弥散燃料板芯体中U-Mo/Al-Si合金基体反应层性质研究  

Study on Characteristics of U-Mo/Al-Si Interaction Layers of Dispersion Fuel Plates

作　　者：刘利剑[1] 尹昌耕[1] 陈建刚[1] 孙长龙[1] 刘云明[1] 

机构地区：[1]中国核动力研究设计院核燃料及材料国家重点实验室,成都610041

出　　处：《核动力工程》2014年第2期161-165,共5页Nuclear Power Engineering

摘　　要：针对弥散型燃料板采用实验方法分析U-Mo燃料相与Al-Si基体反应层的性质。实验结果表明:反应层主要出现在U-Mo燃料颗粒的内部微裂纹处及燃料颗粒与基体界面处,其形貌和厚度均不规则。U-Mo与Al-Si遵循空位扩散机制,扩散过程主要为Al、Si向U-Mo合金的扩散。在反应层中Al含量基本维持不变,Si含量沿基体-燃料相方向递增,并聚集在U-Mo侧的反应层中。当基体中Si含量达到5%时,可明显抑制扩散反应的进行,从而改进燃料板性能。In this paper, we analyzed the characteristics of U-Mo/AI-Si interaction layers of dispersion fuel plates. The results show that the interaction layers （IL） are with irregular morphology and uneven thickness, and are mainly formed in the internal micro cracks of the dispersion fuel particles or at the interface between the particles and the substrates. The diffusion mechanism of U-Mo/AI-Si is the vacancy diffusion, A1 and Si are migrating elements, and the diffusion reaction is that AI and Si diffuse to U-Mo alloy. Inside the interaction layers, the AI content keeps constant basically, but the Si content gradually increases with the substrate-fuel direction, and the maximum content of Si appears interaction layers near the U-Mo side. Adding about 5wt% Si into AI matrix can restrain the diffusion reaction, and improve the performance of dispersion fuel plates finally.

关 键 词：U MO合金 Al SI合金 反应层 扩散反应 

分 类 号：TL341[核科学技术—核技术及应用]