Mg、Ca共还原制备V-4Cr-4Ti合金粗品的热力学分析及试验

Thermodynamic Analysis and Experimental Research on Preparation of V-4Cr-4Ti Crude Alloy by Mg and Ca Co-Reduction

对Mg、Ca共还原制备V-4Cr-4Ti合金粗品的反应过程进行了热力学分析,由化学反应的标准吉布斯自由能确定了反应的可行性以及Ti的易氧化性;利用FactSage软件进行了试验方案设计,计算得到了反应的绝热燃烧温度为2 657.86℃,渣系熔点约为2 100℃,单位热效应为3 499.4 J/g。验证试验结果表明:按FactSage软件的设计方案可制备出V含量为91.6%,Cr含量为3.57%,Ti含量为1.53%的V-4Cr-4Ti合金粗品,但因Ti的不均匀性和夹渣现象还需进一步精炼。

The reaction process for preparation of V-4Cr-4Ti crude alloy by Mg and Ca co-reduction was thermodynamically analyzed. The feasibility of the reactions as well as the oxidation vulnerability of Ti was confirmed by the standard Gibbs free energies of chemical reactions. Experiments were designed by Fact- Sage software, and the adiabatic combustion temperature of the process was calculated to be 2 657.86 ℃, with about 2 100 ℃ of estimated slag melting point and 3 499.4 J . g-1 of unit thermal effect. The experimental results show that V-4Cr-4Ti crude alloy with 91.6% V, 3.57% Cr and 1.53% Ti can be obtained according to design scheme by Fact-Sage, but further refining is necessary due to the inhomogeneity of Ti and slag inclusion in the alloy.