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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 10/2018

31-08-2018

Barium Titanate Dielectrics Sprayed by a High Feed-Rate Water-Stabilized Plasma Torch

Published in: Journal of Materials Engineering and Performance | Issue 10/2018

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Abstract

Barium titanate coatings were first time sprayed by a high feed-rate plasma torch with water stabilization. Two power levels of the torch were applied. Two substrate materials were used—stainless steel and carbon steel. Various substrate preheating levels from 125 to 450 °C were applied to change the cooling conditions. Microstructure, phase composition including crystallinity quantification, surface roughness and microhardness were evaluated. Dielectric measurements proved that coatings with medium-level relative permittivity and with stable loss factor course versus frequency of the AC electric field were fabricated by spraying. The cold substrates provided coatings with low reflectivity and visibly darker surface compare to the hot substrates. The coatings exhibited good dielectric properties—on the top of an expectable range for plasma-sprayed BaTiO3. This study is targeted to coatings prospective for electrical industry, namely via optimization of conditions at the high feed-rate spraying.
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Metadata
Title
Barium Titanate Dielectrics Sprayed by a High Feed-Rate Water-Stabilized Plasma Torch
Publication date
31-08-2018
Published in
Journal of Materials Engineering and Performance / Issue 10/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3622-1

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