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Changes of microstructure and mechanical properties of Hi-Nicalon Type-S SiC composites irradiated to 100 dpa

100dpaまで照射したHi-Nicalon Type-S SiC複合材料の微細組織及び強度特性変化

小沢 和巳; 小柳 孝彰*; 野澤 貴史; 加藤 雄大*; 近藤 創介*; 谷川 博康; Snead, L. L.*

Ozawa, Kazumi; Koyanagi, Takaaki*; Nozawa, Takashi; Kato, Yutai*; Kondo, Sosuke*; Tanigawa, Hiroyasu; Snead, L. L.*

炭化ケイ素繊維強化炭化ケイ素マトリックス基(SiC/SiC)複合材料は核融合DEMOブランケットの候補材料である。本研究では、(1)Hi-Nicalon Type-S(HNLS)繊維を用いた複合材料の形状安定性、(2)熱分解炭素/SiC多層被覆界面の機能、(3)SiC/SiC複合材料のR&Dのフィードバックとして、HNLS複合材料の劣化メカニズムの解明に主眼を置き、高線量照射実験を実施した。供試材は化学気相浸透法にて形成された平織りHNLS複合材料である。中性子照射試験はORNLのHFIRにて実施され、損傷量は、~1.0$$times$$10$$^{26}$$n/m$$^{2}$$ (E$$>$$0.1MeV, ~100dpaに相当)、照射温度は300, 500, and 800$$^{circ}$$Cである。照射後試験として、四点曲げ試験、SEMによる破面観察、TEMによる組織観察の結果を報告した。

A silicon carbide fiber-reinforced silicon carbide matrix (SiC/SiC) composite is a promising candidate material for an advanced fusion DEMO blanket. High-dose irradiation experiments were performed with our special focuses on understanding; (1) integrity of the Hi-Nicalon Type-S (HNLS) composites, (2) functionality of thin pyrocarbon (PyC) /SiC multilayer, and (3) clarifying the mechanism underlying degradation, as feedback to R&D on SiC/SiC composites. The materials used in this study were plain-weave HNLS composites produced via the chemical vapor infiltration process. Neutron irradiation was conducted in the HFIR at ORNL. The peak neutron fluence was ~1.0$$times$$10$$^{26}$$ n/m$$^{2}$$ (E $$>$$ 0.1 MeV, equivalent to ~100 dpa) at nominal irradiation temperatures of 300, 500, and 800$$^{circ}$$C. Results of post irradiation experiments including 1/4-four-point flexural tests, SEM, and TEM observation were reported.

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