铝铜合金重力沉降除铁研究

Study on Iron Removal in Al-Cu Alloy by Gravity Settling

采用光学显微镜、扫描电镜、光谱分析等技术手段研究了铝铜合金重力沉降除铁工艺。结果表明,Al-5.0Cu-1.5Fe合金中通过添加2.2%Mn,在670℃保温4 h后,试样上部的铁含量为0.65%,除铁率约为57%。试样中部的铁含量为1.05%,除铁率为30%。Mn元素能促使初生Al_6(FeMn)相形成,由于初生Al_6(FeMn)密度大于铝熔体密度,从而可以沉降到坩埚底部,实现铝铜合金重力沉降除铁的目的。

The gravity settlement technology removes iron from AI-Cu alloys was studied by optical microscope, scanning electron microscopy and optical emission spectrometer. The results show that adding 2.2%Mn to Al-5.0Cu-1.5Fe alloy, and heating at 670℃ for 4 hours, the top of the sample has an iron content of 0.65%, and iron removal ratio is about 57%. The iron content in the middle of the sample is 1.05%, and the iron removal ratio is 30%. Mn element can promote the formation of primary Al6 （FeMn） phase. As the density of primary A16 （FeMn） is greater than that of aluminum melt, it can be deposited at the bottom of the crucible to realize the purpose of gravity precipitation and iron removal of Al-Cu alloy.