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热气机的热源可选取具有高能量密度的放热反应:8Li+SF_6=6LiF+Li_2S,其反应温度控制在700～900℃之间,因此,反应器外壳,喷咀和热交换器管都可能遭到反应物和生成物的腐蚀。 SF_6是一种很稳定的气体,工业中可用作氧化剂。SF_6在400℃以上可与器壁材料中的Fe、Cr、Ni等元素反应,至今关于高温下SF_6对金属材料腐蚀的研究还未见报道。本文作者已对镍基高温合金和铁基合金作了较系统的研究,其结果表明:铁基和镍基合金在高温SF_6中都不同程度地遭到严重腐蚀,其中含铝较高的镍基合金略好些。本工作研究
The heat source of the hot air machine can choose the exothermic reaction with high energy density: 8Li + SF_6 = 6LiF + Li_2S, the reaction temperature is controlled between 700 ~ 900 ℃, therefore, the reactor shell, nozzle and heat exchanger tube may Corrosion of reactants and products. SF_6 is a very stable gas that can be used as an oxidizer in the industry. SF_6 above 400 ℃ can react with Fe, Cr, Ni and other elements in the wall material. Up to now, there is no report on the corrosion of SF_6 metal materials at high temperature. The authors have made a systematic study of nickel-based superalloys and iron-based alloys. The results show that the iron-based and nickel-based alloys suffer severe corrosion to various degrees in high-temperature SF_6, and the high content of nickel Alloy slightly better. This work is studied