真空硅热还原制备Mg-Sr合金的研究

Preparation of Mg-Sr alloys by vacuum silicothermic reduction

分析真空硅热还原制备金属镁、金属锶及Mg-Sr的热力学条件。结果表明,真空硅热还原制备Mg-Sr合金反应的吉布斯自由能及热力学临界温度随系统气压的减小而降低,随Mg、Sr混合蒸气中Sr的摩尔分数的增大而降低。对应常规真空硅热还原制备金属镁(皮江法)的反应温度(1 473 K)、系统气压(13.3 Pa),无论Mg、Sr相对比例如何,真空硅热还原制备Mg-Sr合金的反应均具备热力学可行性。实验证明真空硅热还原制备Mg-Sr合金是可以实现的。

Mg, Sr and Mg-Sr alloys prepared by vacuum silicothermic reduction were analysed with thermodynamic method. The results show that with system pressure reducing and the strontium＇ s mole fraction in Sr and Mg mixed steam decreasing, Gibbs free energy and critical temperature of reduction reaction reduce. Under the reaction temperature （1 473 K） and system pressure （13.3 Pa） of normal silicothermic reduction producing metallic magnesium （Pidgeon process） , no matter what the relative proportion of Mg and Sr in the mixed steam is, the reactions of preparation of Mg-Sr alloys by vacuum silicothermic reduction have thermodynamic feasibility. The experiments show that preparation of Mg-Sr alloys by vacuum silicothermic reduction can be realized.