论文部分内容阅读
提出了真空碳热还原制备Mg-Li合金的新思路,并对还原反应进行了热力学分析,研究了还原反应的反应式、吉布斯自由能及临界还原温度。结果表明:真空碳热还原制备Mg-Li合金具备热力学可行性,且其吉布斯自由能随真空度和反应温度的升高而降低;相同真空度下,该反应的临界反应温度低于真空碳热还原制备金属Mg、金属Li的临界温度,反应更容易进行;当真空度为10 Pa,Li_2O的相对比例为0.1时,真空碳热还原制备Mg-Li合金的临界反应温度为1345 K;在常规皮江法(真空硅热还原法)制镁的反应条件下,不论反应物料中Mg O、Li_2O相对比例为多少,真空碳热还原制备Mg-Li合金均具有热力学可行性。
A new idea of preparing Mg-Li alloy by vacuum carbothermal reduction was proposed. The thermodynamic analysis of the reduction reaction was carried out. The reaction equation, Gibbs free energy and critical reduction temperature of the reduction reaction were studied. The results show that the Mg-Li alloy prepared by vacuum carbothermal reduction is thermodynamically feasible and its Gibbs free energy decreases with the increase of vacuum degree and reaction temperature. Under the same degree of vacuum, the critical reaction temperature of the reaction is lower than the vacuum When the vacuum degree is 10 Pa and the relative proportion of Li 2 O is 0.1, the critical reaction temperature of Mg-Li alloy prepared by vacuum carbothermal reduction is 1345 K; It is thermodynamically feasible to synthesize Mg-Li alloy by vacuum carbothermal reduction regardless of the relative proportions of MgO and Li2O in the reaction material under the conventional Pidgeon process (vacuum silicon thermal reduction).