铝热自蔓延还原氧化铪实验研究

Experimental Investigation for Self-propagating Aluminum Thermal Reduction of Hafnia

摘要: 本文采用化学分析、X射线衍射（XRD）与扫描电子显微镜（SEM）等手段和方法，对铝热自蔓延还原氧化铪方法进行实验研究。结果表明，在物料单位发热量大于3 000 kJ/kg的条件下，可实现氧化铪的直接还原，原料加入CaO后，产物的渣金分离效果明显。XRD分析结果表明，还原产物为Al3Hf金属间化合物；SEM和能谱仪（EDS）分析结果表明，金属产物呈现片状，不规则线性排列，由Al3Hf相区和Al相区组成；化学分析结果表明，金属产物中氧含量低至0.20%，铪含量高达41.20%。

Abstract: The experiment of self-propagating aluminum thermal reduction of hafnia was investigated with the X-ray diffraction (XRD), scanning electron microscope (SEM) and chemical analysis. The results show that hafnia can be reduced when the heat of reaction per unit mass is greater than 3 000 kJ/kg and the separation of slagmetal is good after adding the calcium oxide. The results of XRD analysis show that reduced product is Al3Hf mainly. The results of SEM/energy disperse spectroscopy (EDS) show that metal product, which is composed of Al3Hf phase and Al phase, is lamellar and irregular arrangement. The chemical analysis results show that the oxygen content of the metal is as low as 0.20% and the hafnium content is up to 41.20%.