Pulsed electric current sintering of TiB2-based ceramics using nitride additives

Naeimeh Sadat Peighambardoust; Çağın Çevik; Tannaz Assar; Sunghoon Jung; Seon Yong Lee; Joo Hwan Cha

doi:10.53063/synsint.2021.1112

Naeimeh Sadat Peighambardoust ¹
Çağın Çevik ²
Tannaz Assar ³
Sunghoon Jung ⁴
Seon Yong Lee ⁵
Joo Hwan Cha ⁶

¹ Koç University Boron and Advanced Materials Applications and Research Center (KUBAM), Sariyer, Istanbul, 34450, Turkey
² Department of Biophysics, Istanbul University-Cerrahpasa, Istanbul, Turkey
³ Department of Geophysical Engineering, Istanbul Technical University, Istanbul, Turkey
⁴ Advanced Nano Surface Department, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea
⁵ Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea
⁶ Innovative Enterprise Cooperation Center, Korea Institute of Science & Technology, Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea

https://doi.org/10.53063/synsint.2021.1112

Abstract

In this research, various types of nitride additives were incorporated into titanium diboride attaining dense TiB₂-based ceramics by field-assisted sintering technique. The addition of different types of nitride additives, namely Si₃N₄, BN, AlN, and TiN, significantly improved the sinterability of TiB₂, achieving near fully dense ceramics. The X-ray diffraction analysis and microstructural evaluation confirmed the presence of the h-BN compound in all specimens. In the TiB₂-Si₃N₄ ceramic, Si₃N₄additive reacted with B₂O₃ oxide, in-situ generating h-BN, and SiO₂ phases. Although the h-BN phase was produced in the TiB₂-AlN specimen, the main proportion of AlN remained in the sample as an unreacted ex-situ phase. In terms of the TiB₂-TiN ceramic, some of the nitrogen and boron atoms could leave the TiN and TiB₂ crystalline structures, contributing to the in-situ formation of h-BN.

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Keywords: Titanium diboride, Silicon nitride, Hexagonal boron nitride, Aluminum nitride, Titanium nitride, Field assisted sintering technique

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