论文部分内容阅读
提出真空硅热还原制备Mg-Li合金的新方法。热力学分析结果表明,硅热法还原制备Mg-Li合金的适宜条件为:真空度≤102Pa,还原温度≥1400 K;还原温度为1473 K时,同步液化冷凝镁锂的温度T<1062 K,同步固化冷凝镁锂的温度T<454K。在温度1200℃、真空度10～20 Pa、还原时间2 h和冷凝温度168～210℃的条件下进行实验研究,制得结晶较好的块状Mg-Li合金。X射线衍射结果表明,Mg-Li合金主要成分为Mg、Li3Mg17和Li0.92Mg4.08,残渣主要成分为Ca2SiO4。扫描电镜分析表明,Mg-Li合金呈羽毛状。X射线荧光及原子吸收分光光度计检测表明,Mg-Li合金中镁含量与锂含量分别为77.58%,8.27%。
A new method for preparing Mg-Li alloy by vacuum thermal reduction of silicon was proposed. The results of thermodynamic analysis show that the optimum conditions for the preparation of Mg-Li alloy by reduction of silicon by thermal reduction are as follows: the degree of vacuum is less than or equal to 102Pa and the reduction temperature is greater than or equal to 1400 K; when the reduction temperature is 1473 K, the temperature of synchronous liquefaction magnesium lithium is T <1062 K, Solidified lithium magnesium condensation temperature T <454K. Under the condition of temperature of 1200 ℃, degree of vacuum of 10 ~ 20 Pa, reduction time of 2 h and condensation temperature of 168 ~ 210 ℃, the better crystallized Mg-Li alloy was obtained. X-ray diffraction results show that the main components of Mg-Li alloy is Mg, Li3Mg17 and Li0.92Mg4.08, the main component of the residue is Ca2SiO4. Scanning electron microscopy analysis showed that the Mg-Li alloy feathers. X-ray fluorescence and atomic absorption spectrophotometer test showed that the content of magnesium and lithium in Mg-Li alloy were 77.58% and 8.27% respectively.