Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 119, Issue -, Pages 187-195Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2021.02.020
Keywords
(Zr,Ti)B-2; SPS; Solid solution; TEM; Nano-indentation
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2020M2D8A206983011]
- Basic Science Research Program through the National Research Foundation of Korea [2017R1A2B3009135]
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [104.05-2020.15]
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This study evaluated the influence of SiC addition on the microstructure development, mechanical characteristics, and densification behavior of (Zr,Ti)B-2-ZrC materials. The addition of SiC improved the relative density values and mechanical properties, leading to the formation of a solid-solution of (Zr,Ti)B-2.
This investigation aims to evaluate the influence of SiC introduction on the microstructure development, mechanical characteristics, and densification behavior of (Zr,Ti)B-2-ZrC materials. Two specimens, with/without SiC addition, were manufactured from the starting materials of ZrB2 and TiC by reactive spark plasma sintering (SPS) at 1800 degrees C under 30 MPa for 5 min. Both samples reached relative density values higher than 99%; however, the SiC addition improved this value by-0.5%, standing at 99.9%. The SiC incorporation into the (Zr,Ti)B-2-ZrC system led to an ultrahigh temperature ceramic (UHTC) with considerable hardness and elastic modulus. The TiC additive was completely consumed over the sintering process, participating in the in-situ formation of TiB2 and ZrC as a result of a chemical reaction with the ZrB2 matrix. Thanks to the diffusion of Ti and Zr atoms into the ZrB2 and TiB2 phases, respectively, a solid-solution of (Zr,Ti)B-2 formed with various compositions in different areas. Thanks to the synergistic effects of grain refinement and solid-solution formation, the (Zr,Ti)B-2-ZrC-SiC sample reached excellent mechanical properties such as an elastic modulus of 495 GPa and a hardness of 31.2 GPa. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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