Lei Penghui, Chang Qing, Xiao Mingkun, Ye Chao, Qi Pan, Shi Fangjie, Hang Yuhua, Li Qianwu, Peng Qing
School of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Institute of Clean Energy, Yangtze River Delta Research Institute, Northwestern Polytechnical University, Taicang 215400, China.
Nanomaterials (Basel). 2024 Oct 11;14(20):1629. doi: 10.3390/nano14201629.
A new type of SiC/TiC-TiSiC composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiC/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.
在本工作中，采用放电等离子烧结（SPS）法制备了一种新型的SiC/TiC-TiSiC复合材料。利用透射电子显微镜（TEM）分析了该复合材料在离子辐照（单Xe、Xe+He和Xe+He+H离子）及后续退火过程中的相变和界面开裂情况，主要聚焦于界面区域。Xe离子辐照导致TiC涂层中形成高密度堆垛层错，且SiC纤维完全非晶化。注入的H离子加剧了界面粗化。在900℃退火2小时后，Xe+He+H离子辐照样品中的界面严重受损，导致形成大的气泡和裂纹。这种损伤的发生是因为H原子降低了表面自由能，从而促进了气泡的形核和生长。由于SiC/TiC界面对缺陷的吸收作用，退火后界面附近的SiC纤维区域恢复到初始的纳米多晶结构。
