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Science and Technology of Thermal Barrier Coatings II
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Science and Technology of Thermal Barrier Coatings II

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 3426

Special Issue Editor

Prof. Dr. Yeon-Gil Jung

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Colleage of Mechatronics Engineering, Changwon National University, #20 Changwondaehak-ro, Uichang-gu, Changwon, Gyeongnam 641-773, Korea
Interests: material design and fabrication of advanced structural ceramics, ceramic-matrix composites, and laminated materials; development of ceramic mold and core using organic/inorganic binder system; fracture mechanics in nano- and micro-structure materials; thin film processing and surface physics; microstructure design and properties evaluation in thermal barrier coatings (TBCs); binder system and coating process for flexible battery and high ion conductivity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The operation of numerous gas turbines for aerospace and power generation relies on thermal barrier coatings (TBC), which are applied on hot components. These coatings enable hot components to be purposeful in harsh environments beyond the operational limit of the uncoated component materials, ultimately improving energy efficiency and durability. Therefore, this Special Issue of Coatings, “Science and Technology of Thermal Barrier Coatings”, is devoted to research and review articles on TBC materials studies for optimizing properties, the development of the fabrication process, characterizations, and thermal durability evaluations.

This Special Issue will provide a forum for original research, critical reviews, and perspectives in thermal barrier coatings and their applications from both academia and industry.

Topics of interest include but are not limited to the following:

  • Novel ceramic top coat and metallic bond coat materials;
  • The characterization of thermal and/or mechanical properties;
  • Novel fabrication technologies of TBC;
  • Novel methods for thermal durability evaluations.

Prof. Dr. Yeon-Gil Jung
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.

Published Papers (1 paper)

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Research

13 pages, 2726 KiB  
Article
Oxidation Behavior of NiCoCrAlY Coatings Deposited by Vacuum Plasma Spraying and High-Velocity Oxygen Fuel Processes
by Junseong Kim, Janghyeok Pyeon, Bong-Gu Kim, Tserendorj Khadaa, Hyeryang Choi, Lu Zhe, Tejesh Dube, Jing Zhang, Byung-il Yang, Yeon-gil Jung and SeungCheol Yang
Coatings 2023, 13(2), 319; https://doi.org/10.3390/coatings13020319 - 1 Feb 2023
Cited by 3 | Viewed by 2937
Abstract
To reduce the formation of detrimental complex oxides, bond coatings in the thermal barrier coatings for gas turbines are typically fabricated using vacuum plasma spraying (VPS) or the high-velocity oxygen fuel (HVOF) process. Herein, VPS and HVOF processes were applied using NiCoCrAlY + [...] Read more.
To reduce the formation of detrimental complex oxides, bond coatings in the thermal barrier coatings for gas turbines are typically fabricated using vacuum plasma spraying (VPS) or the high-velocity oxygen fuel (HVOF) process. Herein, VPS and HVOF processes were applied using NiCoCrAlY + HfSi-based powder to assess the oxidation behavior of the bond coatings for both coating processes. Each coated sample was subjected to 50 cyclic heat treatments at 950 °C for 23 h and cooling for 1 h at 20 °C with nitrogen gas, and the weight change during the heat treatment was measured to evaluate the oxidation behavior. After the oxidation test, the coating layer was analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The VPS coating exhibited faster weight gain than the HVOF coating because the alumina particles generated during the initial formation of the HVOF coating inhibited oxidation and diffusion. The VPS coating formed a dense and thick thermal growth oxide (TGO) layer until the middle of the oxidation test and remained stable until the end of the evaluation. However, the HVOF coating demonstrated rapid weight loss during the final 20 cycles. Alumina within the bond coat suppressed the diffusion of internal elements and prevented the Al from being supplied to the surface. The isolation of the Al accelerated the growth of spinel TGO due to the oxidation of Ni, Co, and Cr near the surface. The as-coated VPS coating showed higher hardness and lower interfacial bonding strength than the HVOF did. Diffusion induced by heat treatment after the furnace cyclic test (FCT) led to a similar internal hardness and bonding strengths in both coating layers. To improve the quality of the HVOF process, the densification of the coating layer, suppression of internal oxide formation, and formation of a dense and uniform alumina layer on the surface must be additionally implemented. Full article
(This article belongs to the Special Issue Science and Technology of Thermal Barrier Coatings II)
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