Synthesis of NiCr₂O₄ spinel coatings with high emissivity by plasma spraying

Zhen-qi Zhu1),Xu-dong Cheng2),Wei-ping Ye1),and Jie Min2)1) School of Materials Science and Technology,Wuhan University of Technology,Wuhan 430070,China2) State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

摘 要：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.

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