Natural tourmaline as an efficient alternative to ceramic-type material for plasma spraying

Ctibor, Pavel; Nevrlá, Barbara; Pala, Zdeněk; Vrtiška, L.

doi:10.17159/2411-9717/2018/v118n4a9

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…During the spray process, the substrate was fixed (without any motion). The deposited coating thickness was about 3 mm and the layer was later removed from the substrate by thermal cycling at approximately −170/+100 • C. Details of (in principle very similar) spraying of other materials were reported in previous papers [31][32][33]. Morphologies of all feedstocks were similar to "fused and crushed" synthetic powders (not "agglomerated and sintered" powders).…”

Section: Sample Preparationmentioning

confidence: 60%

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

et al. 2019

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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.

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Section: Sample Preparationmentioning

confidence: 60%

“…Micrographs of the cross-sections are shown in Figure 1. Spray setup optimization was done as described in pervious papers [31][32][33]. Spraying of individual particles was done for optimization.…”

Section: Microstructure and Porositymentioning

confidence: 99%

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

et al. 2019

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“…Various natural ores, minerals, and mine wastes have been thermally sprayed recently onto metal substrates to achieve desired properties like corrosion, thermal, electrical, and wear resistance. 1 − 5 Some of the materials used in these coatings were ilmenite, garnet, olivine, hydroxyapatite, and basalt. 6 , 7 Natural materials such as diopside, forsterite, and tourmaline were studied as an alternative to ceramic type materials for electrical, thermal, and wear resistance properties.…”

Section: Introductionmentioning

confidence: 99%

“… 6 , 7 Natural materials such as diopside, forsterite, and tourmaline were studied as an alternative to ceramic type materials for electrical, thermal, and wear resistance properties. 1 , 8 , 9 Ceramics and minerals both have the ability to withstand their integrity at elevated pressure and temperatures; therefore, they can be used in harsh environmental conditions due to their sustainability and high melting temperatures. 10 Thermal spray method like atmospheric plasma spraying (APS) has been extensively used to study high melting temperature materials such as ceramics and minerals.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Natural Chromite Coating on Metal Substrate Using the Plasma Spray Process

et al. 2023

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Natural materials are gaining interest as coating feedstock because their “quality to cost” ratio is better and they are more environmentally friendly than most of the synthetic ceramics. They give sufficient protection to metal surfaces against harsh conditions such as corrosion, wear, and high temperature. In the current study, chromite mineral was beneficiated and reduced to two different sizes to be used as feedstock material for thermal spray coating. Powders were upgraded by gravity and magnetic separation, respectively, and thermally sprayed onto mild steel samples by using atmospheric plasma spray (APS) equipment. Morphology, structure, phases, elemental distribution of chromite powder, and coatings were studied using field emission scanning electron microscopy, X-ray diffraction, X-ray fluorescence spectroscopy, and energy-dispersive X-ray spectroscopy. Tribological properties of APS chromite coatings were investigated by using a ball-on-disk tribometer, and corrosion resistance properties were evaluated by carrying out potentiodynamic polarization testing in 3.5% NaCl solution. It is observed that the coating has better wear and corrosion resistance and is worn by abrasive wear that includes scratching and particles pull out. Coating efficiency, surface morphology, and microhardness of the coating developed by fine powder were better than those of coarse powder coating.

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“…At best, 40 to 45 % porosity were reached in Thermal Barrier Coatings (TBCs) applications [6], [7], [8], [9], [10], [11] or others applications. For instance, Ctibor et al [12] developed porous tourmaline deposits (44 % of porosity). An already described approach involves the use of pore formers.…”

Section: Introductionmentioning

confidence: 99%

Plasma spraying of mullite and pore formers for thermal insulating applications

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Quet

Meillot

et al. 2021

Surface and Coatings Technology

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Natural tourmaline as an efficient alternative to ceramic-type material for plasma spraying

Cited by 5 publications

References 11 publications

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

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

Development and Characterization of Natural Chromite Coating on Metal Substrate Using the Plasma Spray Process

Plasma spraying of mullite and pore formers for thermal insulating applications

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