多级深度还原法制备Ti6Al4V合金粉体机理的研究

本文对多级深度还原法制备Ti6Al4V合金粉体过程中的镁热自蔓延反应机理进行了探究。使用XRD,SEM,ICP以及激光粒度分析仪对产物进行了表征。结果表明:Al和V元素会固溶进入Ti基体中使其衍射峰向高角度偏移;“预烧结-还原-烧结”和“还原-烧结”两种反应模式是造成产物形貌差异的主要原因;自蔓延产物的体积平均经D4.3]和体系的燃烧温度正相关;残留的Mg主要以MgTiO3和MgAl2O4等复合物的形式存在。使用金属Ca进行深度还原可以将最终产物中的Mg和O含量分别降低至0.01wt.%和0.24wt.%。

Study on Mechanism of Preparation of Ti6Al4V Alloy Powder by Multistage Deep Reduction process

The Ti6Al4V alloy powder has been successfully prepared by the multi-stage deep reduction method. In this paper, the mechanism of the magnesium thermal self-propagating reaction in the process has been explored. The products were characterized by XRD, SEM, ICP and laser particle size analyzer. The results show that Al and V elements will enter the Ti matrix as a solid solution, causing the diffraction peaks to shift to high angles. The two reaction modes of "pre-sintering-reduction-sintering" and "reduction-sintering" are the main reasons for the difference in product morphology. The volume averageD4,3] of self-propagating products is positively correlated with the combustion temperature of the system. The remaining Mg mainly exists in the form of complexes such as MgTiO3 and MgAl2O4. These ternary composite oxides can be decomposed by metal calcium in the deep reduction stage, and finally the Mg and O in the product can be reduced to 0.01wt.% and 0.24wt.%, respectively.