Nano ceramic coating with high emissivity

Abstract

The invention discloses a nano ceramic coating with high emissivity, which is prepared from a high temperature resistant basic material, an additive with high emissivity, a binder, a stabilizing agent and a solvent. The high temperature resistant basic material and the additive with high emissivity are one or several of alumina, silicon oxide, boron nitride, silicon carbide, ferric oxide and cerium oxide. The binder is one or several of silica gel, potassium silicate solution, aluminium phosphate solution, silicon oxide hydrate, ethanol and water. By weight percentage, the high temperature resistant basic material and the additive with high emissivity account for 5-78%, the binder accounts for 5-30%, the stabilizing agent accounts for 0.5-3% and the balance of solvent is water. The coating which can be used above 1300 DEG C has the advantages of being wide in work temperature range with the maximum service temperature close to 2000 DEG C, applicable to various base materials, strong in adhesive force to the base materials, applicable to reaction atmosphere, good in long-time durability and strong in heat shock endurance, improving thermal efficiency, lowering temperature of the base materials, and being excellent in abrasion and corrosion resistance, less in impact on environment, convenient to use and the like.

Description

technical field [0001] The invention relates to a ceramic coating, more precisely, to a high-emissivity nano-ceramic coating which can improve the thermal efficiency of a furnace, and can be applied to petroleum, chemical industry, metallurgy, electric power, other industries and civil kilns, boilers, etc. Background technique [0002] Ceramic coatings have been applied in many industries. It can be used as a refractory material on the heat-absorbing surfaces of various industrial furnaces and civil boilers. Using the principle of high absorption rate and high emissivity of the coating to heat radiation, it can improve the furnace life. It can improve the heat exchange condition of the furnace by improving the absorption of the heat of the furnace flame by the boiler tube wall, reducing the heat dissipation of the furnace body and increasing the thermal efficiency. Long service life and reduce maintenance workload. In addition, by strengthening the radiation heat transfer i...

AI Technical Summary

Problems solved by technology

However, when the coating is applied to a higher temperature, or when it is used in a reactive atmosphere for a long time, the performance of the coating will be greatly affected, and the efficiency of the coating will decrease or even fail.