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采用Si3N4结合SiC板作为3kA液态下阴极稀土金属电解槽的侧壁材料,进行了实际电解工艺试验,考察了Si3N4结合SiC材料在稀土熔盐电解槽上的使用效果,研究表明,Si3N4结合SiC材料在稀土熔盐中腐蚀较严重,尤其是靠近电解槽阴极位置,由于弥散在电解质中的金属雾和阳极产生的气体加剧了Si3N4结合SiC材料受腐蚀破坏;板材由于受热不均产生了开裂现象,且开裂位置会加剧材料的腐蚀破坏,进一步的分析表明,Si3N4结合SiC材料在稀土熔盐中主要受腐蚀的是含Si3N4的结合相。
The Si3N4 bonded SiC plate was used as the side wall material of the 3kA cathode cathode rare earth metal electrolytic cell. The actual electrolytic process was tested. The effect of using Si3N4 bonded SiC material on rare earth molten salt electrolysis cell was investigated. The results show that Si3N4 combined SiC material In rare earth molten salt corrosion more serious, especially close to the cathode position of the cell, due to dispersed in the electrolyte in the metal mist and anode gas exacerbated Si3N4 bonded SiC material by the corrosion damage; sheet due to uneven heating has a cracking phenomenon, And the crack location will aggravate the corrosion of the material. Further analysis shows that Si3N4 bonded SiC material mainly corroded in the rare earth molten salt is the Si3N4-containing binder phase.