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Characterization of Microstructure and Thermal Properties of YSZ Coatings Obtained by Axial Suspension Plasma Spraying (ASPS)
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser. (PTW)ORCID-id: 0000-0003-1897-0171
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik. (PTW)ORCID-id: 0000-0003-0209-1332
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser. (PTW)
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser. (PTW)ORCID-id: 0000-0002-9578-4076
Vise andre og tillknytning
2015 (engelsk)Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 24, nr 7, s. 1195-1204Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The paper aims at demonstrating various microstructures which can be obtained using the suspension spraying technique and their respective significance in enhancing the thermal insulation property of a thermal barrier coating. Three different types of coating microstructures are discussed which were produced by the Axial Suspension Plasma Spraying. Detailed characterization of coatings was then performed. Optical and scanning electron microscopy were utilized for microstructure evaluations; x-ray diffraction for phase analysis; water impregnation, image analysis, and mercury intrusion porosimetry for porosity analysis, and laser flash analysis for thermal diffusivity measurements were used. The results showed that Axial Suspension Plasma Spraying can generate vertically cracked, porous, and feathery columnar-type microstructures. Pore size distribution was found in micron, submicron, and nanometer range. Higher overall porosity, the lower density of vertical cracks or inter-column spacing, and higher inter-pass porosity favored thermal insulation property of the coating. Significant increase in thermal diffusivity and conductivity was found at higher temperature, which is believed to be due to the pore rearrangement (sintering and pore coarsening). Thermal conductivity values for these coatings were also compared with electron beam physical vapor deposition (EBPVD) thermal barrier coatings from the literature and found to be much lower. © 2015 ASM International

sted, utgiver, år, opplag, sider
2015. Vol. 24, nr 7, s. 1195-1204
Emneord [en]
Coatings; Cracks; Diffusion; Diffusion barriers; Microstructure; Physical vapor deposition; Plasma jets; Plasma spraying; Pore size; Porosity; Scanning electron microscopy; Sintering; Thermal conductivity; Thermal diffusivity; Thermal insulation; Thermal spraying; X ray diffraction; Yttria stabilized zirconia, Axial injections; Columnar microstructures; Nanometer pores; Suspension plasma spraying; Vertical crack, Thermal barrier coatings
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-7886DOI: 10.1007/s11666-015-0263-xISI: 000363038600008Scopus ID: 2-s2.0-84944279460OAI: oai:DiVA.org:hv-7886DiVA, id: diva2:845768
Tilgjengelig fra: 2015-08-13 Laget: 2015-08-12 Sist oppdatert: 2018-11-13bibliografisk kontrollert
Inngår i avhandling
1. Microstructure and Thermal Conductivity of Liquid Feedstock Plasma Sprayed Thermal Barrier Coatings
Åpne denne publikasjonen i ny fane eller vindu >>Microstructure and Thermal Conductivity of Liquid Feedstock Plasma Sprayed Thermal Barrier Coatings
2016 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Thermal barrier coating (TBC) systems are widely used on gas turbine components to provide thermal insulation and oxidation protection. TBCs, incombination with advanced cooling, can enable the gas turbine to operate at significantly higher temperatures even above the melting temperature of the metallic materials. There is a permanent need mainly of environmental reasons to increase the combustion turbine temperature, hence new TBC solutions are needed.By using a liquid feedstock in thermal spraying, new types of TBCs can be produced. Suspension plasma/flame or solution precursor plasma spraying are examples of techniques that can be utilized for liquid feedstock thermal spraying.This approach of using suspension and solution feedstock, which is an alternative to the conventional solid powder feed stock spraying, is gaining increasing research interest, since it has been shown to be capable of producing coatings with superior coating performance.The objective of this research work was to explore relationships between process parameters, coating microstructure, thermal diffusivity and thermal conductivity in liquid feedstock thermal sprayed TBCs. A further aim was to utilize this knowledge to produce a TBC with lower thermal diffusivity and lower thermal conductivity compared to state-of-the-art in industry today, i.e. solid feed stock plasma spraying. Different spraying techniques, suspension high velocity oxy fuel,solution precursor plasma and suspension plasma spraying (with axial and radialfeeding) were explored and compared with solid feedstock plasma spraying.A variety of microstructures, such as highly porous, vertically cracked and columnar, were obtained. It was shown that there are strong relationships between the microstructures and the thermal properties of the coatings.Specifically axial suspension plasma spraying was shown as a very promising technique to produce various microstructures as well as low thermal diffusivity and low thermal conductivity coatings.

sted, utgiver, år, opplag, sider
Trollhättan: University West, 2016. s. 58
Serie
Licentiate Thesis: University West ; 9
Emneord
Microstructure, Thermal Barrier Coating; Axial Injection; Suspension Plasma Spraying; Suspension High Velocity Oxy Fuel Spraying; Solution Precursor Plasma Spraying; Porosity; Thermal Diffusivity; Thermal Conductivity
HSV kategori
Forskningsprogram
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-9061 (URN)978-91-87531-18-7 (ISBN)978-91-87531-19-4 (ISBN)
Opponent
Veileder
Tilgjengelig fra: 2016-02-11 Laget: 2016-02-10 Sist oppdatert: 2019-12-04bibliografisk kontrollert
2. Design of Suspension Plasma Sprayed Thermal Barrier Coatings
Åpne denne publikasjonen i ny fane eller vindu >>Design of Suspension Plasma Sprayed Thermal Barrier Coatings
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Thermal barrier coatings (TBCs) are widely used on gas turbine components to provide thermal insulation, which in combination with advanced cooling, can enable the gas turbine to operate at significantly higher temperatures even above the melting temperature of the metallic components. There is a permanent need,mainly due to environmental reasons, to increase the combustion temperature inturbines, hence new TBC solutions are needed. By using a liquid feedstock in thermal spraying, new types of TBCs can be produced. Suspension plasma/flame or solution precursor plasma spraying are examples of techniques that can be utilized for liquid feedstock thermal spraying. This approach of using suspension and solution feedstock, which is an alternative to the conventional solid powder feedstock spraying, is gaining increasing research interest since it has been shown to be capable of producing coatings withsuperior performance. The objective of this research work was to identify relationships between process parameters, coating microstructure, thermal conductivity and lifetime in suspension plasma sprayed TBCs. A further objective was to utilize these relationships to enable tailoring of the TBC microstructure for superior performance compared to state-of-the-art TBC used in industry today, i.e. solid feedstock plasma sprayed TBCs. Different spraying techniques, namely suspension high velocity oxy fuel, solution precursor plasma and suspension plasma spraying (with axial and radial feeding) were explored and compared to solid feedstock plasma spraying. A variety of microstructures, such as highly porous, vertically cracked and columnar, were produced and investigated. It was shown that there are strong relationships between microstructure, thermo-mechanical properties and performance of the coatings. Specifically, axial suspension plasma spraying wasshown as a very promising technique to produce various microstructures as wellas highly durable coatings. Based on the experimental results, a tailored columnar microstructure design for a superior TBC performance is also proposed.

sted, utgiver, år, opplag, sider
Trollhättan: University West, 2018. s. 96
Serie
PhD Thesis: University West ; 20
Emneord
Microstructure; Thermal Barrier Coatings; Axial Injection; Suspension Plasma Spraying; Porosity; Thermal Conductivity; Fracture Toughness; Lifetime
HSV kategori
Forskningsprogram
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-12336 (URN)978-91-87531-92-7 (ISBN)978-91-87531-91-0 (ISBN)
Disputas
2018-06-15, F104, University West, Trollhättan, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2018-05-25 Laget: 2018-05-23 Sist oppdatert: 2018-05-25

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