Abstract
The impact of high-energy milling using WC[sbnd]Co media on the pressureless sintering and properties of TiB2 was studied. After 30 mins of milling, samples sintered at 2200 °C achieved a high relative density (>98 %) and a fine mean grain size (<2 >µm). In the microstructure WxBy phases, often containing Co, were observed at triple points, due to contamination from the milling media. Moreover, core-rim structures with multiple rims were detected: the cores consisted of pure TiB2 grains, the rims were (TixWy)B2 solid solutions. The core-rim formation was significantly more pronounced compared to a reference sample of the same powder mixture densified by hot pressing at 1900 °C. The hardness reached 23 GPa, comparable to the hot-pressed sample, while the fracture toughness remained within 4.8–5.1 MPa·m1/2 up to 1000 °C. The strength was approximately 350–400 MPa up to 1000 °C, declining sharply at higher temperatures due to W-containing impurities. Thermal diffusivity and conductivity were similarly impacted by these impurities.
Recommended Citation
S. Taraborelli et al., "Thermomechanical and Thermal Characterization of Pressureless Sintered TiB2," Open Ceramics, vol. 22, article no. 100754, Elsevier, Jun 2025.
The definitive version is available at https://doi.org/10.1016/j.oceram.2025.100754
Department(s)
Materials Science and Engineering
Publication Status
Open Access
Keywords and Phrases
Armour materials; Hardness; High-energy milling; Pressure-less sintering; Strength
International Standard Serial Number (ISSN)
2666-5395
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Jun 2025
Comments
JECS Trust, Grant 2023352