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Microstructural and nanoindentation study of TaN incorporated ZrB2 and ZrB2-SiC ceramicsopen access

Authors
Delbari, Seyed AliNamini, Abbas SabahiLee, SeonyongJung, SunghoonWang, JinghanLee, Sea-HoonCha, Joo HwanCho, Jin HyukJang, Ho WonKim, Soo YoungShokouhimehr, Mohammadreza
Issue Date
12-8월-2022
Publisher
NATURE PORTFOLIO
Citation
SCIENTIFIC REPORTS, v.12, no.1
Indexed
SCIE
SCOPUS
Journal Title
SCIENTIFIC REPORTS
Volume
12
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/143780
DOI
10.1038/s41598-022-17797-6
ISSN
2045-2322
Abstract
This study assessed the sinterability and microstructure of ZrB2-SiC-TaN and ZrB2-TaN ceramics. Spark plasma sintering at 2000 degrees C and 30 MPa for 5 min produced both ceramics. The relative density of ZrB2 ceramic containing TaN was 95.3%; the addition of SiC increased this value to 98.1%. SiC's contribution to the elimination of ZrB2 surface oxides was the primary factor in the advancement of densification. The in situ formation of hexagonal boron nitride at the interface of TaN and ZrB2 was confirmed by high-resolution transmission electron microscopy, field emission-electron probe microanalyzer, X-ray diffractometry, and field emission scanning electron microscopy. Moreover, the in situ graphite might be produced as a byproduct of the SiC-SiO2 process, hence boosting the reduction of oxide compounds in the ternary system. The SiC compound had the highest hardness (29 +/- 3 GPa), while the ZrB2/TaN interface exhibited the greatest values of elastic modulus (473 +/- 26 GPa) and stiffness (0.76 +/- 0.13 mN/nm).
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공과대학 (신소재공학부)
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