Elevated temperature thermal properties of ZrB2-B4C ceramics. Issue 9 (August 2022)

• Record Type: Journal Article
• Authors: Neuman, Eric W.; Thompson, Matthew; Fahrenholtz, William G.; Hilmas, Gregory E.
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 9(2022)
• Page Start: 4024
• Page End: 4029
• Publication Date: 2022-08
• Subjects: Zirconium diboride -- Boron carbide -- Thermal conductivity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.03.029
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: 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 B4 C 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% B4 C. 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% B4 C. 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% B4 C. 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% B4 C was added.