Microstructure investigation on SiC by nano-infiltration transient eutectic process after triple ion beam bombardment

Ozawa, Kazumi; Koyanagi, Takaaki*; Taguchi, Tomitsugu; Nozawa, Takashi; Tanigawa, Hiroyasu; Kondo, Sosuke*; Hinoki, Tatsuya*

A SiC/SiC composite is a promising candidate functional/structural material for fusion DEMO reactor. To examine the effects of transmuted H mainly on microstructural cavity formation, the monolithic NITE-SiC with 6wt% Y $_{2}$ O $_{3}$ -Al $_{2}$ O $_{3}$ sintering additive system were ion-irradiated to 10 dpa at 1000 $^{circ}$ C nominally with 130 appmHe/dpa, and 40 or 400 appmH/dpa, respectively. In SiC grains, tiny cavities with 2 nm formed densely. However, it is revealed that H could not remarkably impact on cavity formation (size, density) in the condition studied. The influence of cavities formed along SiC-YAG grain boundary (GB) on cavity swelling seems to be also small, possibly attributed to its quite low density, even though the cavity size formed is three to five times larger than the size in CVI-SiC matrix in the same irradiation condition. Additional investigation of the microstructural evolution in YAG grain and SiC-YAG GB is a future plan.

Language	:	English
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Meeting title	:	Nuclear Materials Conference 2012 (NuMat 2012)
Held date	:	2012/10
Location (city)	:	Osaka
Location (country)	:	Japan
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Keywords	:	no keyword
Research Facility	:	原型炉R\&D棟
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Registration No. : BB20122303
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