Abstract

The degradation of the ceramic materials based on magnesium oxide, aluminum oxide, or silicon nitride in the LiCl–KCl melt containing uranium, cerium, or neodymium trichloride of various concentrations is studied in the temperature range 470–650°C. Gravimetric, chemical–analytical, electron-probe microanalysis, and X-ray diffraction techniques are used. All ceramic materials are shown to be chemically resistant in the given melts. The porosity of the ceramics plays an important role in the choice of materials for structural elements. The higher the porosity, the larger the increase in the sample mass after an experiment. The mass increment increases with the temperature. The ceramics based on magnesium oxide reacts with aluminum oxide to form magnesium aluminate, which does not allow them to be used together. The best results are shown by the ceramics based on silicon nitride, since it is low-porous and chemically stable. The addition of cerium or neodymium trichloride to the melt weakly affects the ceramics under study.

中文翻译：

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含（Ce，Nd，U）Cl 3添加剂的LiCl–KCl熔体中基于MgO，Al 2 O 3或Si 3 N 4的陶瓷的降解

摘要

在470–650°C的温度范围内，研究了含有不同浓度的铀，铈或三氯化钕的LiCl–KCl熔体中基于氧化镁，氧化铝或氮化硅的陶瓷材料的降解。使用了重量分析，化学分析，电子探针显微分析和X射线衍射技术。在给定的熔体中，所有陶瓷材料均显示出化学抗性。陶瓷的孔隙度在选择结构元件的材料方面起着重要作用。孔隙率越高，实验后样品质量的增加越大。质量增量随温度而增加。基于氧化镁的陶瓷与氧化铝反应形成铝酸镁，不允许将它们一起使用。基于氮化硅的陶瓷表现出最好的结果，因为它是低孔且化学稳定的。在熔体中添加铈或三氯化钕对所研究的陶瓷影响很小。