PI: Luís Rebouta
The objective of this project is to develop a coating of 4 to 5 layers for selective absorption of solar radiation having simultaneously high solar absorptance (α>0.96) and low emissivity (ε < 0.07 at 450°C) together with high thermal stability above 450°C. The first layer of the multilayer structure will be a back reflector tungsten layer with high electrical conductivity. For the remaining stack will comprise a double film structure for phase interference and finally an antireflection layer. For these double film structures, solutions based on high and low volume fraction cermets and nitride/oxynitride structures will be used. A diffusion barrier will be tested, which will be deposited before the metallic back reflector. The functionality of the multilayer structures will be verified through the solar absorptance and emissivity measurements and the coating performance and durability will be evaluated with thermal annealing in air at 450 ºC and in vacuum at 600 ºC.
- UNIVERSIDADE DO MINHO