Titanium carbide-zirconium carbide high-temperature solar selective absorbing coating and preparation method thereof

Abstract

The invention discloses a titanium carbide-zirconium carbide high-temperature solar selective absorbing coating and a preparation method thereof. The coating comprises a heat absorbing body substrate, an absorbing layer and an antireflection layer sequentially from the bottom layer to the surface. The material of the absorbing layer is a compound of titanium carbide and zirconium carbide, is prepared through double target co-sputtering and is 35-80 nm in thickness. The percentage of zirconium atoms in the compound is 0.5%-3%. The antireflection layer is aluminum oxide and 30-100 nm in thickness. The coating prepared through the preparation method is larger than or equal to 0.90% in absorptivity and smaller than or equal to 0.13 in emissivity under the condition of the atmospheric quality factor being AM 1.5. The coating has very good high-temperature stability and corrosion resistance. The coating provided by the invention has the characteristics of high absorptivity , low emissivity, good high-temperature stability and corrosion resistance and the like. According to the coating, the preparation process is simple, the source of raw materials is wide, the piece is low, operation is convenient, and control is easy. The coating has high practical value and wide application prospects in the fields of solar heat utilization and thermal power generation.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation and vacuum coating, relates to a high-temperature solar energy selective absorption coating and a preparation method thereof, is one of the key technologies of solar thermal power generation at present, and specifically relates to a titanium carbide-zirconium carbide high-temperature solar energy selective coating Absorbent coating and method of making same. Background technique [0002] Solar thermal power generation technology refers to the use of large-scale arrays of parabolic or dish-shaped mirrors to collect solar heat, provide steam through heat exchange devices, and combine traditional turbogenerator technology to achieve the purpose of power generation. The use of solar thermal power generation technology avoids the expensive silicon crystal photoelectric conversion process, which can greatly reduce the cost of solar power generation. Moreover, this form of solar e...

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Problems solved by technology

However, for metal-ceramic composite systems, since the metal particles in the system are prone to oxidation, diffusion, and agglomeration at high temperatures, the optical properties of the absorbing coating will decrease or even fail after long-term service at high temperatures.

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