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 journalArticlepeer-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 languageEnglish
Pages (from-to)055924
JournalRSC Advances
Volume6
Issue number5
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Fingerprint

Dive into the research topics of 'CrAlN coating to enhance the power loss and magnetostriction in grain oriented electrical steel'. Together they form a unique fingerprint.

Cite this