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Catalyst‐free in situ synthesis of ZrC nanowires with excellent thermal stability
Author(s) -
Yan Ningning,
Fu Qiangang,
Li Kun,
Hu Dou,
Xie Wei,
Wang Weiyan,
Zhang Yuyu,
Zhuang Lei,
Zhou Lei,
Zhang Jiaping,
Shi Xiaohong
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17206
Subject(s) - materials science , zirconium carbide , zirconium , thermal stability , catalysis , nanowire , carbon fibers , carbide , chemical engineering , evaporation , slip (aerodynamics) , carbon nanotube , composite material , nanotechnology , metallurgy , chemistry , composite number , organic chemistry , physics , engineering , thermodynamics
No catalyst‐assisted zirconium carbide nanowires (ZrCNWs) were successfully synthesized by thermal evaporation and in situ reaction using carbon nanotubes (CNTs) and ZrCl 4 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.