Abstract
The behavior of potential ceramic materials (electrolytes conducting on oxygen ions) of electrochemical control devices of technological operations in oxide-halide melts was investigated. Based on the literature data and thermodynamic estimates for long-term tests in the LiCl, LiCl-Li2O and LiCl-Li2O-Li melts at a temperature of 650 ° C, mixtures of oxides ZrO2-Y2O3 (YSZ), ZrO2-Sc2O3 (ScSZ), ZrO2-CaO (CaSZ) and CeO2-Gd2O3 (CGO) were selected. These melt under the studies are the most widely used in a number of high-temperature electrochemical processes of obtaining metals and alloys, as well as in the developed schemes of pyrochemical processing of nuclear fuel. The stability of the samples was determined by changes in mass, appearance, elemental analysis of the melt, as well as via the scanning electron microscopy. The best stability in LiCl-Li2O melts was shown by the samples of ZrO2-Y2O3 with cubic and tetragonal structures and the samples of ZrO2-CaO. Based on the changes in the microstructure of the samples, it was concluded that the increase in the content of Li2O in the LiCl-Li2O melt accelerates the destruction of the sample mainly by the mechanism of dyeing, and the presence of lithium leads to loosening of the samples.
Highlights
The behavior of potential ceramic materials of electrochemical control devices of technological operations in oxide-halide melts was investigated
Based on the literature data and thermodynamic estimates for long-term tests in the LiCl, LiCl-Li2O and LiCl-Li2O-Li melts at a temperature of 650 ° C, mixtures of oxides ZrO2Y2O3 (YSZ), ZrO2-Sc2O3 (ScSZ), ZrO2-CaO (CaSZ) and CeO2-Gd2O3 (CGO) were selected. These melt under the studies are the most widely used in a number of high-temperature electrochemical processes of obtaining metals and alloys, as well as in the developed schemes of pyrochemical processing of nuclear fuel
Oxide-halide melts are widely used in a number of high-temperature electrochemical processes of obtaining metals and alloys [1,2,3], as well as in the developed schemes of pyrochemical processing of nuclear fuel [4,5]
Summary
Oxide-halide melts are widely used in a number of high-temperature electrochemical processes of obtaining metals and alloys [1,2,3], as well as in the developed schemes of pyrochemical processing of nuclear fuel [4,5]. Due to numerous physical and chemical measurements, the regularities of the electrode in the oxide-halide, nitrate, sulphate melts, in solid electrolytes, as well as in liquid metals in the determination of dissolved oxygen are well studied. Oxygen electrodes or sensors of various types can be used to determine the concentration of O2- ions, as well as the solubility of oxides in chloride melts [7], but most common is oxygen electrode with a ceramic diaphragm ZrO2(Y2O3)|Pt, O2. Regardless of the chosen design of the ion activity sensor O2– it will include a solid electrolyte, as well as metals and/or their oxides as oxygen electrodes. Chemical and thermal stability of materials will largely determine the correctness and duration of the sensor during the technological operations in the studied melts.
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