钛合金生产用铌铝合金制备工艺的研究

Research on the Preparation Process of Niobium Aluminum Alloy for Titanium Alloy Production

文章以铝热还原法制备铌铝合金,研究了不同渣系配比的可行性,单位反应热量对产品收率的影响,不同原材料对产品中Fe、Si的影响,合金中存在“高铌相”的原因及控制方法。结果表明:采用Al_(2)O_(3)-CaO渣系,当mole Al_(2)O_(3)/(Al_(2)O_(3)+CaO)=0.703时,实践可行;单位反应热量控制在3200~3400 kJ/kg,产品的收率在95%左右;铝粒中的Si含量控制在0.05%,铝粒中的Fe含量控制在0.10%,CaO中的Si含量控制在0.40%以内,就可制备出Si、Fe含量合格的铌铝合金产品;采用铝热还原+真空感应熔炼,可制备出成分均匀、无夹杂的高端铌铝合金产品。

The feasibility of different slag ratios,the effect of unit reaction heat on product yield,the effect of different raw materials on Fe and Si in the product,and the reasons and control methods for the presence of"high niobium phase"in the alloy were studied by aluminum thermal reduction method to prepare niobium aluminum alloy.The results show that using Al_(2)O_(3)-CaO slag system,when mole Al_(2)O_(3)/(Al_(2)O_(3)+CaO)=0.703,it is feasible in practice.The unit reaction heat is controlled between 3200~3400 kJ/kg,and the product yield is around 95%.By controlling the Si content in aluminum particles at 0.05%,Fe content in aluminum particles at 0.10%,and Si content in CaO within 0.40%,qualified niobium aluminum alloy products with Si and Fe content can be prepared.High-end niobium aluminum alloy products with uniform composition and no inclusions can be prepared by first using aluminum thermal reduction method and then vacuum induction melting method.