Corrosion behavior of ZrC-SiC composite ceramics in LiF-NaF-KF molten salt at high temperatures

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• 作者：Yang Wang^a ; Zhong-Feng Tang^a ; ^{tangzhongfeng@sinap.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yuan Fu^a ; Shi-Rong Huang^b ; ^{hwangee@163.com" class="auth_mail" title="E-mail the corresponding author} ; Su-Fang Zhao^a ; Peng Zhang^a ; Lei-Dong Xie^a ; Xin-Gang Wang^c ; ^{xgwang@mail.sic.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Guo-Jun Zhang^c
• 关键词：C. Corrosion ; Silicon carbide ; Zirconium carbide ; Molten FLiNaK salts ; Micromorphology
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：12996-13005
• 全文大小：3021 K

文摘

The suitability of ZrC–SiC-based ceramics was assessed as candidate materials for fluoride. An immersion corrosion with ZrC–SiC composites was performed in molten FLiNaK salts (LiF–NaF–KF: 46.5/11.5/42 mol%) at 850 °C. Results indicated that ZrC–SiC-based ceramics were more corrosion resistant than the ZrC ceramic. ZrC–40SiC ceramic exhibited 50% weight-loss to ZrC. This carbide exhibited minimal corrosion attack because of strong resistance to dissolution in molten fluorides. Furthermore, XRD results were consistent with weight-loss and SEM results. The corrosion behavior of ZrC–SiC-based ceramics was affected by impurities, particularly oxygen content. Oxygen and/or oxygen ion participated in corrosion of ceramic. Corrosion of carbide ceramics is mainly due to C⁴⁻ in ceramics. This ion is oxidized to elemental C by oxidants or impurities in the molten salt. The addition of C may inhibit corrosion of molten salts and thus improve the corrosion resistance of carbide ceramics.