High infrared emissivity energy-saving coatings based on LaMnO3 perovskite ceramics. Issue 14 (15th July 2022) - Han, Rifei
Abstract: In this preliminary work, a series of LaCrx Mn1-x O3 (x = 0, 0.25, 0.5, 0.75, 1) ceramic powders were initially synthesized by a facile solid-state reaction method. In the next step, high emissivity coatings were successfully papered by air-spraying using LaMnO3 powder as the filler material (with the highest emissivity ε3–5μm, 600 °C = 0.922) and phosphate as the binder phase. The morphology, structure, and infra-red emissivity of the samples were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), and infra-red emissometery. High-temperature cyclic heat treatment results showed that the prepared coating has very good adhesion and excellent high-temperature resistance. A simulated furnace heating test revealed that the prepared coating can save input energy as high as 13.2%. Graphical abstract: The coating exhibited excellent energy saving performance. Image 1 Highlights: LaCrx Mn1-x O3 ceramic powders were successfully prepared by solid-state reaction. Effect of B-site doping on the IR emissivity of the prepared powders was studied. High emissivity coatings were papered using LaMnO3 powder and phosphate binder. Prepared coating with high emissivity ε3–5 μm = 0.93 and ε8–14 μm = 0.94 at 600 °C. Prepared coatings showed good adhesion and excellent high-temperature resistance.