Polymer-derived SiC ceramics have been increasingly used in the field of nuclear energy. Herein, we synthetized polymer-derived SiCs with varying SiC/C heterogeneous interfacial properties by pyrolyzing the ceramics at different temperatures. Subsequently, we studied the effect of these interfacial properties on the irradiation behavior (i.e., volume swelling, amorphization, and mechanical properties) of the SiC ceramics. In the case of crystalline ceramics (pyrolyzed at 1150–1500 °C), the presence of a nano-crystalline graphite (NC-G) phase with sp³/sp² hybridization ratios of 0.40–1.27 further enhanced the swelling resistance of nano-SiC by increasing the defect trapping capability of the interfaces. In contrast, amorphous ceramics (pyrolyzed at 900–1100 °C) showed low penetration depths and superior stabilities upon irradiation. These strong ion cascade blocking characteristics may result from the atomic short-range order of these materials. This approach allows optimum design of polymer-derived SiC with superior swelling resistance and stability under room-temperature irradiation.

聚合物衍生的SiC陶瓷已越来越多地用于核能领域。本文中，我们通过在不同温度下热解陶瓷来合成具有变化的SiC / C异质界面性质的聚合物衍生的SiC。随后，我们研究了这些界面特性对SiC陶瓷的辐照行为（即，体积溶胀，非晶化和机械性能）的影响。对于晶体陶瓷（在1150–1500°C时热解），存在具有sp ³ / sp ²的纳米晶体石墨（NC-G）相0.40–1.27的杂化比通过增加界面的缺陷捕获能力进一步增强了纳米SiC的溶胀性。相反，无定形陶瓷（在900–1100°C的温度下热解）显示出较低的穿透深度和辐照时的优异稳定性。这些强的离子级联阻挡特性可能是由于这些材料的原子短程有序。这种方法可以优化设计聚合物衍生的SiC，在室温辐射下具有出色的抗溶胀性和稳定性。