ウエダ　ヨシオ   Ueda Yoshio   上田　良夫    所属   追手門学院大学  理工学部 電気電子工学科    職種   教授
言語種別	英語
発行・発表の年月	2006/02
形態種別	論文
査読	査読あり
標題	Critical heat flux loading experiments on CVD-W coating in the TEXTOR tokamak
執筆形態	共著・編著（代表編著を除く）
掲載誌名	FUSION ENGINEERING AND DESIGN
掲載区分	国外
出版社・発行元	ELSEVIER SCIENCE SA
巻・号・頁	81(1-7),pp.175-180
国際共著	国際共著
著者・共著者	T Hirai,A Kreter,J Linke,J Malzbender,T Ohgo,Philipps, V,G Pintsuk,A Pospieszczyk,Y Sakawa,G Sergienko,T Tanabe,Y Ueda,M Wada
概要	A copper block coated with 0.2 mm layer of CVD-W was exposed to high heat fluxes in the edge plasma of the TEXTOR tokamak. The coating showed good performance in general, however, the coating was destroyed during the critical heat flux loading at an estimated peak power density of 28 MW/m(2). This destruction process was first initiated by the cracking of the CVD-W layer due to the large difference in thermal expansion between W and Cu. Molten Cu emerged through the cracks leaving cavities beneath the CVD-W layer. The formed cavities reduced the heat conduction from the CVD-W layer to the Cu block, and the CVD-W layer was damaged further due to the overheating during plasma loads. To avoid this coating failure, it is necessary to keep the temperature at the interface reasonably low and to release thermal stresses by castellation and/or adopting a functionally graded interlayer. (c) 2005 Elsevier B.V. All rights reserved.
DOI	10.1016/j.fusengdes.2005.08.053
ISSN	0920-3796