Microstructure, chromaticity and thermal stability of SS/TiC-WC/Al2O3 spectrally selective solar absorbers

High-Entropy Alloy Nitride AlMo0.5NbTa0.5TiZrNx-Based High-Temperature Solar Absorber Coating: Structure, Optical Properties, and Thermal Stability

“…The reflectance spectra in the range of 2.5–25 μm were measured with a Bruker Tensor 27 FT-IR spectrometer. Subsequently, α S and ε can be calculated from the reflectance spectra measured at room temperature according to the following equations: where I s (λ), I b ( λ , T ), and A ( θ , λ ) are the spectral power (AM 1.5 G), blackbody emission at a temperature of 355 K and spectral absorption at wavelength λ .…”

“…3 In particular, for these transition metal nitrides, there are important prospects in the potential spectral selectivity from ultraviolet (UV) to nearinfrared (NIR) region, which is closely related to the contribution of in-band or Drude and interband or Lorentz according to the rigid band model of atomic electronic structure. 4,5 The applications of SSACs are based on different physical principles, i.e., the desired optical properties, thermal stability characteristics, a proper sputtering threshold, and a low level of erosion or a combination of them.…”

“…Currently, the requirements of advanced SSAC materials have turned researchers’ attention toward transition metal nitride ceramics due to their excellent high-temperature applications, especially the favorable combination of chemical and structural stability in rigorous high-temperature service environments . In particular, for these transition metal nitrides, there are important prospects in the potential spectral selectivity from ultraviolet (UV) to near-infrared (NIR) region, which is closely related to the contribution of in-band or Drude and interband or Lorentz according to the rigid band model of atomic electronic structure. , The applications of SSACs are based on different physical principles, i.e., the desired optical properties, thermal stability characteristics, a proper sputtering threshold, and a low level of erosion or a combination of them.…”

Highly-dispersed nickel nanoparticles decorated titanium dioxide nanotube array for enhanced solar light absorption

“…The light absorption abilities of the Ni-NPs@TiO2-NTA samples were measured via spectrophotometers with an integrating sphere and evaluated by absorptance and reflectance. The weighted solar absorptance (α) was calculated according to the measured reflection spectrum and standard solar radiation spectrum by the following equations [43]:…”

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

“…The preparation of high-temperature coating is mostly made by magnetron sputtering, mainly using metal particles as the absorption units in metal-dielectric cermet coatings, such as Cu/TiNxOy/TiO2/Si3N4/SiO2 [15], Pt/AlxOy [16], AlyTi1−y(OxN1−x) [17], AlCrSiN/AlCrSiON/AlCrO [18], etc., which have excellent optical characteristics and thermal stability [19]. However, the use of oxygen to prepare oxide or nitrogen oxide coatings can cause the oil in the vacuum pump to oxidize [17,20], reducing its pumping speed and service life, and even affecting product quality and production efficiency [21].…”