复盐固溶-电解共沉积制备稀土镁合金的基础研究

项目名称： 复盐固溶-电解共沉积制备稀土镁合金的基础研究

项目编号： No.51501178

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 张志敏

作者单位： 中国科学院过程工程研究所

项目金额： 16万元

中文摘要： 与传统的镁铝系合金相比，稀土镁合金具有优异的高温强度和蠕变抗力，是一种非常有发展前景的高强耐热材料。为了解决稀土镁合金制备过程中存在的合金均匀性和稳定性差、无水原料制备成本高的问题，本项目拟采用廉价的六水氯化镁和稀土氧化物为原料，通过复盐固溶脱水和复盐固溶氯化相结合的方法直接合成高纯度电解质熔体，进而通过电解共沉积法制备高强耐热的Mg-Gd-Y系和Mg-Nd-Y系合金。通过研究稀土氧化物复盐氯化过程和六水氯化镁复盐脱水过程的相互影响，探索高纯度电解质熔体的形成机制；通过研究电解质熔体物理化学性质对电解过程的影响，指导电解质熔体物化性能调控，实现电解过程能耗的降低；通过建立电解参数与合金成分的对应关系，实现稀土镁合金成分的控制。

中文关键词： 稀土镁合金；制备工艺；水解控制

英文摘要： Compared with the Mg-Al alloys, magnesium-rare earth alloys have better elevated temperature strength and creep resistance, which makes them very promising materials with high strength and heat resistance. To resolve the poor homogeneity and the poor stability of magnesium-rare earth alloys and reduce the production costs of the anhydrous raw materials, we plan to direct synthesize high-purity molten salts by combining the dehydration and the chloration of the complex salts and solid solutions using magnesium chloride hexahydrate and rare earth oxides as raw materials. After that, we plan to prepare Mg-Gd-Y and Mg-Nd-Y alloys with high strength and heat resistance by electrochemical codeposition. By studying the interaction between the dehydration of the complex salts and solid solution of magnesium chloride hexahydrate and the chloration of the complex salts and solid solution of rare earth oxides, we plan to explore the formation mechanism of high-purity electrolyte. By studying the effects of the physicochemical properties of molten salts on the electrolysis process, we plan to regulate its physicochemical properties. By establishing the relationship between electrolytic parameters and chemical composition of the target alloys, we can realize the regulation of the chemical composition of magnesium-rare earth alloys.

英文关键词： Magnesium-rare earth alloys;Preparation technology;Hydrolysis controll