Gd2O3-UO2芯块晶粒尺寸的影响因素研究

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Gd₂O₃-UO₂芯块晶粒尺寸的影响因素研究

National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 用光学显微镜和图象分析仪研究了影响Gd₂O₃-UO₂芯块晶粒尺寸的因素。对烧结气氛、混料方式、芯块在烧结炉中的位置、以及在UO₂芯块中添加U₃O₈、草酸铵和助烧剂（Al、Ti、V的氧化物）等给Gd₂O₃-UO₂芯块晶粒尺寸带来的影响进行了研究。结果表明,球磨工艺、添加助烧剂和微氧化气氛烧结等都有利于芯块的晶粒生长,晶粒大小分布均匀;添加U₃O₈和草酸铵对芯块的晶粒生长无明显的影响。
- Gd₂O₃-UO₂芯块 /
- 晶粒尺寸 /
- 影响因素研究
Abstract: The factors with effects on the grain size in Gd₂O₃-UO₂ pellets have been investigated by metalloscope and image analyzer. We have investigated the effects on the grain size in Gd₂O₃-UO₂ pellets due to the sintering atmosphere, blending methods, pellets position in sintering furnace, and additive U₃O₈, ammonium oxalate and oxides （Al, Ti, V） in Gd₂O₃-UO₂ pellets. The results have shown that grain growth and grain size distribution homogeneity of Gd₂O₃-UO₂ pellets were enhanced by mixing methods using ball process, additive of oxides （Al,Ti,V） and sintering of low oxidizing atmospheres. The effect of adding U₃O₈ and ammonium oxalate on the grain growth of pellets is not obvious.
- Gd₂O₃-UO₂ Pellets /
- Grain size /
- Study of affecting factors