EB-Mo, Wの核融合炉適用シミュレーション高熱負荷試験

概要

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High heat load tests of newly developed electron-beam-melted Mo and W (EB-Mo and EB-W) have been carried out to examine whether these Mo and W are applicable as the candidates of the plasma facing materials in a nuclear fusion reactor. The materials used were single crystal and wrought one of EB-Mo and W and also sintered P/M-Mo and W. The apparatuses used were H+ plasma beam stands in JAERI and NIFS, and an electron beam stand in JAERI. The heat loads tested were 150-1000MW/m2 for 5∼250msec.The test pieces of these materials irradiated were observed by using an optical microscope and a SEM to examine their macro-and micro-structure.It was found that single crystals of EB-Mo and W have little effects of high heat load on their structure except for their surface thin layer. It seemed that the irradiated surfaces were melted slightly, but the changes of the microstructure were not recognized from their macro-and micro-structures of cross section.The irradiated regions of the wrought EB-Mo and W were recrystallized as similar to those of P/M-Mo and W. It seemed that the crystal grain becomes coarse as compared with those of P/M-Mo and W. These phenomena will be explained by the fact that EB-Mo and W used are highly purified and therefore their recrystallized temperatures become low.As the results, it can be considered that single crystals of EB-Mo and W are applicable as the candidates of the plasma facing materials.
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