利用金相显微镜观察UN/U₃Si₂(30wt%)复合芯块宏观形貌。结果表明，UN/U₃Si₂(30wt%)复合芯块内部存在三种不同衬度的微观组织。其中，区域3所示的微观组织为芯块的主要组成，区域2所示的微观组织衬度较暗，尺寸较大，弥散分布在基体中，区域1所示的微观组织衬度较亮，尺寸较小，且进行弥散分布在基体中。

The macro-morphology of UN/U₃Si₂(30wt%) composite pellets was characterized by metallographic microscope. The results show that three typical microstructures are observed in the UN/U₃Si₂(30wt%) composite pellets. The microstructures shown in the region 1 are the main components of the pellets. As shown in the region 2, the contrast of these microstructures is bright, and these microstructures disperse in the matrix. Moreover, the contrast of the microstructures shown in the region 3 is dark, and these microstructures disperse in the matrix.