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Microstructure, phase and dielectric strength of thermally sprayed alumina layers in coating‐based heating systems
Author(s) -
Mohammadian Bajgiran Morvarid,
Rezvani Rad Milad,
McDonald Andre,
Moreau Christian
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13731
Subject(s) - materials science , microstructure , composite material , coating , scanning electron microscope , dielectric , raman spectroscopy , layer (electronics) , optoelectronics , optics , physics
In coating‐based resistive heating systems applied on an electrically conductive substrate, an intermediary dielectric layer is required to minimize or eliminate leakage of current from the heating surface to the substrate. Aluminum oxide has widely been used for electrical insulation purposes. In this study, alumina was deposited onto carbon steel substrates by using suspension plasma spraying and flame spraying processes. Then, Ni‐20Cr, as the heating element, was deposited on the alumina layer by using air plasma spraying. The resultant microstructure and phase composition of the alumina layers were evaluated by using scanning electron microscope images, X‐ray diffraction analysis, and Raman spectroscopy. The breakdown voltage of alumina layers was measured independently and within the heating system. It was found that the dielectric properties of alumina layers were significantly affected by its microstructural features. It was observed that penetration of metal topcoat into the alumina layer decreased the overall breakdown voltage of the system.