Conference Proceedings Paper
CORROSION BEHAVIOUR OF POROUS CHROMIUM CARBIDE/OXIDE BASED CERAMICS IN SUPERCRITICAL WATER
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Ziqiang Dong (University of Alberta)
Tingyong Xin (University of Alberta)
Weixing Chen (University of Alberta)
Wenyue Zheng (Natural Resources Canada)
David Guzonas (Atomic Energy of Canada Limited)
Porous chromium carbide with a high density of open pores was fabricated by a reactive sintering method. Chromium oxide ceramics were obtained by re-oxidizing the porous chromium carbides formed. Some samples were added with yttria at 5 wt. %, prior to reactive sintering to form porous structures. Corrosion tests in SCW were performed at temperatures ranging from 375°C to 625°C with a fixed pressure at around 25~30 MPa. The results show that chromium carbide is stable in SCW environments at temperatures up to 425°C, above which disintegration of carbides through oxidation occurs. Porous chromium oxide samples show better corrosion resistance than porous chromium carbide, but disintegrate in SCW at around 625°C. Among all the samples tested, chromium oxide ceramics with added yttria exhibited much better corrosion resistance compared with the pure chromium carbide/oxides. No evidence of weight change or disintegration of porous chromium oxides with 5 wt % added yttria was observed after exposure at 625°C in SCW for 600 hours.
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