Ni ion doped LaAlO3-based infrared radiation materials were synthesized with lanthanum nitrate, aluminum nitrate, and nickel nitrate as starting materials via sol?gel method. Infrared radiation coatings were then prepared on the surface of alumina ceramic substrate by spraying process with inorganic binders of aluminium dihydrogen phosphate, aluminum sol, silica sol and sodium silicate, respectively. The thermal stability of the powder was analyzed by thermogravimetri-differential thermal analyzer. The XRD, ultraviolet-visible-near-infrared spectrophotometer and dual-band IR-2 emissivity tester were used to study the crystalline phase, reflectance and the 3?5 ?m infrared emissivity of powder and coatings, respectively. The thermal shock resistance of the coatings were tested by air cooling. In addition, the effects of the binders on the phase composition，thermal stability and infrared emissivity of the coatings were also investigated. The results showed that Ni ion doping improved the performance of infrared absorption of LaAlO3 coatings, the infrared emissivity as high as 0.94 in the spectral region of 3?5 ?m, which was 161% higher than that of LaAlO3. The coatings had the least impurity phase in case of aluminum sol as binder and at the same time the coatings had the highest infrared emissivity and the best thermal shock resistance. The infrared emissivity of the coatings was as high as 0.95 and 0.93 in the band of 0.76?2.5 and 3?5 ?m respectively. Furthermore, the coatings also had good thermal shock resistance, it’s did not appear significantly peeling failure phenomenon after 50 thermal shocks. The coatings had a significant effect on enhanced radiation heat transfer, and the experimental energy saving rate reached 31.7%. This new type of high emissivity infrared radiation coatings had promising application in the field of thermal energy saving.
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