Wavelength selective radiator coating applied to thermophotovoltaic power generation device and preparation method

Abstract

The invention discloses a wavelength selective radiator coating applied to a thermophotovoltaic power generation device and a preparation method of the wavelength selective radiator coating. Firstly, erbium oxide powder and aluminum oxide powder are uniformly mixed, then mixed powder is obtained, grinding balls, a ball-milling liquid, the mixed powder and a dispersing agent are added to a ball-milling tank for ball milling, and uniformly dispersed slurry is obtained; the grinding balls in the slurry are filtered out, the ball-milling liquid in the slurry is dried, and dry powder is obtained; the dry powder is put in a high-temperature atmosphere furnace and heated, so that the erbium oxide powder and the aluminum oxide powder in the dry powder are sintered to form composite powder, the grinding balls, a binding agent and a diluent are added to the composite powder, the mixture is subjected to ball milling, the uniformly mixed slurry after ball-milling is dried, and then a die can be used for coating a substrate material; after the coated substrate material is dried and sintered at a high temperature, the wavelength selective radiator coating is formed and obtained. The mechanical performance and the surface strength of the coating are improved, the thermal stability of a coating radiator is improved, and the defect that the coating cannot be bonded to a ceramic substrate easily is overcome.

Description

technical field [0001] The invention belongs to the preparation technology of a selective radiator coating, in particular to a preparation method of a wavelength selective radiator coating applied to a thermal photovoltaic power generation device. Background technique [0002] The thermal photovoltaic power generation device converts the heat generated by various fuel combustion heat, waste heat, solar energy, radioactive isotope heat sources, etc., into infrared radiation energy through a thermal radiator, and the radiation energy is projected onto a thermal photovoltaic cell and converted into electrical energy installation. Thermal photovoltaic power generation devices have the advantages of strong fuel adaptability, no moving parts, easy maintenance, high power density, noiseless operation, and low radiation. The main problem lies in their low thermoelectric conversion efficiency. The key issue is how to convert heat radiation The wavelength of the radiation energy of t...

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Problems solved by technology

[L.G.Ferguson, F.Dogan.A highlyefficientNiO-DopedMgOmatcheddemitterforthermophotovoltaicenergyconversion.MaterialsScienceandEngineering.2001:35-41.] So far, although the researchers have made some attempts on the spectral control of thermal radiators, they have not developed a new method in terms of radiation performance and Coated radiators with good mechanical properties and other aspects have the following main problems: (1) During the preparation process of the coating, due to materials and procedures, etc., the components in the coating are likely to be uneven, the coating surface is easily broken, Problems such as poor bonding between thick coating and substrate

(2) Since radiators can be used in thermal photovoltaic systems of aerospace vehicles, the working environment temperature of coated radiators is above 1000°C for a long time, so its thermal stability is more difficult to guarantee than ordinary thermal photovoltaic radiators

(3) Coated radiators can be used in thermo-photovoltaic systems in the aerospace field, and provide stable power supply and improve system thermoelectric conversion efficiency. Therefore, in the conversion band of photovoltaic cells, the emissivity should be increased as much as possible, otherwise, outside the conversion band The emissivity should be reduced as much as possible. Based on the above practical application conditions, it is relatively difficult to control the spectrum of the coated radiators studied today, and the stability is difficult to be guaranteed.

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