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Journal of Nanomaterials
Volume 2018, Article ID 1634814, 5 pages
Research Article

Nano-(Ta, Zr)C Precipitates at Multigrain Conjunctions in TaC Ceramic with 10 mol% ZrC and 5 mol% Cu as Sintering Aid

1School of Materials Science and Engineering, Harbin Institute of Technology, Xidazhi Street 91, Harbin 150001, China
2School of Materials Science and Engineering, North Minzu University, Wenchangbei Street 204, Yinchuan 750021, China

Correspondence should be addressed to Limeng Liu; moc.anis@186mll

Received 4 September 2017; Accepted 24 December 2017; Published 24 January 2018

Academic Editor: Leszek A. Dobrzański

Copyright © 2018 Lianbing Zhong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A fully dense TaC ceramic was prepared by hot pressing using 10 mol% ZrC plus 5 mol% Cu as a sintering aid. Formation of (Ta, Zr)C solid solution (ss) by reaction between TaC and ZrC facilitated densification. Addition of Cu refined the microstructure and consequently improved flexural strength of the TaC ceramics. TEM investigation found ubiquitous precipitation of nanocrystallites at multigrain conjunctions. The nanocrystallites were (Ta, Zr)C solid solution with uniform dispersion in an oxygen-rich glassy matrix. Although formation of nanoprecipitates may not much affect the mechanical properties of the TaC ceramic, the structure suggested a new type of nanoceramic worth further research.