J. Mater. Sci. Technol. ›› 2023, Vol. 144: 219-223.DOI: 10.1016/j.jmst.2022.10.033

• Research Article • Previous Articles     Next Articles

Capillary infiltration of liquid silicon in carbon nanotubes: A molecular dynamics simulation

Kangyu Zhanga,b, Rida Zhaoa,b, Yongqiang Yanga,b, Lichang Yina,b,c, Sufang Tanga,b   

  1. aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    cDepartment of Physics and Electronic Information, Huaibei Normal University, Anhui, Huaibei 235000, China
  • Received:2022-05-16 Revised:2022-08-17 Accepted:2022-10-25 Published:2023-05-01 Online:2022-12-05
  • Contact: * E-mail addresses: lcyin@imr.ac.cn (L. Yin), sftang@imr.ac.cn (S. Tang).

Abstract: In this work, by simplifying the nanopores of porous C/C preform with single-walled carbon nanotubes (SWCNT) or double-walled carbon nanotubes (DWCNTs), the infiltration of liquid Si in the SWCNTs and DWCNTs was studied by molecular dynamics (MD) simulations. As a result, a quantitative relationship between tube diameter and liquid Si infiltration rate was established, which has been successfully applied to reproduce the available experiment result. The obtained relationship indicates that the capillary infiltration of liquid Si at the nanoscale still conforms to the classic Lucas-Washburn law, however, the liquid Si infiltration quickly stops in small tubes with a diameter of less than 3 nm due to an obvious contraction of the tube wall. This work may provide theoretical guidance for pore structure optimization of porous C/C preform to fabricate high-density C/SiC composites.

Key words: Silicon carbide, Molecular dynamics, Capillary infiltration, Liquid silicon, Carbon nanotube