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Proceedings Paper

Carbon-metal brazing for divertor plates in fusion devices
Author(s): T. Matsuda; Takashi Matsumoto; Sokan Miki; T. Sogabe; M. Okada; Yoshinobu Kubota; A. Sagara; N. Noda; O. Motojima; T. Hino; T. Yamashina
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Paper Abstract

A diverter unit, which consists of carbon armors brazed to a copper cooling channel, is under development for fusion devices. Isotropic graphite (IG-430U) and CFC (CX-2002U) are used for the armor, and a copper for the cooling tube. A technique named `dissolution and deposit of base metal' was employed for brazing. The reliability of the brazed components was evaluated both by a 4-point bending test and a thermal shock test. According to the results of the 4-point bending test under the temperature ranged from RT to 800 degree(s)C in a vacuum, it was found that the strength of the brazed surface at RT was maintained up to the higher temperature, 600 degree(s)C. A high heat load test has also been performed on the brazed sample in order to find out whether the samples meet the requirement of the diverter plates of LHD. Active Cooling Teststand (ACT:NIFS) with an electron beam power of 100 kW was used. In LHD, it is presumed that the maximum heat flux is 10 MW/m2. In addition, the surface temperature of the diverter has to be kept below 1200 degree(s)C to avoid RES, by active cooling. The heat load test showed that the brazing components of CX-2002U (flat plate type CFC-Cu brazed) were stable at 1300 degree(s)C under a heat flux of 10 MW/m2, when the flow velocity of cooling water was 6 m/s. No damage nor deterioration was found at the brazed zone after the heat load test.

Paper Details

Date Published: 25 February 1993
PDF: 5 pages
Proc. SPIE 1739, High Heat Flux Engineering, (25 February 1993); doi: 10.1117/12.140492
Show Author Affiliations
T. Matsuda, Toyo Tanso Co., Ltd. (Japan)
Takashi Matsumoto, Toyo Tanso Co., Ltd. (Japan)
Sokan Miki, Toyo Tanso Co., Ltd. (Japan)
T. Sogabe, Toyo Tanso Co., Ltd. (Japan)
M. Okada, Toyo Tanso Co., Ltd. (Japan)
Yoshinobu Kubota, National Institute for Fusion Science (Japan)
A. Sagara, National Institute for Fusion Science (Japan)
N. Noda, National Institute for Fusion Science (Japan)
O. Motojima, National Institute for Fusion Science (Japan)
T. Hino, Hokkaido Univ. (Japan)
T. Yamashina, Hokkaido Univ. (Japan)


Published in SPIE Proceedings Vol. 1739:
High Heat Flux Engineering
Ali M. Khounsary, Editor(s)

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