Abstract
The chemical resistance of the ZrN powder to molten LiCl with additions of PbCl2, KCl, Li2O, LiOH, and H2O at 650°С have been thermodynamically evaluated and experimentally verified. Using complex physical-chemical methods it has been demonstrated that ZrN exhibits a high resistance to the LiCl-PbCl2 melts. After long-term exposure of the ZrN powder in these melts the PbCl2 concentration was not changed and the ZrCl4 content did not exceed 0.002 wt% in the melt and 0.23 wt% in the sublimates. An increase in temperature or molar ratio of PbCl2/ZrN, as well as appearance of the KCl modifying component insignificantly reduces the ZrN resistance to molten LiCl-PbCl2. According to the SEM analysis, a structure of the ZrN powder becomes less dense after the exposure in LiCl-PbCl2. Almost complete oxidation of the ZrN powder was found after long-term exposure in the LiCl-PbCl2 melts with Li2O and LiOH additions, and only partial oxidation was observed in melts with H2O addition. Nevertheless, a high resistance of the ZrN powder to the LiCl-Li2O melt was determined.
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