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Coatings
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Preparation and Failure Mechanism of Thermal Barrier Coatings
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Preparation and Failure Mechanism of Thermal Barrier Coatings

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 (30 March 2024) | Viewed by 3459

Special Issue Editors

Prof. Dr. Wang Zhu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Xiangtan University, Xiangtan, China
Interests: ceramic materials for thermal barrier coatings; high-temperature mechanical property characterization; failure mechanism and real-time detection; high-temperature corrosion; material design and high-temperature testing
Special Issues, Collections and Topics in MDPI journals
Dr. Fan Zhang

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Xiangtan University, Xiangtan, China
Interests: ceramic materials for thermal barrier coatings; phase diagram and phase transformation; high temperature corrosion; material design and testing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

A new Special Issue, entitled “Preparation and Failure Mechanism of Thermal Barrier Coatings”, has been launched. This Special Issue solicits contributions related to the latest experimental and theoretical developments in the design, characterization, failure analysis, and applications of thermal barrier coatings.

Thermal barrier coatings (TBCs) are often used as high-temperature-resistant protective coatings for the thermal protection and corrosion protection of aero engines. However, degradation occurs both in thermal and mechanical performances during service. Thus, understanding the degradation and failure mechanisms of TBCs is significant in the assessment and further enhancement of the durability and reliability of TBCs. This Special Issue aims to bring together original research articles and topical reviews with a focus on thermal barrier coatings for high-temperature applications.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Mechanical properties of ceramic coatings;
  • Corrosion behavior of TBCs;
  • Failure analysis;
  • High-temperature corrosion and high-temperature protection;
  • Theoretical and computational modeling;
  • The preparation and application of TBCs;
  • Non-destructive testing technology.

Prof. Dr. Wang Zhu
Dr. Fan Zhang
Guest Editors

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

  • thermal barrier coatings (TBCs)
  • ceramic coatings
  • corrosion
  • mechanical property
  • failure analysis

Published Papers (2 papers)

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Research

23 pages, 8101 KiB  
Article
Reliability Evaluation of EB-PVD Thermal Barrier Coatings in High-Speed Rotation and Gas Thermal Shock
by Weiliang Yan, Cong Li, Zhiyuan Liu, Chunyu Cheng and Li Yang
Coatings 2024, 14(1), 136; https://doi.org/10.3390/coatings14010136 - 19 Jan 2024
Cited by 1 | Viewed by 1054
Abstract
The uncertain service life of thermal barrier coatings (TBCs) imposes constraints on their secure application. In addressing this uncertainty, this study employs the Monte Carlo simulation method for reliability evaluation, quantifying the risk of TBC peeling. For reliability evaluation, the failure mode needs [...] Read more.
The uncertain service life of thermal barrier coatings (TBCs) imposes constraints on their secure application. In addressing this uncertainty, this study employs the Monte Carlo simulation method for reliability evaluation, quantifying the risk of TBC peeling. For reliability evaluation, the failure mode needs to be studied to determine failure criteria. The failure mode of high-speed rotating TBCs under gas thermal shock was studied by combining fluid dynamics simulations and experiments. Based on the main failure mode, the corresponding failure criterion was established using the energy release rate, and its limit state equation was derived. After considering the dispersion of parameters, the reliability of TBCs was quantitatively evaluated using failure probability and sensitivity analysis methods. The results show that the main mode is the fracture of the ceramic layer itself, exhibiting a distinctive top-down “step-like” thinning and peeling morphology. The centrifugal force emerges as the main driving force for this failure mode. The failure probability value on the top side of the blade is higher, signifying that coating failure is more likely at this location, aligning with the experimental findings. The key parameters influencing the reliability of TBCs are rotation speed, temperature, and the thermal expansion coefficient. This study offers a valuable strategy for the secure and reliable application of TBCs on aeroengine turbine blades. Full article
(This article belongs to the Special Issue Preparation and Failure Mechanism of Thermal Barrier Coatings)
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12 pages, 4474 KiB  
Article
Failure Mechanism of EB-PVD Thermal Barrier Coatings under the Synergistic Effect of Thermal Shock and CMAS Corrosion
by Xiaopeng Hu, Guolin Liu, Qing Liu, Wang Zhu, Sai Liu and Zengsheng Ma
Coatings 2022, 12(9), 1290; https://doi.org/10.3390/coatings12091290 - 2 Sep 2022
Cited by 6 | Viewed by 1867
Abstract
Thermal barrier coatings (TBCs) suffer from the thermo-chemo-mechanical coupling action of thermal shock and calcium–magnesium–alumina–silicate (CMAS) corrosion. However, the failure mechanism of TBCs under the synergistic effect of thermal shock and CMAS corrosion is still unclear due to a lack of an environmental [...] Read more.
Thermal barrier coatings (TBCs) suffer from the thermo-chemo-mechanical coupling action of thermal shock and calcium–magnesium–alumina–silicate (CMAS) corrosion. However, the failure mechanism of TBCs under the synergistic effect of thermal shock and CMAS corrosion is still unclear due to a lack of an environmental simulator. Herein, an 8YSZ ceramic coating is deposited on a PtAl bond coating/DD419 nickel-based single crystal superalloy substrate using the electron beam physical vapor deposition (EB-PVD) method. The thermo-chemo-mechanical coupling effect of TBCs is achieved in a self-developed environmental simulator. The interaction of volume expansion induced by the phase transition of ZrO2, structural degradation and thermal fatigue further increases the out-of-plane tensile stress and in-plane shear stress in the ceramic coating, which accelerates the initiation and propagation of surface vertical cracks and horizontal cracks. As multiple surface vertical cracks propagate to the interface and merge with interfacial cracks, the ceramic coating spalls from the substrate. Full article
(This article belongs to the Special Issue Preparation and Failure Mechanism of Thermal Barrier Coatings)
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