Application of chemical interaction between (Fe, Cr) oxides and Mo oxide at high temperature for self-healing intelligence on nuclear fuel cladding in LWRs. Issue 12 (2nd December 2018)

• Record Type: Journal Article
• Authors: Duan, Zhengang; Yang, Huilong; Kano, Sho; McGrady, John; Abe, Hiroaki
• Is Part Of: Journal of nuclear science and technology. Volume 55:Issue 12(2018)
• Page Start: 1402
• Page End: 1411
• Publication Date: 2018-12-02
• Subjects: Self-healing -- coating -- fuel cladding -- molybdate -- high temperature -- light water reactors (LWRs); Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2018.1512428
• Languages: English
• ISSNs: 0022-3131

Abstract

ABSTRACT: A novel scheme for a bilayer coating with self-healing ability is proposed in this study. The candidate materials for the coatings and the potential self-healing reaction are assessed in high-temperature aqueous environments and high-temperature air. The pure Cr2 O3 layer and the composite of Cr2 O3 and MoO3 are the candidate materials for the outer layer and inner layer, respectively, due to their compatibility under normal condition and fabricability. Fe2 O3 –MoO3 reactions exhibit a potential ability to heal the cracks because of a high reaction rate under normal condition. The self-healing process proceeds via the following mechanism under normal condition: Fe2 O3 (a corrosion product in the coolant) diffuses into the cracks on the coating and reacts with MoO3 (inner layer) to produce the insoluble Fe2 (MoO4 )3, which deposits and repairs the cracks. In the loss-of-coolant accident (LOCA) situation, Cr2 O3 –MoO3 reaction is expected to strengthen the adhesion of the coating.