Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 19, Issue 3, Pages 266-270Publisher
SPRINGER
DOI: 10.1007/s12613-012-0549-7
Keywords
infrared radiation; coatings; plasma spraying; emissivity; crystal structure; industrial furnaces
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Air plasma spraying (APS) was used to produce high emissivity coatings with a NiCr2O4 spinet structure. The relationship between the emissivity and the crystal structure was investigated. X-ray diffraction (XRD) analyses show that NiCr2O4 spinet 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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