电铝热法钒铝合金中杂质铁元素的来源分析

Sources analysis of Fe impurity in vanadium-aluminium alloy by electro-aluminothermic method

以电铝热法钒铝合金生产系统为研究平台,对CaO-Al2O3渣系钒铝合金中的杂质铁元素来源和走向进行分析。结果表明,杂质Fe元素主要由反应炉耐材引入的(占55.38%);系统中87.65%的Fe进入到钒铝合金中,与钒结合的能力较强;合金中Fe分布不均匀,合金锭下表皮和侧壁Fe含量高;铁以单质的形式存在合金中。因此需对合金锭表面进行处理,并通过降低耐材中的Fe,控制反应温度和时间,以减少进入钒铝合金中的Fe量,为生产航空级钒铝合金提供技术支撑和研究方向。

The sources and trends of iron impurities in CaO-Al2O3 slag-based vanadium-aluminium alloys were analyzed on the basis of the production system of electrothermic vanadium-aluminium alloys. The results show that Fe impurities are mainly introduced by reactor refractories (55.38%), and 87.65% of Fe in the system enters into vanadium-aluminium alloy owing to a strong bind ability of iron to vanadium. The distribution of Fe in the alloy is uneven. The content of Fe is high in the lower surface and side wall of the alloy ingot, and the iron exists in the form of elementary substance. Therefore, it is necessary to treat the surface of alloy ingot, and reduce the amount of Fe entering vanadium-aluminium alloy by reducing Fe in refractory and controlling reaction temperature and reaction time, which provides technical support and research direction for the production of aerospace grade vanadium-aluminium alloy.