Catalyst-free in situ synthesis of ZrC nanowires with excellent thermal stability

Ningning Yan, Qiangang Fu, Kun Li, Dou Hu, Wei Xie, Weiyan Wang, Yuyu Zhang, Lei Zhuang, Lei Zhou, Jiaping Zhang, Xiaohong Shi

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

No catalyst-assisted zirconium carbide nanowires (ZrCNWs) were successfully synthesized by thermal evaporation and in situ reaction using carbon nanotubes (CNTs) and ZrCl4 as carbon and zirconium sources. Vapor-Solid (VS) mechanism was proposed to explain the growth process of ZrCNWs. The ZrCNWs prepared at 1400°C have a single crystal structure with the diameters of 130-290 nm. The axial growth direction of ZrCNWs is [111] and the yield is 76.5 wt%. After heat treatment at 1700°C, 2100°C, and 2450°C, the diameter of ZrCNWs increased and their aspect ratio decreased. By simulating the thermal stress of a single ZrCNW, it is speculated that the coarsening and fracture of ZrCNWs are caused by the overall slip of the atomic layers and the stress concentration at the dislocations.

Original languageEnglish
Pages (from-to)5825-5836
Number of pages12
JournalJournal of the American Ceramic Society
Volume103
Issue number10
DOIs
StatePublished - 1 Sep 2020

Keywords

  • high temperature stability
  • residual thermal stress
  • structural transformation
  • thermal evaporation
  • ZrC nanowires

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