在300℃、8~8.2MPa的模拟压水环境对UN/U3Si2(10wt%)复合芯块考核1h,利用金相显微镜观察芯块腐蚀后的宏观形貌。经考核1h后,芯块表面首先被腐蚀,然后逐渐向芯块内部扩展,芯块的腐蚀深度为50μm~370μm。在腐蚀区域,芯块出现黑色的腐蚀坑。
The UN/U3Si2(10wt%) composite pellets was first corroded at 300℃ under 8~8.2MPa for 1h, and then, the macroscopic morphology of UN/U3Si2(10wt%) composite pellets after corrosion was observed by metallographic microscopy. After corrosion for 1h, the surface of UN/U3Si2(10wt%) composite pellets was firstly corroded and then gradually expanded to the inner of these pellets. The corrosion depth was about 50μm~370μm. Moreover, some black corrosion pits appeared at the corrosion area.