摘要
为开发氟化物熔盐传热蓄热载体材料,将NbN、VC、WB和MoC陶瓷浸渍在850℃的LiF-NaF-KF熔盐中100h,采用理论计算、腐蚀率及扫描电镜等技术对材料腐蚀行为进行研究。研究发现,陶瓷材料耐氟化物熔盐腐蚀能力可根据其与F2(g)反应的△G来判断,其中△G值越大,材料耐腐蚀性能强。陶瓷材料耐熔盐腐蚀性依次为MoC>VC>NbN>WB,其腐蚀机理主要是陶瓷与分解产生的小分子发生氟化反应。MoC腐蚀率最小仅为0.26um,其作为高温氟化物熔盐载体材料有望获得广泛应用。
In order to develop fluoride molten salt carried materials, ceramics materials （NbN, VC, WB and MoC） were immerged in LiF-NaF-KF molten salt under 850℃ for 100h. Corrosion behaviors of ceramics were characterized by theoretical calculation, corrosion rate and SEM. Ceramics＇ corrosion resistance generally correlated with the free energy （△G） of ceramics reacted with fluorine was found. The resistance of corrosion increased with increasing/XG. The corrosion resistance was MoC〉VC〉NbN〉WB, and the corrosion rate was mainly attributed to fluoridation of ceramics with small molecular by decomposition. MoC exhibited best corrosion resistant performance with corrosion rate about 0. 26um. Further study with MoC was worthy.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第3期111-113,117,共4页
New Chemical Materials
基金
中国科学院战略性先导科技专项(A类)-未来先进核裂变能-钍基熔盐核能系统(XDA02000000)
关键词
氟化物熔盐
陶瓷材料
腐蚀行为
微观形貌
molten fluoride salt, ceramics material, corrosion behavior, micro-morphology
