硼化物、锰去除再生Al-Si合金中铁元素机理研究  

Mechanism of Iron Removal from Secondary Al-Si Melt by Boron Compounds and Mn

作　　者：杨怀德[1] 龙思远[1,2] 吴明放[1] 范超[1,3] 吴星宇[1] 

机构地区：[1]重庆大学,重庆400030 [2]国家镁合金材料工程技术研究中心,重庆400030 [3]广西科技大学,广西柳州545006

出　　处：《稀有金属材料与工程》2015年第3期621-627,共7页Rare Metal Materials and Engineering

基　　金：9C省部产学研结合重大专项项目-汽车轻量化构件精益铸造关键技术及产业化集群示范(2012A090300016)

摘　　要：研究了KBF4和KBF4、Mn对再生Al-Si合金中的富铁相变质行为的影响以及采用沉降法进行除铁探索。应用光学显微镜(OM)、扫描电镜(SEM)对试样组织进行形貌观察,采用X射线衍射仪分析仪(XRD)、X射线荧光光谱分析仪(XRF)对试样进行相分析和成分分析,利用差分扫描量热仪(DSC)研究相转变温度。研究表明,硼化物(KBF4)能促使再生Al-Si合金析出初生α-Fe相;Mn元素能促使初生α-Fe相长大,初生α-Fe相会沉淀到炉底。加硼化物(KBF4)、Mn的再生Al-Si熔体随炉冷却形成的铝锭,铁含量随着离铝锭顶端的距离增加而增加,铝锭中上部铁含量低于原始量。Effects of boron compound addition and the combined addition of boron compound and Mn on the modification of Fe-rich intermetallics and the removal of iron by settlement were studied in secondary Al-Si alloys. Microstructure morphology was observed by optical microscope（OM） and scanning electric microscope（SEM）. Compositions and phases were analyzed by X-ray fluorescence（XRF）and X-ray diffraction（XRD）, respectively. Phase-transition temperature of samples was examined by differential scanning calorimetric（DSC）. It is indicated that the precipitation of primary Fe-rich intermetallics is caused by boron compound. The size of primary Fe-rich intermetallics increases with the higher content of Mn. When adding boron compound and Mn together, the content of Fe increases with the increasing distance from the top of the aluminum ingot and the iron content of the upper part of ingot is far lower than the original amount.

关 键 词：富铁相 变质 再生Al-Si合金 除铁 硼化物 

分 类 号：TG146.21[一般工业技术—材料科学与工程]