Selective Solar Absorber Having a Thick Corrosion-Resistant Passivation and Thermal Barrier Layer for High Temperature Applications and its Process of Preparation

摘要

A selective solar thermal absorber capable of operating at high temperatures in a corrosive environment, including, successively stacked, a substrate, a selective solar coating, configured in order to absorb a large part of the solar radiation while re-emitting as little as possible of thermal infrared radiation at high temperatures when it is not corroded, and a corrosion-resistant barrier layer. The corrosion-resistant barrier layer is a thick passivation layer which is thermally stable, which has a low optical refractive index and which is optically transparent to solar radiation, the thickness being adjusted as a function of the operating temperature and of the effectiveness of the third material in order to prevent the diffusion of constituent components of the corrosive environment.

主权项

1. Selective solar thermal absorber capable of operating at high temperatures in a corrosive environment, comprising, successively stacked:
a substrate composed of a first material, a selective solar coating composed of a second material, a corrosion-resistant barrier layer composed of a third material, characterized in that: the corrosion-resistant barrier layer is a passivation layer having an optical refractive index of less than or equal to 2 over the range of wavelengths between 0.3 μm and 10 μm and being transparent to the radiation of the solar spectrum for which the wavelength is between 0.3 μm and 2.5 μm, and in that the thickness of the said corrosion-resistant barrier is greater than or equal to 0.5 μm.