Emissivity at high temperature of Ni-based superalloys for the design of solar receivers for future tower power plants

In the framework of H2020 European project POLYPHEM, whose main objective is to improve flexibility and performance small-scale solar power plants, studies have been conducted on various nickel-based alloys for design receiver. Inconel 600 alloy used as a reference material in advanced manufacturing high temperature receivers but other oxidation resistant selected such 617, Haynes 230, HR120 Hastelloy X best candidate will be making prototype. Thus, two essential quantities, namely absorptivity α – higher better total hemispherical emissivity ε lower were measured vacuum under atmospheric air up 1400 K MEDIASE reactor installed at focus 1000 kW furnace. The reach α/ε ratio highest possible. measurement was made by direct method requiring true using bi-chromatic pyro-reflectometer that its radiance spectro-radiometry. Total data are presented same time microstructural (SEM, XRD) topographic (3D profilometry) characterizations allowing interpretation evolution with growth oxide layer. Finally, 230 chosen build