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Thermal Barrier Coatings: Structures, Properties and Application
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Thermal Barrier Coatings: Structures, Properties and Application

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Ceramic Coatings and Engineering Technology".

Deadline for manuscript submissions: closed (20 January 2023) | Viewed by 6579

Special Issue Editor

Dr. Philipp Seiler

E-Mail Website
Guest Editor
Department of Mechanical Engineering, School of Engineering, University of Kent, Canterbury, UK
Interests: thermal barrier coatings; high-temperature alloys; lattice materials; hybrid structures

Special Issue Information

Dear Colleagues,

We are pleased to invite you to contribute to the MDPI Coatings Special Issue, “Thermal Barrier Coatings: Structures, Properties, and Applications”. This Special Issue aims to bring together original research articles and topical reviews with a focus on thermal barrier coatings for high-temperature applications. Thermal barrier coatings are used in thermally stressed areas in gas turbines and aircraft engines to protect structural components and increase process efficiency. It is important to gain a better understanding of the failure mechanism of traditional thermal barrier coating systems (consisting of a YSZ top-coat and an MCrAlY bond-coat) at elevated temperatures. It is also necessary to develop novel material solutions and coating processes. These new insights will pave the way to (i) further increasing gas temperatures, (ii) enhancing the lifetime of coating systems, and (iii) helping to establish thermal barrier coatings in novel engineering solutions, e.g., in reusable rocket engines. In this Special Issue, articles with fundamental or practical aspects are welcome. Research areas may include (but are not limited to) the following:

  • Processes for coating deposition
  • Coating modification
  • Material systems and selection
  • Mechanical and thermal testing
  • Theoretical and computational modeling
  • Characterization of microstructures and interfaces
  • Lifetime modeling and prediction

We look forward to receiving your contributions.

Dr. Philipp Seiler
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high-temperature coatings Atmospheric plasma spraying
  • electron-beam physical vapor deposition creep oxidation sintering failure mechanism
  • coating systems microstructure adhesive strength

Published Papers (3 papers)

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Research

15 pages, 5437 KiB  
Article
Solid Particle Erosion Behavior of La2Ce2O7/YSZ Double-Ceramic-Layer and Traditional YSZ Thermal Barrier Coatings at High Temperature
by Xianli Zhao, Wei Liu, Cong Li, Gang Yan, Qianwen Wang, Li Yang and Yichun Zhou
Coatings 2022, 12(11), 1638; https://doi.org/10.3390/coatings12111638 - 28 Oct 2022
Cited by 4 | Viewed by 1599
Abstract
Thermal barrier coatings (TBC) used for turbine blades are indispensable for the most advanced aero-engines due to their excellent thermal insulation performance. Solid particle erosion (SPE) at high temperatures is one of the most critical factors in TBC failure. The high-temperature SPE failure [...] Read more.
Thermal barrier coatings (TBC) used for turbine blades are indispensable for the most advanced aero-engines due to their excellent thermal insulation performance. Solid particle erosion (SPE) at high temperatures is one of the most critical factors in TBC failure. The high-temperature SPE failure behavior of TBC on circular sheets and turbine blades was investigated in this paper at erosion angles 60° and 90°. The high-temperature thermal shock behavior of TBC was also studied as the control group. The SPE failure mechanism of TBC is attributed to the spallation and thickness decrease of TBC. The formation of thermally grown oxide is the main reason for the TBC spallation, while the thickness decrease of TBC is due to the impaction of solid particles by near-surface cracking. The erosion angle is critical to the failure behavior of TBC, and TBC is more susceptible to SPE at an erosion angle of 60° than that at 90° because of the additional shear stress. Furthermore, a La2Ce2O7/YSZ double-ceramic-layer TBC was designed and deposited on turbine blades. The experimental results indicate that this type of double-layer TBC has more excellent performance under SPE than traditional YSZ TBC. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings: Structures, Properties and Application)
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16 pages, 10636 KiB  
Article
Investigation of Thermal Shock Behavior of Multilayer Thermal Barrier Coatings with Superior Erosion Resistance Prepared by Atmospheric Plasma Spraying
by Zining Yang, Kai Yang, Weize Wang, Ting Yang, Huanjie Fang, Linya Qiang, Xiancheng Zhang and Chengcheng Zhang
Coatings 2022, 12(6), 804; https://doi.org/10.3390/coatings12060804 - 9 Jun 2022
Cited by 2 | Viewed by 1906
Abstract
Gadolinium zirconate (GZ) has become a promising thermal barrier coating (TBC) candidate material for high-temperature applications because of its excellent high-temperature phase stability and low thermal conductivity compared to yttria-stabilized zirconia (YSZ). The double-ceramic-layered (DCL) coating comprised of GZ and YSZ was confirmed [...] Read more.
Gadolinium zirconate (GZ) has become a promising thermal barrier coating (TBC) candidate material for high-temperature applications because of its excellent high-temperature phase stability and low thermal conductivity compared to yttria-stabilized zirconia (YSZ). The double-ceramic-layered (DCL) coating comprised of GZ and YSZ was confirmed to possess better durability. However, the particle-erosion resistance of GZ is poor due to its low fracture toughness. In this study, a novel erosion-resistant layer, an Al2O3-GdAlO3 (AGAP) amorphous layer, was deposited as the top layer to resist erosion. Three triple-ceramic-layer (TCL) coatings comprised of an Al2O3-GAP layer as the top layer, a GZ layer, a GZ/YSZ composite layer, and a rare-earth-doped gadolinium zirconate (GSZC) layer as the intermediate layer, and a YSZ layer as the base layer. For comparison, an AGAP-YSZ DCL coating without a middle layer was prepared as well. Under the erosion speed of 200 m/s, only a small amount of spallation occurred on the surface of the Al2O3-GAP layer, indicating a superior particle-erosion resistance. In the thermal shock test, the Al2O3-GAP layer experienced glass transition and the glass transition temperature was close to 1500 °C. The hardness of the Al2O3-GAP coating after glass transition increased ~170% compared to the as-sprayed Al2O3-GAP coating. Moreover, The DCL TBC and TCL TBCs exhibited different failure mechanisms, which illustrated the necessity of the middle layer. The finite element model (FEM) simulation also shows that the introduction of the GZ layer can obviously reduce the thermal stress at the TC/BC interface. In terms of coating with a modified GZ layer, the AGAP-GZ/YSZ-YSZ coating and AGAP-GSZC-YSZ coating showed a similar failure model to the AGAP-GZ-YSZ coating, and the AGAP-GSZC-YSZ coating exhibited better thermal shock resistance. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings: Structures, Properties and Application)
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10 pages, 2766 KiB  
Article
The Effect of Bond Coat Roughness on the CMAS Hot Corrosion Resistance of EB-PVD Thermal Barrier Coatings
by Zhihang Xie, Qing Liu, Kuan-I. Lee, Wang Zhu, Liberty T. Wu and Rudder T. Wu
Coatings 2022, 12(5), 596; https://doi.org/10.3390/coatings12050596 - 27 Apr 2022
Cited by 6 | Viewed by 2256
Abstract
In a high-temperature, high-flame-velocity, and high-pressure gas corrosion environment, the intercolumnar pores and gaps of electron beam–physical vapor deposition (EB-PVD) thermal barrier coatings (TBCs) may serve as infiltration channels for molten calcium–magnesium–alumino–silicate (CMAS), leading to the severe degradation of TBCs. In order to [...] Read more.
In a high-temperature, high-flame-velocity, and high-pressure gas corrosion environment, the intercolumnar pores and gaps of electron beam–physical vapor deposition (EB-PVD) thermal barrier coatings (TBCs) may serve as infiltration channels for molten calcium–magnesium–alumino–silicate (CMAS), leading to the severe degradation of TBCs. In order to clarify the relationship between the roughness of the bond coat and the CMAS corrosion resistance of the EB-PVD TBCs, 7 wt.% yttria-stabilized zirconia (7YSZ) TBCs were prepared on the surfaces of four different roughness-treated bond coats. The effect of the bond coat roughness on the columnar microstructure of the EB-PVD YSZ was investigated. The effect of the change of the bond coat’s microstructure on the CMAS corrosion resistance of the EB-PVD YSZ was studied in detail. The results showed that the reduction in the roughness of the bond coat contributes to the improved formation of the EB-PVD YSZ columns. The small and dense columns are similar to a lotus leaf-like structure, which could reduce the wettability of CMAS and minimize the spread area between the coating and the CMAS melt. Thus, the CMAS corrosion resistance of the coating can be greatly improved. This preparation process also provides a reference for the preparation of other TBC materials, improving the resistance to CMAS hot corrosion. Full article
(This article belongs to the Special Issue Thermal Barrier Coatings: Structures, Properties and Application)
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