Carbon nanotubes doped SiO₂/SiO₂–PbO double layer high emissivity coating
2011
Zhao, X. | He, X.D. | Sun, Y. | Wang, L.D.
Carbon nanotubes (CNTs) doped SiO₂/SiO₂–PbO double layer coating is prepared on Ni alloy plate by hybrid SiO₂ sol-gel method and SiO₂–PbO powders with certain heat treatment. The SiO₂–PbO top layer is observed to possess a kind of porous and skeleton-like structure. The emissivity enhancement mechanisms of the coating's structure and doping carbon nanotubes are investigated in this study. Spectral emissivity measurements from 1.28 to 25μm at 570 and 820K show that the carbon nanotubes doped SiO₂/SiO₂–PbO double layer coating possesses strong blackbody character and the coating's emissivity can reach as high as 0.94 at 820K.
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