Solar spectrum selective absorbing coating and preparation method thereof

Abstract

The invention relates to a solar spectrum selective absorbing coating which is prepared by adopting magnetron sputtering technology. The absorber of the coating comprises the following three layers of films from substrate to top: a first layer adopts copper with infrared reflectivity or aluminium substrate as an infrared reflecting layer; a second layer uses a metalloid layer and a medium type layer which have different refractive indexes and thicknesses; and a third layer uses SiON film as an antireflection layer. The preparation method comprises the following steps: the first layer (infrared reflecting layer): cleaning copper or aluminium sheets with ultrasonic wave or polishing the copper or aluminium sheets; the metalloid layer of second layer: using two metals as alloy target, argon gas as sputtering gas and nitrogen gas as reaction gas and adopting DC electrical source to perform reactive sputtering; the medium type layer of the second layer: using two metals as alloy target, argon gas as sputtering gas and nitrogen and oxygen gas as reaction gas and adopting DC electrical source to perform reactive sputtering; the third layer (antireflection layer): uses SiN as target, argon gas as sputtering gas and nitrogen and oxygen gas as reaction gas and adopting radio frequency power source to perform reactive sputtering; and finally obtaining the absorber.

Description

Technical field: [0001] The invention relates to the field of solar light-to-heat conversion, in particular to a medium-high temperature solar spectrum selective absorption coating and its preparation technology. Background technique: [0002] Along with the increasingly severe energy and environmental problems, the utilization of solar energy has become a research hotspot of governments in various countries. Among them, the photothermal conversion of solar energy is a part of solar energy utilization that has relatively optimistic application feasibility and prospects but relatively weak research (there are three forms of solar energy utilization : Photo-electricity, i.e. solar cells; photo-chemistry, i.e. photocatalysis; photo-thermal, direct use of solar heat radiation). [0003] The core material to realize solar photothermal conversion is the solar spectrum selective absorption coating, which has a high absorption rate (α) at ​​0.3-2.5 μm, and has a low emissivity in th...

AI Technical Summary

Problems solved by technology

[0005] The development of today's society has higher requirements for the comprehensive performance of materials. For the medium and high temperature application of solar absorbing coatings, a single high absorption rate, low emissivity or thermal stability index can no longer meet the demand. New materials with performance, appearance, and environmental compatibility

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