在300℃、8~8.2MPa的模拟压水环境对UN/U3Si2(20wt%)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25μm。在腐蚀区域,芯块出现黑色的腐蚀坑。
The UN/U3Si2(20wt%) composite pellets was first corroded at 300℃ under 8~8.2MPa for 1h, and then, the macroscopic morphology of UN/U3Si2(20wt%) composite pellets after corrosion was observed by metallographic microscopy. After corrosion for 1h, the surface of UN/U3Si2(20wt%) composite pellets was firstly corroded and then gradually expanded to the inner of these pellets. The corrosion depth was about 25μm. Moreover, some black corrosion pits appeared at the corrosion area.