Mechanical and electrical properties of carbon nanofibers reinforced aluminum nitride composites prepared by plasma activated sintering

作者：Shi, Zhongqi^*; Chen, Shugang; Wang, Jiping; Qiao, Guanjun; Jin, Zhihao

来源：Journal of the European Ceramic Society, 2011, 31(12): 2137-2143.

DOI：10.1016/j.jeurceramsoc.2011.05.011

• Carbon nanofibers
• B. Composites
• C. Mechanical properties
• C. Electrical properties
• A. Sintering

High density carbon nanofibers (CNFs) reinforced aluminum nitride (AlN) composites were successfully fabricated by plasma activated sintering (PAS) method. The effects of CNFs on the microstructure, mechanical and electrical properties of the AlN composites were investigated. The experimental results showed that the grain growth of AlN was significantly inhibited by the CNFs. With 2 wt.% CNFs added into the composites, the fracture toughness and flexural strength were increased, respectively to 5.03 MPa m(1/2) and 354 MPa, which were 20.9% and 13.4% higher than those of monolithic AlN. The main toughening mechanisms were CNFs pullout and bridging, and the main reason for the improvements in strength should be the fine-grain-size effect caused by the CNFs. The DC conductivity of the composites was effectively enhanced through the addition of CNFs, and showed a typical percolation behavior with a very low percolation threshold at the CNFs content of about 0.93 wt.% (1.51 vol.%).

• 出版日期2011-10-15
• 单位西安交通大学