Special Issue "Thermal Barrier Coatings"

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

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editor

Prof. Fernando Pedraza
E-Mail Website
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 (2 papers)

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Research

Open AccessArticle
Thermal Insulation of YSZ and Erbia-Doped Yttria-Stabilised Zirconia EB-PVD Thermal Barrier Coating Systems after CMAS Attack
Materials 2020, 13(19), 4382; https://doi.org/10.3390/ma13194382 - 01 Oct 2020
Cited by 2 | Viewed by 536
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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Open AccessArticle
Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy
Materials 2020, 13(14), 3240; https://doi.org/10.3390/ma13143240 - 21 Jul 2020
Viewed by 572
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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