Deuterium permeation behavior and its iron-ion irradiation effect in yttrium oxide coating deposited by magnetron sputtering

被引：16

作者：

Chikada, Takumi ^{[1
]}

Fujita, Hikari ^{[1
]}

Engels, Jan ^{[2
]}

Houben, Anne ^{[2
]}

Mochizuki, Jumpei ^{[1
]}

Horikoshi, Seira ^{[1
]}

Matsunaga, Moeki ^{[1
]}

Tokitani, Masayuki ^{[3
]}

Hishinuma, Yoshimitsu ^{[3
]}

Kondo, Sosuke ^{[4
]}

Yabuuchi, Kiyohiro ^{[4
]}

Schwarz-Selinger, Thomas ^{[5
]}

Terai, Takayuki ^{[6
]}

Oya, Yasuhisa ^{[1
]}

机构：

[1] Shizuoka Univ, Suruga Ku, 836 Ohya, Shizuoka 4228529, Japan

[2] Forschungszentrum Julich, TEC, D-52428 Julich, Germany

[3] Natl Inst Fus Sci, 322-6 Oroshi, Toki, Gifu 5095292, Japan

[4] Kyoto Univ, Uji, Kyoto 6110011, Japan

[5] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[6] Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2018年 / 511卷

关键词：

Tritium; Permeation; Coating; Irradiation; Yttrium oxide; METAL-ORGANIC DECOMPOSITION; MICROSTRUCTURE; DEMO;

D O I：

10.1016/j.jnucmat.2018.06.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tritium permeation through structural materials is a critical issue in fusion reactors from the viewpoints of sufficient fuel balance and radiological hazard. Ceramic coatings have been investigated as tritium permeation barrier for several decades; however, irradiation effects of the coatings on permeation are not elucidated. In this work, yttrium oxide coatings were fabricated on reduced activation ferritic/martensitic steels by radio frequency magnetron sputtering, and their microstructures and deuterium permeation behaviors were investigated before and after iron-ion irradiation at different temperatures. An as-deposited coating had a columnar structure and transformed into a granular one after annealing. An amorphous layer formed near the coating-substrate interface of irradiated coatings, and its thickness became thinner with increasing irradiation temperature. Voids of approximately 20 nm in diameter also formed in the irradiated coatings. Deuterium permeation flux of the sample irradiated to 1 dpa at room temperature was the lowest among the unirradiated and irradiated samples, and a permeation reduction factor indicated up to 390. The amorphous layer disappeared after deuterium permeation measurements due to damage recovery, while the voids remained and aggregated. The irradiation damage would accelerate nucleation of the crystal, resulting in a decrease of the permeation flux. (c) 2018 Elsevier B.V. All rights reserved.

引用

页码：560 / 566

页数：7

共 17 条

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