High infrared radiation-cum-low thermal conductivity Cu-modified SrZrO3 ceramics as potential thermal blocking material

High-infrared-radiation materials play a crucial role in thermal protection and industrial energy conservation. A series of Cu-doped SrZrO3 high infrared radiation perovskite ceramic were prepared. The effects of Cu ion doping on infrared radiation and thermophysical properties were investigated through both experimental and theoretical approaches. The results indicate that doping with Cu ions can enhance the infrared emissivity of SrZrO3. Furthermore, the introduction of oxygen vacancies and the expansion of lattice volume help alleviate the increase in thermal conductivity associated with electronic thermal conduction. The synthesized SrZr 0.75 Cu 0.25 O 3-delta bulk ceramic demonstrates an emissivity exceeding 0.98 in the 1-22 mu m range at 600 degrees C and greater than 0.5 at 1200 degrees C. Additionally, it has a thermal conductivity of less than 1.8 W center dot m-1 center dot K- 1 at 1200 degrees C. The ceramic also exhibits a temperature isolation value greater than 40 degrees C center dot mm- 1 at 1200 degrees C, indicating an improvement of over 55 % compared to SrZrO3.