UO_2-Er_2O_3燃料芯块制备技术初步研究
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摘要
对Er_2O_3质量分数为4.32%的UO_2-Er_2O_3可燃毒物燃料芯块的制备技术进行了初步研究。通过对比不同工艺条件(混料、成型、烧结)下,芯块的外观完整度、密度、晶粒度等性能,初步得到了UO_2-Er_2O_3燃料芯块的制备技术。试验表明:干法球磨混合6 h,添加5‰的聚乙烯醇(PVA),300～350 MPa压力下冷压成型,1700～1750℃、H_2气氛中烧结2～3 h,可得到外观完整、密度大于等于95%理论密度(T.D.)、晶粒尺寸大于8μm的UO_2-Er_2O_3燃料芯块。
A preliminary study is conducted for the preparation technology of UO_2-Er_2O_3 burnable poisonous fuel pellets with Er_2O_3 mass fraction of 4.32%. We obtain the preparation technology by comparing the performance(integrity, density, and grain size) of the pellets under different conditions(mixing, pressing, and sintering). The experiments show that UO_2-Er_2O_3 fuel pellets with good integrity which theoretical density≥95% and grain size larger than 8 μm can be obtained by mixing the powders with planetary ball mill for 6 h and add 5‰ PVA, pressing under 300 ～350 MPa, sintering at 1700～1750℃ with hydrogen atmosphere for 2 ～3 h.
A preliminary study is conducted for the preparation technology of UO_2-Er_2O_3 burnable poisonous fuel pellets with Er_2O_3 mass fraction of 4.32%. We obtain the preparation technology by comparing the performance(integrity, density, and grain size) of the pellets under different conditions(mixing, pressing, and sintering). The experiments show that UO_2-Er_2O_3 fuel pellets with good integrity which theoretical density≥95% and grain size larger than 8 μm can be obtained by mixing the powders with planetary ball mill for 6 h and add 5‰ PVA, pressing under 300 ～350 MPa, sintering at 1700～1750℃ with hydrogen atmosphere for 2 ～3 h.
引文
[1]Si-Hyung Kim,Yeon-Gu Kim.Thermal conductivity of near-stoichiometric(U,Er)O2 solid solutions[J].Journal of Nuclear Materials.2005,342:119-124.
[2]Shinsuke Yamanaka,Ken Kurosaki.Thermal and mechanical properties of(U,Er)O2[J].Journal of Nuclear Materials.2009,389:115-118.
[2]Shinsuke Yamanaka,Ken Kurosaki.Thermal and mechanical properties of(U,Er)O2[J].Journal of Nuclear Materials.2009,389:115-118.