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一、前言热气机的热源可来自高能量密度的金属锂和氧化剂-六氟化硫反应:8Li+SF_6=6LiF+Li_2S。由于工作温度为800～900℃,反应器外壳和热交换器都可能遭受反应物和产物的侵蚀。为此,进行了高温SF_6对材料腐蚀的研究。SF_6在400℃以上可能与器壁材料中的Fe、Cr和Ni等元素反应。我们曾对五种镍基合金进行了研究,本文就几种不锈钢和耐热合金在700～850℃温度范围内的腐蚀动力学、腐蚀产物类型和形态以及显微组织特征等作简要报导。
I. INTRODUCTION The heat source of a heat engine can come from a high energy density lithium metal and an oxidizer - sulfur hexafluoride: 8Li + SF_6 = 6LiF + Li_2S. Due to the operating temperature of 800-900 ° C, both the reactor shell and the heat exchanger may be subject to attack by reactants and products. To this end, the study of the corrosion of materials by high temperature SF_6 was carried out. SF_6 above 400 ℃ may react with Fe, Cr and Ni in the wall materials. We have studied five kinds of nickel-based alloys. In this paper, we briefly report the corrosion kinetics, the type and morphology of corrosion products and the microstructure of several stainless steels and heat-resistant alloys in the temperature range from 700 to 850 ℃.