Abstract Scope |
Ultra-high temperature ceramics (UHTC) are critical for thermal protection applications, particularly due to their high thermal conductivity. However, porosity and impurities significantly affect this property. This study utilizes the CALPHAD (Calculation of Phase Diagrams) method to model the thermal conductivity of ZrB2 as a key UHTC material, incorporating both porosity and common impurities. The effectiveness of various models, including Parallel and Maxwell-Eucken, for calculating effective thermal conductivity is evaluated. The influence of inherent impurities and atmosphere on thermal conductivity of ZrB2 is also estimated. This approach provides a valuable tool for predicting the effective thermal conductivity of UHTC materials with a certain level of porosity and impurity, critical for designing reentry vehicles operating at hypersonic speeds. |