Abstract
In order to enhance the infrared emission property, a NiCr spinel coating was synthesized via the air plasma spraying method, and doped with MnO2 and rare-earth oxides (CeO2, Pr6O11, and Tb4O7). The obtained coating had a thickness of approximately 150–200 μm with a typical laminated structure. The deposited coating was composed of mainly a mixture of NiCr2O4 and NiCrMnO4. Compared with the non-doped NiCr spinel coating, doping MnO2 and rare-earth oxides could effectively improve the infrared emissivity in the wavelength ranges of 2.5–8 μm and 15–25 μm, owing to the charge transfer transitions in NiCrMnO4 spinel and the lower symmetry of lattice vibration. The prepared infrared radiation coating showed a considerably high total emissivity of 0.917 in the wavelength range of 2.5–25 μm at 1000 °C. Further, good thermal shock resistance was confirmed, as micro-cracks only appeared in the coating after 37 thermal cycles with air-cooling from 1000 °C to 25 °C.
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