Process and properties of dense and porous vertically-cracked yttria stabilized zirconia thermal barrier coatings

Chen, Dianying; Dambra, Christopher; Dorfman, Mitchell R.

doi:10.1016/j.surfcoat.2020.126467

Cited by 26 publications

(6 citation statements)

References 25 publications

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“…As the thermomechanical properties of TBCs are strongly dependent on the microstructure of the coating [61,75,93,124,125], the structure can be optimized in terms of the chemical composition, pore and crack distribution to achieve high thermal insulation and a long lifespan. Some methods to tailor the microstructure have been reported, including segmentation-cracked coatings, porous coatings, dense coatings, columnar coatings, gradient coatings, or multilayer coatings, by optimizing the spraying parameters or adopting various powders [50,[126][127][128][129][130][131][132]. TTBCs exhibit a range of properties according to their structures.…”

Section: Enhanced Durability Of Ttbcsmentioning

confidence: 99%

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

et al. 2023

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Thermal barrier coatings (TBCs) are a fundamental technology used in high-temperature applications to protect superalloy substrate components. However, extreme high-temperature environments present many challenges for TBCs, such as the degradation of their thermal and mechanical properties. Hence, highly insulating, long-life TBCs must be developed to meet higher industrial efficiency. This paper reviews the main factors influencing the thermal insulation performance of TBCs, such as material, coating thickness, and structure. The heat transfer mechanism of the coating is summarized, and the degradation mechanism of the thermal insulation is analyzed from the perspective of the coating structure. Finally, the recent advances in improving the thermal insulation and lifetime of coatings are reviewed in terms of advanced materials and structural design, which will benefit advanced TBCs in future engineering applications and provide guidance for the next generation of high thermal insulating TBCs.

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Section: Enhanced Durability Of Ttbcsmentioning

confidence: 99%

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

et al. 2023

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“…The same activation energy meant that the charge carrier (O 2− ) was the same; higher resistivity meant that the O 2− percolation path was larger due to the existence of pores to be circumvented. The overall results showed the possibility of using either potassium chloride or lithium fluoride as sacrificial pore formers to prepare, by conventional sintering, zirconia that was fully yttria stabilized to be used as matrix in, e.g., dual phase membranes for chemical species capture [28] or thermal barrier coatings [29].…”

Section: Impedance Spectroscopymentioning

confidence: 99%

“…The interdependence among sintering conditions, electrical properties, and porosity in liquid-phase, flash-sintered 8YSZ (with LiF as a sintering additive) has already been shown [26]; however, the sintering process in that case was faster due to Joule heating promoted by an electric current through the sample in an electric field. Porous 8YSZ is also used in in microporous membranes for gas nanofiltration [7] and carbon dioxide capture [27] and in thermal barrier coatings [28].…”

Section: Introductionmentioning

confidence: 99%

Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives

Diaz

Muccillo

2023

Materials

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8 mol% Y2O3-stabilized ZrO2 (8YSZ) ceramics were prepared with KCl and LiF additions to obtain porous specimens with high skeletal density. Thermogravimetric and differential thermal analyses (TG/DTA) were carried out on 8YSZ and on 8YSZ mixed to 5 wt.% KCl or 5 wt.% LiF as sacrificial pore formers that were thermally removed during sintering. The melting and evaporation of the alkali halides were evaluated by differential thermal analysis. Dilatometric analysis was also carried out following the same TG/DTA temperature profile with results suggesting rearrangement of the 8YSZ particles during LiF and KCl melting. The dilatometric data of 8YSZ green pellets mixed to KCl or LiF exhibited an initial expansion up to the melting of the alkali halide, followed by shrinkage due to sintering evolution with grain growth and pore elimination. The time that the alkali halide molten phase was kept during sintering was found to be an important parameter for obtaining 8YSZ-sintered specimens with specific pore content; bulk density and open porosity could then be tuned by controlling the time the alkali halide remained liquid during sintering. Scanning electron microscopy images of the pellet fracture surfaces showed pores that contributed to increasing the electrical resistivity as evaluated by impedance spectroscopy analysis.

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“…In addition, Y 2 O 3 exhibits high dielectric permittivity, high breakdown strength, and large band gap energy, which makes it useful as a gate oxide for metal-oxide-semiconductor field effect transistors and as a dielectric for metal-insulator-metal capacitors [3,4]. Furthermore, Y 2 O 3 is a constituent of a high-𝑇𝑐 superconductor YBa 2 Cu 3 O 7−x (YBCO) and Y 2 O 3 -stabilized ZrO 2 (YSZ) thermal barrier coatings [5][6][7]. YSZ and Y 2 O 3 -doped CeO 2 are solid-state electrolytes in solid oxide fuel cells and solid-state gas sensors [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Structure and Photoluminescence of Optically Transparent Y₂O₃:Eu Thin Films Prepared on Sapphire Substrates by RF Magnetron Sputtering

Jeong

Kim

2021

Appl. Sci. Converg. Technol.

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The Y 2 O 3 :Eu films were prepared on sapphire substrates by radio frequency magnetron sputtering. The samples were post-annealed in an air ambient at different temperatures. The Y 2 O 3 :Eu films prior to annealing did not show photoluminescence (PL), however, after annealing, the films became capable of emitting photoluminescent light. The PL spectra were composed of several peaks originating from the transitions between 4𝑓 energy levels of the Eu 3+ ion, from 5 𝐷 0 to 7 𝐹 𝐽 where 𝐽 = 0, 1, 2 ,3, and 4. The PL intensity increased upon annealing at higher temperatures, which was due to the higher degree of crystallinity. The PL intensity decreased above 1200 ○ C resulting from the formation of yttrium aluminate phases, such as YAM (Y 4 Al 2 O 9 ), YAP (YAlO 3 ), and YAG (Y 3 A l5 O 12 ). The unannealed Y 2 O 3 :Eu films exhibited a high optical transmittance in the visible to near-infrared wavelength range. The transmittance of the films decreased as annealing temperature increased due to increase in crystallite sizes.

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Process and properties of dense and porous vertically-cracked yttria stabilized zirconia thermal barrier coatings

Cited by 26 publications

References 25 publications

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives

Structure and Photoluminescence of Optically Transparent Y₂O₃:Eu Thin Films Prepared on Sapphire Substrates by RF Magnetron Sputtering

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Process and properties of dense and porous vertically-cracked yttria stabilized zirconia thermal barrier coatings

Cited by 26 publications

References 25 publications

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives

Structure and Photoluminescence of Optically Transparent Y2O3:Eu Thin Films Prepared on Sapphire Substrates by RF Magnetron Sputtering

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Structure and Photoluminescence of Optically Transparent Y₂O₃:Eu Thin Films Prepared on Sapphire Substrates by RF Magnetron Sputtering