Preparation, Microstructure and Properties of NiO-Cr2O3-TiO2 Infrared Radiation Coating
Xudong Cheng,Wei Duan,Fang Mao
Journal of Materials Sciences & Technology (J. Mater. Sci. Technol.)
abstract
The spherical agglomerated particles were fabricated by spray drying with the powders of NiO, Cr2O3 and TiO2. Plasma spray power, which has good property of owability, was acquired by heat treatment from the particles at 1200C in the reducing atmosphere. Dark and uniform coating of More than 50 m thick was deposited on the copper sheet substrate by plasma spraying. It is found that the infrared normal total emissivity of the coating is up to 0.91 at 600C by infrared radiation testing. The X-ray diraction analysis shows that the formation of (Cr0 Ti0 ) O and spinel structural NiCr2O4 in the coating is the main reason .88 .12 2 3 for high ecient infrared radiation, and the phase structure and performance of coating is favorable under the thermal cycle between room temperature and 600C.
keywords:Spray drying; Agglomerated particles; Plasma spraying; Normal total emissivity
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