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Air plasma spraying(APS) was used to produce high emissivity coatings with a NiCr2O4 spinel structure.The relationship be-tween the emissivity and the crystal structure was investigated.X-ray diffraction(XRD) analyses show that NiCr2O4 spinel has been fabri-cated with the space group Fd3m.Scanning electron microscope(SEM) photographs show that the coating consists of a laminated structure with homogeneous grains and high porosity because of the unique feature of plasma spraying.The emissivity measurement and Fourier transformation infrared radiation(FT-IR) spectra show that NiCr2O4 has a high emissivity of about 0.91 because of its special spinel structure.APS is a suitable method to produce high emissivity coatings.
Air plasma spraying (APS) was used to produce high emissivity coatings with a NiCr2O4 spinel structure. The relationship be-tween the emissivity and the crystal structure was investigated. X-ray diffraction (XRD) analyzes that that NiCr2O4 spinel has been fabri-cated with the space group Fd3m. Scanning electron microscope (SEM) photographs show that the coating consists of a laminated structure with homogeneous grains and high porosity because of the unique feature of plasma spraying. The emissivity measurement and Fourier transformation infrared radiation (FT-IR) spectra show that NiCr2O4 has a high emissivity of about 0.91 because of its special spinel structure. APS is a suitable method to produce high emissivity coatings.