High-performance infrared radiation materials with excellent broadband emissivity, remarkable thermal stability, and scalable fabrication processes play a vital role in heat dissipation and energy-saving applications. However, current strategies of broadband emissivity enhancement remain inadequate. This study investigates the impact of LaPO4 morphology on the infrared radiation properties of composite coating. Three distinct morphologies (sphere, rod and mesh sheet) of LaPO4 are explored using a simulation-aided method. The composite coating filled with large-sized spherical LaPO4 particles with low diffuse reflection, exhibits a significantly enhanced infrared radiation capability, resulting in a broadband emissivity of 95.6 %. Furthermore, the composite coating achieves a large temperature reduction of 6.2 °C and high cooling efficiency of 11.9 % when subjected to a heating power of 2250 W/m2. This work provides an innovative strategy for regulating material emissivity through morphology control, benefiting advancements low-cost radiation heat transfer technology.

中文翻译：

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球形 LaPO4 的多重散射效应增强宽带发射率对电子设备散热的影响


高性能红外辐射材料具有优异的宽带发射率、卓越的热稳定性和可扩展的制造工艺，在散热和节能应用中发挥着至关重要的作用。然而，目前的宽带发射率增强策略仍然不足。本研究探讨了 LaPO4 形态对复合涂层红外辐射性能的影响。使用仿真辅助方法探索了 LaPO4 的三种不同形态 （球体、棒状和网状片材）。填充有低漫反射的大尺寸球形 LaPO4 颗粒的复合涂层，表现出显着增强的红外辐射能力，从而产生 95.6% 的宽带发射率。此外，当加热功率为 2250 W/m2 时，复合涂层实现了 6.2 °C 的大幅降温和 11.9% 的高冷却效率。这项工作提供了一种通过形态控制调节材料发射率的创新策略，有利于低成本辐射传热技术的进步。