多级深度还原法制备Ti6Al4V合金粉体  

Preparation of Ti6Al4V Alloy Powder by Multistage Depth Reduction Process

作　　者：闫基森 豆志河 张廷安[1,2] 牛丽萍 Yan Jisen;Dou Zhihe;Zhang Tingan;Niu Liping(School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2021年第8期2973-2978,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(U1908225,U1702253);中央高校基本科研业务费专项资金(N182515007,N170908001,N2025004)。

摘　　要：依据变价金属Ti和V的氧化物在还原过程中逐级还原的特性,提出使用金属氧化物(TiO_(2),V2O_(5))作为原料的多级深度还原法制备Ti6Al4V合金粉体的新思路。首先计算了TiO_(2)-V2O_(5)-Mg-Ca体系的吉布斯自由能变,结果表明先进行镁热自蔓延反应,后进行钙热深度还原反应制备Ti6Al4V合金粉体在热力学上具备可行性。然后通过实验进行了验证。镁热自蔓延反应产物酸浸后除去MgO可得到氧含量为15.92%的多孔Ti-Al-V-O前驱体。配入金属Ca后进行深度脱氧可得到低氧的Ti6Al4V合金粉体(Al:6.2%,V:3.64%,O:0.24%,Mg:0.01%,Ca含量<0.01%,质量分数)。According to the thermodynamic characteristics of step-by-step reduction of high valent metal oxides and the thermodynamic transmutation of different equilibrium phases in the reduction process,a new idea of preparing Ti6Al4V alloy powder by multi-stage reduction of metal oxides(TiO_(2),V2O_(5))as raw materials were put forward.Firstly,the Gibbs free energy change of TiO_(2)-V2O_(5)-Mg-Ca system was calculated.The results show that it is thermodynamically feasible to obtain Ti6Al4V alloy powder by magnesium thermal self propagating reaction and calcium thermal deep reduction reaction.Then it was verified by experiments.After acid leaching of the product of magnesium thermal self-propagating reaction,MgO can be removed to obtain a porous Ti-Al-V-O precursor with an oxygen content of 15.92 wt%.Low-oxygen Ti6Al4V alloy powder(Al:6.2 wt%,V:3.64 wt%,O:0.24 wt%,Mg:0.01 wt%,Ca:<0.01 wt%)can be obtained by adding metal Ca in the later stage for deep deoxidation.

关 键 词：多级深度还原 酸洗 自蔓延反应 Ti6Al4V合金粉体 

分 类 号：TG146.23[一般工业技术—材料科学与工程]