Effects of Ti, Y, and Hf Additions on the Thermal Properties of ZrB₂
Reactive hot pressing was utilized to synthesize and densify four ZrB2 ceramics with impurity contents low enough to avoid obscuring the effects of dopants on thermal properties. Nominally pure ZrB2 had a thermal conductivity of 141 ± 3 W/m K at 25 °C. Additions of 3 at% of Ti, Y, or Hf decreased the thermal conductivity by 20 %, 30 %, and 40 %, respectively. The thermal conductivity of (Zr,Hf)B2 was similar to ZrB2 synthesized from commercial powders containing the natural abundance of Hf as an impurity. This is the first study to demonstrate that Ti and Y additions decrease the thermal conductivity of ZrB2 2 ceramics and report intrinsic values for thermal conductivity and electrical resistivity of ZrB2 containing transition metal additions. Previous studies were unable to detect these effects because the natural abundance of Hf present masked the effects of these additions.
A. D. Stanfield et al., "Effects of Ti, Y, and Hf Additions on the Thermal Properties of ZrB₂," Journal of the European Ceramic Society, Elsevier Ltd, Apr 2020.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2020.04.011
Materials Science and Engineering
Keywords and Phrases
Electrical resistivity; Solid solution; Thermal conductivity; Ultra high temperature ceramics; Zirconium diboride
International Standard Serial Number (ISSN)
Article - Journal
© 2020 Elsevier Ltd, All rights reserved.
24 Apr 2020