Authors & Affiliations
Krasin V.P., Soyustova S.I.
Moscow State University of Mechanical Engineering, Moscow, Russia
Soyustova S.I. – PhD (Phys.-Math.), Assoc. Prof., Moscow State University of Mechanical Engineering (MAMI).
Since the interest in the use of liquid lithium as breeding material and a coolant in some designs of the fusion reactor blanket is growing, it requires a more detailed study of the factors that control corrosion processes in the liquid-metal loops of such plants. It is well known the nitrogen which was dissolved in liquid lithium is the reason of the intensive corrosion of the most structural materials, and in some cases due to increased solubility of transition metals such as Fe, Cr and Nb in the alkali metal. The Li-Cr-N system attracts draw attention because of the fact that the chromium as a component of the ferritic and austenitic steels is the most reactive to the nitrogen in liquid lithium. Despite the large amount of experimental researches of the nitrogen impurity influence on the compatibility of materials containing chromium with liquid lithium, only in a small fraction of these works were determined thermodynamic characteristics of the Li-Cr-N system. This study is important from the point of view of studying the nitrogen impact on the transfer of the dissolved chromium in the loop systems. The mathematical formalism of the coordination-cluster model allowed us to get equations for calculation the temperature dependence of the chromium solubility in liquid lithium with various nitrogen content. The calculation results were compared with available experimental data describing the change in the equilibrium concentration of chromium in liquid lithium with temperature at different contents of the nitrogen in the liquid metal.
liquid lithium, breeding material, thermodynamic properties, concentration of clusters, the first coordination shell, equilibrium concentration, coordination cluster model, ternary nitride
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