Study on Direct Alloying Behavior of Lanthanum in Pure Iron Based on the Graphite Oxide Adsorbing
Direct alloying behavior of rare earth lanthanum in pure iron based on the graphite oxide adsorbing has been studied in this paper.Firstly,the rare-earth lanthanum ions were adsorbed on the oxygen-containing functional groups of graphite oxide,after then the intercalation compound was formed and the adsorption process has been analyzed by the Fourier transform infrared spectrometer.Subsequently,the intercalation compound was mixed evenly with aluminum powder and pressed into blocks,which were kept in a high temperature tube furnace under the protection of high purity argon at 1600 ℃for 10 min,and then cooled to room temperature in the furnace.Then the products were analyzed by X-ray diffractometry(XRD)and scanning electron microscopy(SEM).Finally,the above blocks were coated with iron sheet and pressed into the molten pure iron with quartz tube for direct alloying.The contents of rare earth lanthanum in the pure iron samples which were taken out at different times,have been measured by the inductively coupled plasma mass spectrometer.The results prove that:Graphite oxide can adsorb rare earth lanthanum ions on its—OH and—COOH to form graphite rare earth lanthanide intercala-tion compound.At 1600 ℃,Al can reduce the rare-earth lanthanum element of the intercalation compound to LaC2,LaAlO3 and La1.98O2.13S0.84.Specially,LaC2 can be dissolved in molten iron and complete the alloying process of rare-earth lantha-num.