Barium titanate dielectrics sprayed by a high feed-rate water-stabilized plasma torch

0498221 - ÚFP 2019 RIV US eng J - Journal Article
Ctibor, Pavel - Lukáč, František - Sedláček, J. - Ryukhtin, Vasil
Barium titanate dielectrics sprayed by a high feed-rate water-stabilized plasma torch.
Journal of Materials Engineering and Performance. Roč. 27, č. 10 (2018), s. 5291-5299. ISSN 1059-9495. E-ISSN 1544-1024
R&D Projects: GA ČR GB14-36566G; GA MŠMT LM2015056
Institutional support: RVO:61389021 ; RVO:61389005
Keywords : BaTiO3 * electrical properties * microstructure * plasma spraying * reflectivity
OECD category: Materials engineering
Impact factor: 1.476, year: 2018
https://link.springer.com/article/10.1007%2Fs11665-018-3622-1

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 usedstainless steel and carbon steel. Various substrate preheating levels from 125 to 450 degrees 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 propertieson 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.
Permanent Link: http://hdl.handle.net/11104/0290607