Preparation of Mg-Li Alloys via Vacuum Silicothermic Reduction Process

摘要:

对真空硅热法制备Mg-Li合金进行实验研究，采用X射线衍射仪对产物和残渣进行物相分析，利用扫描电子显微镜观察产物的冷凝形貌。XRD分析表明，产物的主要成分为Mg，反应的主渣相为Ca2SiO4。SEM分析表明，产物微观上相继呈片状、短棒状和絮状。同时研究了在未添加萤石时硅铁添加量、还原温度、成型压力和保温时间对Mg-Li合金制备的影响。在还原温度1250 ℃、硅铁添加量110%、成型压力15 MPa和保温时间150 min 的条件下，镁锂还原率分别为81.38%和99.58%

Abstract:

Preparation of Mg-Li alloys by vacuum silicothermic reduction process was investigated. XRD was employed to analyze the phase composition of the product and slag. SEM was used to characterize the condensation morphology of the product. The results show that the main phase of the product is Mg and that of slag is Ca2SiO4. The product successively presents lamellar, short rod-like and flocculent shape along with the condensation. When adding no fluorite, the impacts of extraction conditions, including ferrosilicon addition, temperature, compacting pressure and holding time, on Mg and Li recoveries were evaluated. Under the conditions of temperature of 1250 °C, ferrosilicon addition of 110%, compacting pressure of 15 MPa and holding time of 150 min, Mg and Li recoveries are 81.38% and 99.58%, respectively