Interfacial regulation and fracture mechanism of Al-Si/SiC composites infiltrated under super-gravity field

作者：Wu, Chuandong; Lu, Yuehui; Zhang, Penghui; Guo, Tao; Wang, Jiaming; Li, Yingyu; Shen, Shuai; Yang, Tian; Gan, Zhanghua^*; Luo, Guoqiang; Liu, Jing

来源：Journal of Materials Research and Technology-JMR&T, 2023, 27: 6448-6457.

DOI：10.1016/j.jmrt.2023.11.107

• Composites
• Interfacial regulation
• Fracture mechanism

We reported a novel method to prepare Al-Si/SiC composites infiltrated under super-gravity field without Mg addition. Noted that centrifugal force acted as the main driving force to overcome the penetration resistance, making it feasible to obtain the Al-Si/SiC composite with high relative density (>= 99.3 %). The interfacial reaction between Al and SiC was retarded by Si addition under super-gravity field. Interestingly, the rod-like eutectic Si was detected at Al-SiC interface with semi-continuous distribution, leading to the excellent bending strength (342.6 +/- 1.0 MPa), enhanced thermal conductivity (173 W/m K at 373 K), and relatively low coefficient of thermal expansion (8.90 x 10(-6) K-1 ranged from 323 to 373 K). The interfacial regulation and fracture mechanism were discussed in details.

• 单位
  Wuhan University of Technology