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徳永 知倫*; 渡辺 英雄*; 吉田 直亮*; 長坂 琢也*; 笠田 竜太*; Lee, Y.-J.*; 木村 晃彦*; 時谷 政行*; 光原 昌寿*; 檜木 達也*; et al.
Journal of Nuclear Materials, 442(1-3), p.S287 - S291, 2013/11
被引用回数：11 パーセンタイル：64.2(Materials Science, Multidisciplinary)VPS-W coating formed on F82H kept at about 873K in conventional plasma spray conditions has inhomogeneous texture; namely mixture of disarranged area composed of large re-solidified/un-melted grains, fine randomly oriented grains and pores, and well ordered area composed columnar grains. Heat load test indicate that elimination of the disarranged area is necessary to improve the heat load resistance of VPS-W. One can get W coating with texture of homogeneous columnar crystal grains by eliminating the re-solidified/un-melted large particles. Optimization of the W powder size was also effective to reduce number of randomly oriented fine grains and pores.
徳永 知倫*; 渡辺 英雄*; 吉田 直亮*; 長坂 琢也*; 笠田 竜太*; 江里 幸一郎; 鈴木 哲; 秋場 真人
no journal, ,
Coating by vacuum plasma splay W (VPS-W) is one of a promising method to protect plasma facing components from the serious heat load and plasma bombardment. However, physical properties of VPS-W on F82H reported so far is not good enough for fusion application due to its rather porous structure. Present work showed that formation of epitaxially grown columnar grain structure is essential to get dense coating with higher heat diffusivity. In case of W splay on F82H, which must be kept at lower temperatures under the coating, rather large W powders removed smaller ones is very effective to form uniform columnar texture.
