 6 % post annealing at 800 °C. For applied compressive stress of 6 MPa, the magnetostrictive strain was zero with the CrAlN coating as compared to 22 and 24 μϵ for fully finished GOES and GOES without phosphate coating. The thickness of the coating was found to be 1.9 ± 0.2 μm estimated with Glow Discharge Optical Emission Spectroscopy (GDOES). The magnetic domain imaging showed domain narrowing after coating. The reduction in power loss and magnetostriction was due to the large residual compressive stress and Young’s modulus (270 GPa) of the coating.

AB - Grain oriented electrical steels (GOES) are coated with aluminium orthophosphate on top of a forsterite (Mg2SiO4) layer to provide stress and insulation resistance to reduce the power loss and magnetostriction. In this work Chromium Aluminium Nitride (CrAlN) was coated on GOES samples with electron beam physical vapour deposition and was tested in the single strip and magnetostriction tester to measure the power loss and magnetostriction before and after coating. Power loss was reduced by 2% after coating and 6 % post annealing at 800 °C. For applied compressive stress of 6 MPa, the magnetostrictive strain was zero with the CrAlN coating as compared to 22 and 24 μϵ for fully finished GOES and GOES without phosphate coating. The thickness of the coating was found to be 1.9 ± 0.2 μm estimated with Glow Discharge Optical Emission Spectroscopy (GDOES). The magnetic domain imaging showed domain narrowing after coating. The reduction in power loss and magnetostriction was due to the large residual compressive stress and Young’s modulus (270 GPa) of the coating.

U2 - 10.1063/1.4944340

DO - 10.1063/1.4944340

M3 - Article

VL - 6

SP - 055924

JO - RSC Advances

JF - RSC Advances

SN - 2046-2069

IS - 5

ER -

CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel

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