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Abstract

Air plasma spraying (APS) was used to produce high emissivity coatings with a NiCr2O4 spinel structure. The relationship between the emissivity and the crystal structure was investigated. X-ray diffraction (XRD) analyses show that NiCr2O4 spinel has been fabricated 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.

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Correspondence to Zhen-qi Zhu.

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Zhu, Zq., Cheng, Xd., Ye, Wp. et al. Synthesis of NiCr2O4 spinel coatings with high emissivity by plasma spraying. Int J Miner Metall Mater 19, 266–270 (2012). https://doi.org/10.1007/s12613-012-0549-7

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  • DOI: https://doi.org/10.1007/s12613-012-0549-7

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