PROCESS FOR PRODUCING AN ELEMENT FOR ABSORBING SOLAR RADIATION FOR A THERMAL CONCENTRATING SOLAR POWER PLANT

摘要

An element for absorbing solar radiation, for a thermal concentrating solar power plant, is produced by forming a selective coating (5) on an external surface of a substrate (2) made of a stainless steel chosen from stainless steels having an aluminium content higher than 0.5 wt%. The selective coating (5) is formed in a surface treatment step, by polishing the substrate and then a step of heat treating the substrate in an oxidizing atmosphere in a range of temperatures lying between 550oC and 650oC. The heat treatment in particular allows at least one thin intrinsically selective superficial layer (1) to be formed on the external surface of the substrate.