High emissivity ceramic coating with high temperature corrosion resistance and preparation method thereof

The invention provides a high emissivity ceramic coating with high temperature corrosion resistance and preparation method thereof, and belongs to the technical field of special coatings. The ceramic coating comprises the following ingredients by mass percentage: 18-22% of filling materials, 20-30% of binders and balance being water, wherein the filling materials comprises 3-4% of titanium dioxide, 4-5% of silica, 4-4.5% of graphite, and 1-1.5% of cerium oxide. The preparation method is as follows: adding water in the binders, stirring until the binder and the water are uniform, adding the filling materials in the binder liquid, wherein the filling materials is subjected to a thinning processing and the size ranges from 500 to 1000nm, then adding half of adjuvant and stirring until the adjuvant is uniform, grinding by a planetary bowl mill for one hour and adding the other half of adjuvant, continuing grinding until the size of the ceramic materials ranges from 200 to 700nm, then filtering and packaging. The coating can be applied on the heating surface of the boiler water screen and superheater, and the coating can be cured by high temperature and forms a dense ceramic coating which effectively alleviates high temperature corrosion of heating surface, increases emissivity of the heating surface, enhances heat exchange effects and promotes boiler efficiency.