High-temperature tolerance in WTi-Al2O3 cermet-based solar selective absorbing coatings with low thermal emissivity

A novel solar selective absorbing coating demonstrates a very low thermal emissivity of ~10.3% @500 °C even after annealing at 600 °C for 840 h with a high solar absorptance of ~93%. In particularly, the thermal stability of the coating is enhanced by innovatively using the segregation of solute and oxide passivation, which is greatly different from the traditional method.413