Elevated Temperature Thermal Properties of ZrB₂-B₄C Ceramics
The elevated temperature thermal properties of zirconium diboride ceramics containing boron carbide additions of up to 15 vol% were investigated using a combined experimental and modeling approach. The addition of B4C led to a decrease in the ZrB2 grain size from 22 µm for nominally pure ZrB2 to 5.4 µm for ZrB2 containing 15 vol% B4C. The measured room temperature thermal conductivity decreased from 93 W/m·K for nominally pure ZrB2 to 80 W/m·K for ZrB2 containing 15 vol% B4C. The thermal conductivity also decreased as temperature increased. For nominally pure ZrB2, the thermal conductivity was 67 W/m·K at 2000 °C compared to 55 W/m·K for ZrB2 containing 15 vol% B4C. A model was developed to describe the effects of grain size and the second phase additions on thermal conductivity from room temperature to 2000 °C. Differences between model predictions and measured values were less than 2 W/m·K at 25 °C for nominally pure ZrB2 and less than 6 W/m·K when 15 vol% B4C was added.
E. W. Neuman et al., "Elevated Temperature Thermal Properties of ZrB₂-B₄C Ceramics," Journal of the European Ceramic Society, vol. 42, no. 9, pp. 4024 - 4029, Elsevier, Aug 2022.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2022.03.029
Materials Science and Engineering
Keywords and Phrases
Boron Carbide; Thermal Conductivity; Zirconium Diboride
International Standard Serial Number (ISSN)
Article - Journal
© 2022 Elsevier, All rights reserved.
01 Aug 2022