Infrared emissivity of Sr doped lanthanum manganites in coating form

The Sr doped lanthanum manganite coatings were prepared using La0.8Sr0.2MnO3 particles and epoxy modified polyurethane as pigment and resin matrix, respectively. The structure, morphology, surface roughness and infrared normal emissivity (ɛN) in the 3–5 and 8–14 μm wavebands of the samples were systematically investigated. With the increase of La0.8Sr0.2MnO3 pigment, the ɛN of the coatings decreases and the ɛN values in the 8–14 μm waveband are higher than those in the 3–5 μm waveband. The surface roughness has no significant effect on the infrared emissivity of LSMO coatings. For 50% LSMO coating, the sample shows variable-emissivity property in the 8–14 μm waveband and the emissivity property remains unchanged before and after ultraviolet irradiation.

► LSMO and epoxy modified polyurethane as pigment and resin matrix, respectively.
► The ɛN of the coating decreases with the increase of LSMO.
► Surface roughness has no significant effect on the emissivity of the coating.
► Variable-emissivity property of the coating remains unchanged before and after ultraviolet irradiation.