熔盐堆用镍基合金失效机理与改性策略研究进展

王优, 陈向阳, 王煦嘉, 汤春桃, 沈朝, 曾小勤

Progress in Failure Mechanisms and Modification Strategies of Nickel-Based Alloys for Molten Salt Reactors

WANG You, CHEN Xiangyang, WANG Xujia, TANG Chuntao, SHEN Zhao, ZENG Xiaoqin

表1 常见活性元素与熔盐组分的化学反应及700 ℃下反应的Gibbs自由能变化(ΔG)汇总[10]

Table 1 Summary of chemical reactions between common active elements and molten salt components and Gibbs free energy changes (ΔG) for reactions at 700 oC[10]

Element Reaction Reaction product ΔG / (kJ·mol-1) Mo Mo + 3HF(l) = MoF3 + 1.5H2(g) MoF3 -27.288 Ni Ni + 2HF(l) = NiF2 + H2(g) NiF2 -64.334 Fe Fe + 3HF(l) = FeF3 + 1.5H2(g) FeF3 -127.298 Fe + 2HF(l) = FeF2 + H2(g) FeF2 -131.981 Cr Cr + 2HF(l) = CrF2 + H2(g) CrF2 -211.982 Cr + 3HF(l) = CrF3 + 1.5H2(g) CrF3 -277.105 Mn Mn + 2HF(l) = MnF2 + H2(g) MnF2 -279.745 Nb Nb + 5HF(l) = NbF5 + 2.5H2(g) NbF5 -377.160