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革新的高温ガス炉燃料用ZrC被覆層のTEM観察及びEELS測定

TEM observation and EELS measurement of ZrC coating layer for advanced high temperature gas cooled reactor

相原 純 ; 植田 祥平   ; 本橋 嘉信*; 沢 和弘

Aihara, Jun; Ueta, Shohei; Motohashi, Yoshinobu*; Sawa, Kazuhiro

革新的高温ガス炉用に耐熱性の高いZrC被覆燃料粒子の開発を進めている。その基礎研究として、ジルコニア核を高密度熱分解炭素で被覆した物の上にZrCを臭素法で被覆した。実際の製造工程でのコンパクト焼成の微細構造に対する影響を調べるため、約1800$$^{circ}$$Cで1時間熱処理した。C/Zr=1.35のバッチについて、熱処理前後の試料のTEM観察及び熱処理後の試料のEELS測定を行った。熱処理前には薄い層状であったボイドまたは遊離炭素領域は、熱処理後50-100nm程度の塊状になっていた。また、ZrCの結晶成長も観察された。また、熱処理後の試料の遊離炭素領域からのEELSには炭素の$$pi$$*ピークが現れていたが、ZrC領域にはなかった。これらの知見は今後の熱処理過程を改良していくのに反映する。

Development of ZrC coated fuel particles for advanced high temperature gas cooled reactors. As a basic study, the ZrC coating layer has been fabricated using the bromide process at JAEA. The coated particles were annealed at around 1800 $$^{circ}$$C for 1h, under which compact sintering will be done in a practical process, in order to study effects of the heat treatment on their microstructure evolution. Then the microstructures of the ZrC layers in the batch of C/Zr = 1.35 were characterized by means of TEM. Certain changes in the shape and size of voids or free carbons region caused by the heat treatment were found. After the heat treatment, the voids or free carbons region have changed from a thin layered feature into a clod like feature with diameters of 50 to 100 nm. In addition, EELS measurements were carried out in the heat treated specimen. The $$pi$$* peak of carbon was observed in the spectrum from free carbons or voids region, but not in the spectrum from ZrC region.

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