|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Comparison of AlN and TiN Solar Selective Absorber Coatings
||Iman El Mahallawi, Hanan Youssef, Hisham Mohamed, Mostafa Shazli, Waleed Khalifa
|On-Site Speaker (Planned)
||Iman El Mahallawi
The most important material in concentrated solar power systems (CSP) is the selective absorber coating, as it determines the efficiency of the CSP. These coatings are characterized by high absorbance in visible and IR range and low emittance in long wavelengths of solar spectrum. High performance candidate thin film (selective coatings) must have high adhesion and homogeneity; they should also resist degradation parameters of oxidation and corrosion at high temperature. Nitrides, oxides and oxynitrides cermet solar coatings have recently gained wide popularity, with TiN, AlN, TiO2 and TiNOx being the highest candidates. In this work thin films of AlN and TiN are deposited on stainless steel substrates, by physical vapor deposition. The solar absorbance of both is compared in this study by using SEM, XRD and Spectrophotometer. The results suggest that new generations of high temperature solar selective absorber coatings may be made from combining both materials.