Abstract
The Sr doped lanthanum manganite coatings were prepared using La 0.8Sr 0.2MnO 3 particles and epoxy modified polyurethane as pigment and resin matrix, respectively. The structure, morphology, surface roughness and infrared normal emissivity ( ɛ N ) in the 3–5 and 8–14 μm wavebands of the samples were systematically investigated. With the increase of La 0.8Sr 0.2MnO 3 pigment, the ɛ N of the coatings decreases and the ɛ N 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.
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