CENTRAL TUBE FOR A LINEAR CONCENTRATING SOLAR THERMAL POWER PLANT, HAVING AN ABSORBER LAYER, AND METHOD FOR APPLYING SAID ABSORBER LAYER

摘要

A central tube for linear concentrating solar thermal power plants, has an absorber layer. The absorber layer is generated by cold gas sputtering, wherein suitable method parameters can in particular generate an increased surface roughness by means of pores in the surface region of the absorber layer. An absorber layer can thus be advantageously produced, having a quadratic roughness of no more than 1 m, measured in a close range of no more than 50 m diameter, and preferably being made of a corrosion-proof hard alloy comprising tungsten carbide, in particular WCCoCr, WCCo, WCFeCo, WCFeC, WCFeNi, WCNi or WCNiCr.