Corrosion-resistant metallic coating on silicon carbide for use in high-temperature water

Ryo Ishibashi, Kazushige Ishida, Takao Kondo, Yutaka Watanabe

研究成果: Article査読

抄録

To improve corrosion resistance of silicon carbide (SiC) in boiling water reactor (BWR) environments, corrosion-resistant coatings on SiC substrate are being developed. A metallic Ti coating with a Cr bonding layer is known to provide corrosion resistance in high-purity water with a dissolved oxygen concentration of 8.0 mg/l at 561 K, which is a simulated BWR-normal water chemistry (NWC) environment. In this paper, the mechanism of corrosion resistance was examined by evaluating the effects of heat treatment in the coating process on adhesive property and corrosion behavior in oxygenated high-purity water at high temperatures under unirradiated conditions. The Cr bonding layer was considered to contribute to lessening of thermal stress generated in the coating on the SiC substrate and to forming a rigid interface between Cr and SiC through diffusion and formation of chromium silicide. Furthermore, excessive heat treatment caused transformation of Ti to TiC and the possibility of coating disbondment. A TiO2 film that formed on Ti surface was insoluble and this characteristic differed from Cr2O3, CrOOH and SiO2 which were soluble in the BWR-NWC environment under the unirradiated condition. Thus, the TiO2 film coat was expected to provide corrosion resistance.

本文言語English
論文番号153214
ジャーナルJournal of Nuclear Materials
557
DOI
出版ステータスPublished - 2021 12 15

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 材料科学(全般)
  • 原子力エネルギーおよび原子力工学

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