【摘要】 采用粉末冶金工艺制备了Fe-TbFeO₃-DyFeO₃块体材料。利用X射线衍射仪、扫描电子显微镜和透射电子显微镜对球磨粉末和烧结块体进行了微观组织分析,测试了块体材料的热物理性能、耐腐蚀性能和离子辐照性能。实验结果表明,通过球磨可获得混合均匀的Fe-Tb₄O₇-Dy₂O₃纳米尺寸颗粒的混合粉末。高温下Tb₄O₇转变成Tb₂O₃,烧结块体中的Tb₂O₃和Dy₂O₃的含量随烧结温度升高而降低,在1 200℃烧结24h可获得Fe-TbFeO₃-DyFeO₃块体材料。Fe-TbFeO₃-DyFeO₃块体材料具有高的热导率和低的热膨胀系数,腐蚀性能较差。在400⁶00℃辐照至25dpa,随辐照温度升高辐照肿胀率逐渐降低,400℃辐照肿胀率最大为0.5%。更多还原

【Abstract】 Fe-TbFeO₃-DyFeO₃ was prepared by powder metallurgy technology.The microstructures of ball milled powder mixtures and sintered bulks were analyzed by X-ray diffraction,scanning electron microscope and transmission electron microscope.Thermophysical properties,corrosion resistance and ion irradiation properties of the sintered Fe-TbFeO₃-DyFeO₃ bulks were measured and analyzed.The experiment results show that the homogeneous nanocrystalline Fe-Tb₄O₇-Dy₂O₃ powder mixtures are obtained by ball milling.Tb₄O₇ transforms to Tb₂O₃ at high temperature.Contents of Tb₂O₃ and Dy₂O₃ decrease with temperature increase during sintering process,and FeTbFeO₃-DyFeO₃ bulks are obtained after sintering at 1 200℃ for 24 h.The bulks have high thermal conductivity,low thermal expansion coefficient and poor corrosion resistance performance.The sintered bulks are irradiated at 400-600℃ for 25 dpa.It is found that the irradiation swelling rate decreases with temperature increase,and the maximum swelling rate is 0.5% at 400 ℃ .更多还原