Wavelength Selective Radiator Coating Applied to Thermal Photovoltaic Power Generation Devices and Preparation Method

Abstract

The invention discloses a wavelength selective radiator coating applied to a thermal photovoltaic power generation device and a preparation method thereof. First, erbium oxide and alumina powder are uniformly mixed to obtain a mixed powder, and grinding balls, ball milling liquid, mixed powder and The dispersant is added to the ball mill and ball milled to obtain a uniformly dispersed slurry; the grinding balls in the slurry are filtered, and the ball milling liquid in the slurry is dried to obtain dry powder; the dry powder is placed in a high-temperature atmosphere furnace, and the temperature is raised to make the dry powder The erbium oxide and alumina powders in the sintering process are sintered into composite powders, and the composite powders are added to grinding balls, binders and diluents in a ball-milling jar, and the mixed slurry after ball milling is dried. The material is coated; after the coated base material is dried, it is sintered at a high temperature to obtain a wavelength-selective radiator coating. The invention improves the mechanical properties of the coating, the surface strength and the thermal stability of the coating radiator, and overcomes the defect that the coating is difficult to bond with the ceramic substrate.

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...

AI Technical Summary

Problems solved by technology

[L.G.Ferguson, F.Dogan. A highly efficient NiO-Doped MgO matched demitter for thermophotovoltaic energy conversion. Materials Science and Engineering. 2001: 35-41.] Until now, although researchers have done some research on the spectral control of thermal radiators Attempts have been made, but a coating radiator with good performance in radiation performance and mechanical performance has not been developed. The main problems are: (1) During the preparation process of the coating, due to reasons such as materials and procedures, it is easy to cause internal composition of the coating. Problems such as uneven distribution, fragile coating surface, poor bonding between thick coating and substrate, etc.

(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.

Images