【摘要】 U₃Si₂作为核燃料,相比于传统的UO₂燃料,具有高的铀密度和良好的导热性等优点,是极具潜力的下一代核燃料候选。U₃Si₂多采用电弧熔炼的方法制备,但目前对U₃Si₂材料的表面杂质状态的研究仍有待深入开展。本文通过真空四电弧熔炼方法制得了U₃Si₂样品。通过X射线衍射仪分析了样品结构与取向特性。能量色散谱仪以及X射线光电子能谱分析表明,电弧熔炼得到的U₃Si₂样品主要含有C、O杂质,其中C杂质属于表面附着,而O杂质来源于表面氧化,以及熔炼过程中引入的少量O杂质。更多还原

【Abstract】 The U₃Si₂ bulk material,an advanced nuclear fuel with good thermal conductivity and high uranium density,was prepared by tetra-arc melting in vacuum.The microstructures and depth profile of main impurities were characterized with X-ray diffraction spectroscopy,energy dispersive spectroscopy and X-ray photoelectron spectroscopy.The results show that the main uniformly distributed impurities were carbon and oxygen.To be specific,a decreasing carbon depth profile possibly originated from oxidation of hydrocarbon in residue gas and carbon surface segregation; and the oxygen depth distribution probably resulted from surface oxidation in argon ion sputtering and oxygen doping or weak oxidation in arc melting of liquid U₃Si₂.更多还原