A high-temperature high-emissivity infrared radiation coating and its preparation method and application method

Abstract

The invention relates to a high-temperature and high-emissivity infrared radiation coating, a preparation method and a use method thereof. The technical scheme is as follows: the CuO-doped magnesia-chromium spinel fine powder, silicified expanded graphite, Guangxi white mud, elemental silicon powder, glass powder, silica sol, glycerol and citric ammonium nitrate are mixed with a planetary ball mill to obtain high temperature and high emission. rate infrared radiation coatings. The use method of the high-temperature and high-emissivity infrared radiation coating is as follows: by brushing or spraying, the high-temperature and high-emissivity infrared radiation coating is evenly coated on the surface of the industrial furnace wall, air-dried, and dried at 110-700 °C. Heat treatment under the condition of ℃ for 1 to 4 hours to obtain a high temperature and high infrared radiation coating. The invention has the advantages of low cost, simple process and convenient spraying, and has the characteristics of high infrared radiation rate in the 1-5 μm band and long service life in industrial furnaces above 1000° C. and without air isolation.

Description

technical field [0001] The invention belongs to the technical field of high-temperature and high-emissivity infrared radiation coatings. In particular, it relates to a high-temperature and high-emissivity infrared radiation coating and its preparation method and application method. Background technique [0002] The energy consumption of industrial furnaces used in high-temperature industries is huge. Among the high-temperature energy generated by the heat source of industrial furnaces, workpieces or products are heated mainly through two heat transfer methods: heat convection and heat radiation. In a high-temperature industrial environment greater than 800°C, the theoretical proportion of radiation heat transfer is more than 80% among the three heat transfer methods (radiation, convection, and conduction). Especially for high-temperature flame furnaces with large actual consumption and high energy consumption, the form of radiation heat transfer is the absolute dominant for...

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Problems solved by technology

However, nanopowders are easy to grow or react with impurities in the use environment at high temperatures, and their emissivity decays quickly at high temperatures

[0006] "A high-performance infrared radiation coating for industrial kilns" (CN201710706569.3). Although the infrared radiation coating prepared by this technology has a high infrared radiation rate and a high refractory temperature, most industrial kilns are very It is difficult to isolate the air. The graphene in the infrared radiation coating is very easy to oxidize, and once oxidized, its emissivity drops rapidly; and BN in the infrared radiation agent is also very easy to oxidize in high-temperature air, and its oxidation products and SiO 2 , Mn 2 o 3 , Fe 2 o 3 Such components are very easy to react to form a low-melting liquid phase, resulting in a very short effective working time of the infrared radiation coating at high temperatures

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