TY - JOUR AU - ZHU, Guangxiang AU - FENG, Qian AU - YANG, Jinshan AU - HU, Jianbao AU - WANG, Hongda AU - XUE, Yudong AU - SHAN, Qingliang AU - DONG, Shaoming PY - 2019 TI - Effect of BNNTs/matrix interface tailoring on toughness and fracture morphology of hierarchical SiCf/SiC composites JO - Journal of Advanced Ceramics SN - 2226-4108 SP - 555 EP - 563 VL - 8 IS - 4 AB - A thin BN interphase is applied on BNNTs surface to tailor the interfacial bonding between BNNTs and SiC matrix in hierarchical SiCf/SiC composites. The thickness of BN interphase ranging from 10 to 70 nm can be optimized by chemical vapor deposition after BNNTs are in situ grown on SiC fiber surface. Without BN interphase, the fracture toughness of hierarchical SiCf/SiC composites can be impaired by 13.6% due to strong interfacial bonding. As long as BN interphase with 30-45 nm thickness is applied, the interfacial bonding can be optimized and fracture toughness of hierarchical composites can be improved by 27.3%. It implies that tailoring BNNTs/matrix interface by depositing a layer of BN interphase is in favor of activating energy dissipation mechanisms at nanoscale induced by BNNTs. UR - https://doi.org/10.1007/s40145-019-0338-0 DO - 10.1007/s40145-019-0338-0