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Advances in Environmental Barrier Coatings/Ceramic Matrix Composites
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Advances in Environmental Barrier Coatings/Ceramic Matrix Composites

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 (25 December 2023) | Viewed by 3957

Special Issue Editor

Dr. Guangwu Fang

E-Mail Website
Guest Editor
College of General Aviation and Flight, Nanjing University of Aeronautics and Astronautics, Nanjing 210000, China
Interests: fatigue and fracture of composite; ceramic matrix composite; environmental barrier coatings; multiscale modelling; numerical simulation

Special Issue Information

Dear Colleagues,

Ceramic matrix composites (CMC) are now materials of choice for hot section components of aeroengine and space vehicles. These components undergo very harsh operating environmental conditions. CMCs are capable of operating at high temperatures up to 1500 °C. However, they undergo a degradation process when subjected to water vapor volatilization, accelerated oxidation, severe corrosion, and erosion. Environmental barrier coatings (EBCs) have substantially progressed as an integral design element. This leads to various issues related to components’ material strength limitations, degradation, cracking, and other durability problems. In general, the microstructure plays an important role in the performance of CMCs and apparently has a significant effect on the behavior of the EBCs deposited on the composites.

This Special Issue aims to summarize the modeling and analytical techniques for CMC/EBCs and highlight the future prospective of CMC/EBC studies via experimental and numerical methods. In this Special Issue, original research articles and reviews are welcome. Research areas may include (but not be limited to) the following:

  • Failure mechanism of CMC/EBCs;
  • Monitoring of damage in CMC/EBCs;
  • Analysis of thermal stress and heat transfer in CMC/EBCs;
  • Simulation of crack initiation and propagation in CMC/EBCs;
  • Life prediction under thermal shock/cycling in CMC/EBCs;
  • Modeling of water vapor volatilization and oxidation in CMC/EBCs.

We look forward to receiving your contributions.

Dr. Guangwu Fang
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

  • environmental barrier coatings
  • ceramic matrix composite
  • failure mechanism
  • numerical modeling
  • damage evolution
  • finite element method
  • thermal grown oxide
  • crack propagation
  • thermal stress

Published Papers (2 papers)

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Research

14 pages, 5737 KiB  
Article
Mitigating CMAS Attack in Model YAlO3 Environmental Barrier Coatings: Effect of YAlO3 Crystal Orientation on Apatite Nucleation
by Amanda Velázquez Plaza and Amanda R. Krause
Coatings 2022, 12(10), 1604; https://doi.org/10.3390/coatings12101604 - 21 Oct 2022
Cited by 2 | Viewed by 2099
Abstract
Environmental barrier coatings (EBCs) are used to protect ceramic-matrix composites from undesirable reactions with steam and calcia–magnesia–alumina–silicate (CMAS) particulates found in gas-turbine engine environments. Effective EBCs contain yttria or rare earth ions that will react with molten CMAS to form a protective apatite [...] Read more.
Environmental barrier coatings (EBCs) are used to protect ceramic-matrix composites from undesirable reactions with steam and calcia–magnesia–alumina–silicate (CMAS) particulates found in gas-turbine engine environments. Effective EBCs contain yttria or rare earth ions that will react with molten CMAS to form a protective apatite layer that prevents further attack. Methods to improve the EBCs’ CMAS mitigation capabilities focus on improving the apatite yield but neglect optimizing the apatite formation behavior. This study investigates the effect of apatite nucleation behavior on CMAS penetration by comparing the CMAS attack at 1350 °C of four different single crystal orientations of yttria aluminate perovskite (YAP), a promising EBC candidate. The EBC/CMAS interfacial energy and, thus, reaction behavior varies with YAP orientation. In regions with low CMAS loading, rapid apatite growth is seen on YAP substrates with orientations associated with high EBC/CMAS interfacial energy. However, CMAS penetration is most significant in these samples because the apatite growth is facilitated by recession of the YAP substrate nearby. Such behavior is not observed in regions with high CMAS loading where small apatite crystals form on top of an yttrium aluminate garnet (Y3Al5O12, YAG) phase. This study shows that strategies that control the nucleation and growth of apatite will provide better protection against CMAS. Full article
(This article belongs to the Special Issue Advances in Environmental Barrier Coatings/Ceramic Matrix Composites)
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29 pages, 10045 KiB  
Article
Crack Driving Forces of Atmospheric Plasma-Sprayed Thermal Barrier Coatings
by Bochun Zhang, Kuiying Chen and Natalie Baddour
Coatings 2022, 12(8), 1069; https://doi.org/10.3390/coatings12081069 - 29 Jul 2022
Viewed by 1255
Abstract
High-temperature operation service conditions can be used to evaluate the durability of Atmospheric Plasma-Sprayed Thermal Barrier Coating systems (APS-TBCs). To evaluate the durability of TBCs within their life span, two different thermal cycling testing results, i.e., isothermal furnace cycling and burner rig cycling [...] Read more.
High-temperature operation service conditions can be used to evaluate the durability of Atmospheric Plasma-Sprayed Thermal Barrier Coating systems (APS-TBCs). To evaluate the durability of TBCs within their life span, two different thermal cycling testing results, i.e., isothermal furnace cycling and burner rig cycling tests, are utilized to numerically investigate possible crack driving forces that might lead to the failure of TBCs. Although there are many studies on failure and life prediction, there is still a lack of quantitative evaluation and comparison on the crack driving forces under these two different thermal cycling schemes. In this paper, by using modified analytical models, strain energy release rates (ERRs) are estimated and compared between these two testing approaches using experimental data. A new residual stress model was developed to study the position where the maximum residual stress occurs due to coefficient of thermal expansion (CTE) mismatch at different thermally grown oxide (TGO) thicknesses. The main crack driving forces are identified for two types of thermal cycling. A possible cracking route is found based on the calculated equivalent ERRs with respect to distance from the interface between the topcoat (TC)/TGO layers. The relationship between crack driving force of isothermal furnace and burner cycling tests is also elaborated. Full article
(This article belongs to the Special Issue Advances in Environmental Barrier Coatings/Ceramic Matrix Composites)
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