| Microstructure, Mechanical and Thermal Properties of
Hot-pressed TiB2 Ceramics with B4C and Phenolic Resin-
Derived Carbon Sintering Additives |
Minsu Heo,a,†Youngjun Oh,a,†Chang Hui Jeong,a Young-Wook Kim,a, b Hyun-Sik Kima,* and
Wook Ki Jungc
Pages: 34-41
DOI : 10.1080/0371750X.2025.2471479 |
| Abstract |
| TiB2 is a ceramic material known not only for its excellent thermal and mechanical
properties but also for its machinability via electrical discharge machining. However,
due to its low sinterability, the high sintering temperature required to achieve a fully
densified microstructure restricts the wide application of TiB2. Here, we used B4C and
phenolic resin-derived C (P.R.-C) as sintering additive to improve sinterability by
promoting grain refinement and providing pathways for the release of entrapped gas,
thereby achieving a dense microstructure. As a result, the finer microstructure enhanced
flexural strength and hardness while reducing thermal conductivity. The residual P.R.-C,
present after exceeding the required amount of C for carbothermal reduction, improved
the sinterability of TiB2 by inhibiting grain growth, resulting in enhanced densification.
Consequently, the fine-grained microstructure increased flexural strength and hardness,
reaching 567.7 MPa and 24.6 GPa at 2.5 wt% P.R.-C. However, the thermal conductivity
decreased due to the presence of residual P.R.-C, dropping to 91.6 W.m–1.K–1 at 3.0
wt% P.R.-C. This highlights the possibility for engineering the microstructure,
mechanical and thermal properties of TiB2 by incorporating P.R.-C. |
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