Thermal shock behavior of SiC coatings for fusion reactor applications.

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概要

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• Graphite substrate ISEM-3 whose thermal expansion coefficient is close to that of SiC and graphite substrate AXF-5Q1 whose thermal expansion coefficient is larger than that of SiC were coated with 50-200 pm thick CVD-SiC. On the AXF-5Q1 graphite substrate SiC could not be completely coated. Additionally HSC-SiC, which has SiC conversion layer of 800 pm thickness and whose thermal expansion coefficient of the graphite substrate is close to that of SiC, was also tested. Thermal shock test was carried out by electron beam of accelerating voltage of 10 kV, beam current of 50-200 mA, beam diameter of about 10 mmφ and heating time of a single pulse of 30 s. Crack was not observed on the CVD-SiC coating on the ISEM-3 graphite even at 200 mA (about 2.5 kW/cm<SUP>2</SUP>) and hole of about 1 mm in diameter was observed and the graphite substrate was revealed. Additionally for thermal cycle test (1, 000 times, Δ<I>T</I>=950°C), the crack or spalling was not observed on the CVD-SiC coating. It was found that for the HSC-SiC the hole was only observed with the single pulse of 200 mA and the crack was not observed. Thus the HSC-SiC also may be a candidate as the first wall of the fusion reactors.

• 一般社団法人 日本原子力学会の論文

著者

• ISEKI Takayoshi

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

• SUZUKI Hiroshige

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

• ISHIDA Masatoshi

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

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