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Thermal Barrier Coatings

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 7078

Special Issue Editor


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Guest Editor
University of La Rochelle, LaSIE UMR7356 Research Section, CNU 33 (Chemistry of Materials), CNRS Scientific Department, INSIS, La Rochelle, France
Interests: coatings; superalloys; steels; ceramics; high temperature; oxidation; corrosion; metallurgy; chemistry of materials

Special Issue Information

Dear colleagues,

Thermal barrier coatings (TBCs) are compulsorily applied on components operating at temperatures over or close to their melting temperatures. The thermal insulation provided by TBCs to the parts allow both to maintain their mechanical properties and to limit access of the aggressive environments to the metal substrates. Over the last decades, many different materials –mostly ceramics- have been fabricated through different methods including physical (PVD), chemical (CVD), thermal (thermal spray) and more recently, wet (slurry, sol-gel) methods. For the same type of ceramic material, the resulting properties can be quite different depending on such methods. An adequate balance between thermal insulation, mechanical properties and durability is often difficult to find though quite robust TBCs are operating today.

However, the increased operating temperatures of thermal power engines in the energy and transport systems requires further investigations of more advanced and exotic TBC systems that include new compositions, microstructures, and multilayering, among others. Such new TBCs will respond to the appearance of new degradation phenomena, including CMAS, more corrosive environments, greater loading mechanical cycles, and more erosive environments, in many practical applications. Further, sensor coatings allow one to facilitate quality control and the maintenance operations of the coatings. One key aspect is the use of adequate characterization techniques to evaluate accurately the TBCs.

This Special Issue on thermal barrier coatings covers aspects that include fabrication methods; conventional and new insulating materials (including sensor coatings); and derived thermal, mechanical, and corrosion-related properties. Contributions that provide an accurate characterization of TBCs are also welcome.

Prof. Fernando Pedraza
Guest Editor

Manuscript Submission Information

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Keywords

  • thermal barrier coatings (compositions, microstructures, crystal phases, sensor, and multilayers)
  • coating methods
  • thermal insulation
  • mechanical properties
  • corrosion and oxidation
  • sensor capabilities
  • characterization methods
  • maintenance

Published Papers (3 papers)

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Research

9 pages, 1530 KiB  
Article
The Influence of Reactive PS-PVD Process Parameters on the Microstructure and Thermal Properties of Yb2Zr2O7 Thermal Barrier Coating
by Paweł Pędrak, Marek Góral, Kamil Dychton, Marcin Drajewicz, Malgorzata Wierzbinska and Tadeusz Kubaszek
Materials 2022, 15(4), 1594; https://doi.org/10.3390/ma15041594 - 21 Feb 2022
Cited by 3 | Viewed by 1415
Abstract
Ytterbium zirconate (Yb2Zr2O7) is one of the most promising materials for yttria-stabilized zirconia (YSZ) replacement as a thermal barrier coating (TBCs) application. In the presented report, the experimental synthesis of Yb2Zr2O7 coating [...] Read more.
Ytterbium zirconate (Yb2Zr2O7) is one of the most promising materials for yttria-stabilized zirconia (YSZ) replacement as a thermal barrier coating (TBCs) application. In the presented report, the experimental synthesis of Yb2Zr2O7 coating using novel Reactive Plasma Spray Physical Vapor Deposition (Reactive PS-PVD) is described. The obtained coating, irrespective of the power current (1800, 2000 and 2200 A), was characterized by a hybrid structure and a thickness of about 80–110 μm. The results of XRD phase analysis showed the formation of ytterbium zirconate in the coating but the presence of ytterbium and zirconium oxides was also detected. The oxides were not observed in calcinated powder. The decrease in thermal conductivity with power current increase was observed. It was the result of higher thickness and better columnar structure of the coating obtained using higher power current of the plasma torch. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings)
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16 pages, 13306 KiB  
Article
Thermal Insulation of YSZ and Erbia-Doped Yttria-Stabilised Zirconia EB-PVD Thermal Barrier Coating Systems after CMAS Attack
by Germain Boissonnet, Christine Chalk, John R. Nicholls, Gilles Bonnet and Fernando Pedraza
Materials 2020, 13(19), 4382; https://doi.org/10.3390/ma13194382 - 01 Oct 2020
Cited by 17 | Viewed by 3006
Abstract
The impact of small deposits of calcium–magnesium–aluminium silicates (CMAS) on the top of thermal barrier coatings (TBCs) made of yttria-stabilised zirconia (YSZ) produced via electron-beam physical vapour deposition (EB-PVD) is shown to play a role in the microstructural and chemical stability of the [...] Read more.
The impact of small deposits of calcium–magnesium–aluminium silicates (CMAS) on the top of thermal barrier coatings (TBCs) made of yttria-stabilised zirconia (YSZ) produced via electron-beam physical vapour deposition (EB-PVD) is shown to play a role in the microstructural and chemical stability of the coatings; hence, it also affects the thermal insulation potential of TBCs. Therefore, the present work investigates the degradation potential of minor CMAS deposits (from 0.25 to 5 mg·cm−2) annealed at 1250 °C for 1 h on a novel Er2O3-Y2O3 co-stabilised ZrO2 (ErYSZ) EB-PVD TBC, which is compared to the standard YSZ coating. Due to the higher reactivity of ErYSZ coatings with CMAS, its penetration is limited in comparison with the standard YSZ coatings, hence resulting in a better thermal insulation of the former after ageing. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings)
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9 pages, 6845 KiB  
Article
Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy
by Mariusz Bogdan, Witold Zieliński, Tomasz Płociński and Krzysztof Jan Kurzydłowski
Materials 2020, 13(14), 3240; https://doi.org/10.3390/ma13143240 - 21 Jul 2020
Cited by 1 | Viewed by 1972
Abstract
The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature [...] Read more.
The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature of the changes as well as the structural changes in the various zones, a multi-factor analysis of the layers of the coating, including the observation of the surface of the blades, using, among others, electron microscopy, structural tests, surface morphology, and chemical composition testing, was carried out. As a result of the possibility of strengthening the physical foundations of the non-destructive testing of blades, the undertaken research mainly focused on the characteristics of the changes occurring in the outermost layers of the coatings. The obtained results indicate the structural degradation of the coatings, particularly the unfavorable changes, become visible after heating to 1050 °C. The main, strongly interacting, negative phenomena include pore formation, external diffusion of Fe and Cr to the surface, and the formation and subsequent thickening of Fe-Cr particles on the surface of the alumina layer. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings)
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