The Behavior of Cr-coated Zry cladding under high-temperature steam oxidation

Crコートジルカロイ被覆管の高温水蒸気酸化挙動

Mohamad, A. B. ; 古本 健一郎; 根本 義之  ; 井岡 郁夫  ; 佐藤 大樹*; 岡田 裕史*; 山下 真一郎   ; 逢坂 正彦  

Mohamad, A. B.; Furumoto, Kenichiro; Nemoto, Yoshiyuki; Ioka, Ikuo; Sato, Daiki*; Okada, Yuji*; Yamashita, Shinichiro; Osaka, Masahiko

Chromium (Cr) coated zirconium (Zr) based alloy cladding is the promising material for a near term accident tolerant fuel (ATF). Cr-coated Zr based cladding was fabricated by sputtering technique and HT oxidation tests were conducted up to different high temperatures (1100C to 1400C). The present work aims to investigate the metallography of Cr-coated Zr cladding after HT steam test. The result showed CrO layers were formed as a protective oxide layer at the outmost layer for all samples. However, Cr-Zr-Fe phases were observed In particular, the main phases observed in the cross-sectional area were CrO, Cr, ZrO, Cr-Zr, and Zr situated from outer to inner of the sample after HT test. The details of the microstructure and mechanism of these samples will be discussed in the presentation.