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 flowability,was acquired by heat treatment from the particles at 1200-C in the reducing atmosphere.Dark and uniform coating of More than 50μm 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 600-C by infrared radiation testing.The X-ray diffraction analysis shows that the formation of(Cr0.88Ti0.12)2O3 and spinel structural NiCr2O4 in the coating is the main reason for high effcient infrared radiation,and the phase structure and performance of coating is favorable under the thermal cycle between room temperature and 600-C.
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