Interfacial structure and physical properties of high-entropy oxide coatings prepared via atmospheric plasma spraying

Tae Sung Park; Nana Kwabena Adomako; Andrews Nsiah Ashong; Young Kuk Kim; Seung Min Yang; Jeoung Han Kim

doi:10.3390/coatings11070755

Interfacial structure and physical properties of high-entropy oxide coatings prepared via atmospheric plasma spraying

Tae Sung Park, Nana Kwabena Adomako, Andrews Nsiah Ashong, Young Kuk Kim, Seung Min Yang, Jeoung Han Kim

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol % yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.

Original language	English
Article number	755
Journal	Coatings
Volume	11
Issue number	7
DOIs	https://doi.org/10.3390/coatings11070755
State	Published - Jul 2021
Externally published	Yes

Funding

Funding: This study was financially supported by Hanbat National University Financial Accounting Research Fund, 2019 academic year.

Keywords

8YSZ
High-entropy oxide
Rare-earth oxide
Thermal barrier coating

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title = "Interfacial structure and physical properties of high-entropy oxide coatings prepared via atmospheric plasma spraying",

abstract = "The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol \% yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.",

keywords = "8YSZ, High-entropy oxide, Rare-earth oxide, Thermal barrier coating",

author = "Park, \{Tae Sung\} and Adomako, \{Nana Kwabena\} and Ashong, \{Andrews Nsiah\} and Kim, \{Young Kuk\} and Yang, \{Seung Min\} and Kim, \{Jeoung Han\}",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = jul,

doi = "10.3390/coatings11070755",

language = "English",

volume = "11",

journal = "Coatings",

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T1 - Interfacial structure and physical properties of high-entropy oxide coatings prepared via atmospheric plasma spraying

AU - Park, Tae Sung

AU - Adomako, Nana Kwabena

AU - Ashong, Andrews Nsiah

AU - Kim, Young Kuk

AU - Yang, Seung Min

AU - Kim, Jeoung Han

PY - 2021/7

Y1 - 2021/7

N2 - The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol % yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.

AB - The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol % yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.

KW - 8YSZ

KW - High-entropy oxide

KW - Rare-earth oxide

KW - Thermal barrier coating

UR - https://www.scopus.com/pages/publications/85109260583

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DO - 10.3390/coatings11070755

M3 - Article

AN - SCOPUS:85109260583

SN - 2079-6412

VL - 11

JO - Coatings

JF - Coatings

IS - 7

M1 - 755

ER -

Interfacial structure and physical properties of high-entropy oxide coatings prepared via atmospheric plasma spraying

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Keywords

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