Iron-ion irradiation effects on microstructure of yttrium oxide coating fabricated by magnetron sputtering

Kazuki Nakamura; Hikari Fujita; Jan Engels; Masayuki Tokitani; Yoshimitsu Hishinuma; Kiyohiro Yabuuchi; Sosuke Kondo; Sho Kano; Takayuki Terai; Takumi Chikada

doi:10.1016/j.fusengdes.2019.03.093

Iron-ion irradiation effects on microstructure of yttrium oxide coating fabricated by magnetron sputtering

Kazuki Nakamura, Hikari Fujita, Jan Engels, Masayuki Tokitani, Yoshimitsu Hishinuma, Kiyohiro Yabuuchi, Sosuke Kondo, Sho Kano, Takayuki Terai, Takumi Chikada

IMR - Materials Design Division

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

9 Citations (Scopus)

Abstract

Ceramic coatings have been investigated as tritium permeation barrier for several decades; however, there is little knowledge about irradiation effects on the coatings. In this study, yttrium oxide coatings were fabricated on reduced activation ferritic/martensitic steel substrates by radio frequency reactive magnetron sputtering, and their microstructures were investigated after iron-ion irradiation under various parameters with damage concentration of up to 20 displacement per atom. The formation of voids and an amorphous layer was confirmed in all the irradiated samples. In addition, it was found that irradiation-induced grain growth proceeded with damage concentration, and the increase of grain size was proportional to damage concentration. Furthermore, a layer with few voids formed between the crystallized and amorphous layers for the irradiated samples with higher incident energy or higher dose. Defect recovery and heat-driven grain growth and/or crystallization occurred for the sample irradiated at 500 °C, resulting in a larger average grain size than those irradiated at room temperature. Further consideration of irradiation effects to the coatings under fusion-relevant irradiation conditions is necessary.

Original language	English
Pages (from-to)	2031-2035
Number of pages	5
Journal	Fusion Engineering and Design
Volume	146
DOIs	https://doi.org/10.1016/j.fusengdes.2019.03.093
Publication status	Published - 2019 Sept

Keywords

Ceramics
Coating
Irradiation
Microstructure
Permeation
Tritium

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10.1016/j.fusengdes.2019.03.093

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@article{61646daac6034c9d9d4c4cc2c0dfe0a1,

title = "Iron-ion irradiation effects on microstructure of yttrium oxide coating fabricated by magnetron sputtering",

abstract = "Ceramic coatings have been investigated as tritium permeation barrier for several decades; however, there is little knowledge about irradiation effects on the coatings. In this study, yttrium oxide coatings were fabricated on reduced activation ferritic/martensitic steel substrates by radio frequency reactive magnetron sputtering, and their microstructures were investigated after iron-ion irradiation under various parameters with damage concentration of up to 20 displacement per atom. The formation of voids and an amorphous layer was confirmed in all the irradiated samples. In addition, it was found that irradiation-induced grain growth proceeded with damage concentration, and the increase of grain size was proportional to damage concentration. Furthermore, a layer with few voids formed between the crystallized and amorphous layers for the irradiated samples with higher incident energy or higher dose. Defect recovery and heat-driven grain growth and/or crystallization occurred for the sample irradiated at 500 °C, resulting in a larger average grain size than those irradiated at room temperature. Further consideration of irradiation effects to the coatings under fusion-relevant irradiation conditions is necessary.",

keywords = "Ceramics, Coating, Irradiation, Microstructure, Permeation, Tritium",

author = "Kazuki Nakamura and Hikari Fujita and Jan Engels and Masayuki Tokitani and Yoshimitsu Hishinuma and Kiyohiro Yabuuchi and Sosuke Kondo and Sho Kano and Takayuki Terai and Takumi Chikada",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number 15H05562 , the Joint Usage/Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University , the general collaboration research with National Institute for Fusion Science ( NIFS15KEMF070 ), Research Foundation for the Electrotechnology of Chubu and a collaborative research project at Nuclear Professional School, School of Engineering, The University of Tokyo . Funding Information: This work was supported by JSPS KAKENHI Grant Number 15H05562, the Joint Usage/Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University, the general collaboration research with National Institute for Fusion Science (NIFS15KEMF070), Research Foundation for the Electrotechnology of Chubu and a collaborative research project at Nuclear Professional School, School of Engineering, The University of Tokyo. Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = sep,

doi = "10.1016/j.fusengdes.2019.03.093",

language = "English",

volume = "146",

pages = "2031--2035",

journal = "Fusion Engineering and Design",

issn = "0920-3796",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Iron-ion irradiation effects on microstructure of yttrium oxide coating fabricated by magnetron sputtering

AU - Nakamura, Kazuki

AU - Fujita, Hikari

AU - Engels, Jan

AU - Tokitani, Masayuki

AU - Hishinuma, Yoshimitsu

AU - Yabuuchi, Kiyohiro

AU - Kondo, Sosuke

AU - Kano, Sho

AU - Terai, Takayuki

AU - Chikada, Takumi

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant Number 15H05562 , the Joint Usage/Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University , the general collaboration research with National Institute for Fusion Science ( NIFS15KEMF070 ), Research Foundation for the Electrotechnology of Chubu and a collaborative research project at Nuclear Professional School, School of Engineering, The University of Tokyo . Funding Information: This work was supported by JSPS KAKENHI Grant Number 15H05562, the Joint Usage/Research Program on Zero-Emission Energy Research, Institute of Advanced Energy, Kyoto University, the general collaboration research with National Institute for Fusion Science (NIFS15KEMF070), Research Foundation for the Electrotechnology of Chubu and a collaborative research project at Nuclear Professional School, School of Engineering, The University of Tokyo. Publisher Copyright: © 2019

PY - 2019/9

Y1 - 2019/9

N2 - Ceramic coatings have been investigated as tritium permeation barrier for several decades; however, there is little knowledge about irradiation effects on the coatings. In this study, yttrium oxide coatings were fabricated on reduced activation ferritic/martensitic steel substrates by radio frequency reactive magnetron sputtering, and their microstructures were investigated after iron-ion irradiation under various parameters with damage concentration of up to 20 displacement per atom. The formation of voids and an amorphous layer was confirmed in all the irradiated samples. In addition, it was found that irradiation-induced grain growth proceeded with damage concentration, and the increase of grain size was proportional to damage concentration. Furthermore, a layer with few voids formed between the crystallized and amorphous layers for the irradiated samples with higher incident energy or higher dose. Defect recovery and heat-driven grain growth and/or crystallization occurred for the sample irradiated at 500 °C, resulting in a larger average grain size than those irradiated at room temperature. Further consideration of irradiation effects to the coatings under fusion-relevant irradiation conditions is necessary.

AB - Ceramic coatings have been investigated as tritium permeation barrier for several decades; however, there is little knowledge about irradiation effects on the coatings. In this study, yttrium oxide coatings were fabricated on reduced activation ferritic/martensitic steel substrates by radio frequency reactive magnetron sputtering, and their microstructures were investigated after iron-ion irradiation under various parameters with damage concentration of up to 20 displacement per atom. The formation of voids and an amorphous layer was confirmed in all the irradiated samples. In addition, it was found that irradiation-induced grain growth proceeded with damage concentration, and the increase of grain size was proportional to damage concentration. Furthermore, a layer with few voids formed between the crystallized and amorphous layers for the irradiated samples with higher incident energy or higher dose. Defect recovery and heat-driven grain growth and/or crystallization occurred for the sample irradiated at 500 °C, resulting in a larger average grain size than those irradiated at room temperature. Further consideration of irradiation effects to the coatings under fusion-relevant irradiation conditions is necessary.

KW - Ceramics

KW - Coating

KW - Irradiation

KW - Microstructure

KW - Permeation

KW - Tritium

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DO - 10.1016/j.fusengdes.2019.03.093

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AN - SCOPUS:85063694382

SN - 0920-3796

VL - 146

SP - 2031

EP - 2035

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

Iron-ion irradiation effects on microstructure of yttrium oxide coating fabricated by magnetron sputtering

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Keywords

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