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Open AccessFeature PaperArticle

Plasma Spray Coatings of Natural Ores From Structural, Mechanical, Thermal, and Dielectric Viewpoints

1
Institute of Plasma Physics, ASCR, Za Slovankou 3, 182 00 Prague 8, Czech Republic
2
Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University, Technická 2, 166 27 Prague 6, Czech Republic
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(1), 3; https://doi.org/10.3390/coatings10010003
Received: 30 October 2019 / Revised: 2 December 2019 / Accepted: 13 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Advanced Coating for High Temperature Applications)
Various natural materials, namely ilmenite, diopside, tourmaline, olivine, garnet, and basalt, were plasma-sprayed and analyzed. This paper summarizes the various achievements of our earlier research and adds new results—mainly dielectric and optical characterizations. Plasma spraying of all of the materials was rather easy with a high feed-rate plasma system, which could process many kilograms of powder per hour. For easier characterizations, the coatings were detached from substrates in order to remain self-supporting. The plasma-sprayed layers that were coated from all studied materials acted as medium-permittivity and low-loss dielectrics, antireflective optical materials, and medium quality anti-abrasive barriers. Phase composition and microhardness were evaluated in addition to microstructure observations. Some coatings were amorphous and crystallized after further heating. As the melting points were well above 1000 °C, all of them could also serve as thermal barriers for aluminum alloys and similar metals. The only material that was not easily sprayed was tourmaline, which gave very porous coatings without environmental barrier or dielectric characteristics. View Full-Text
Keywords: plasma spraying; olivine (Mg,Fe)2SiO4; ilmenite FeTiO3; diopside CaMgSi2O6; almandine garnet Fe3Al2(SiO4)3; tourmaline NaFe3Al6(BO3)3Si6O18(OH,F)4; basalt plasma spraying; olivine (Mg,Fe)2SiO4; ilmenite FeTiO3; diopside CaMgSi2O6; almandine garnet Fe3Al2(SiO4)3; tourmaline NaFe3Al6(BO3)3Si6O18(OH,F)4; basalt
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MDPI and ACS Style

Ctibor, P.; Nevrlá, B.; Neufuss, K.; Petrášek, J.; Sedláček, J. Plasma Spray Coatings of Natural Ores From Structural, Mechanical, Thermal, and Dielectric Viewpoints. Coatings 2020, 10, 3.

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