A HIGH THERMAL STABLE SELECTIVE SOLAR ABSORBER LAYER WITH LOW EMISSIVE BARRIER COATING OVER A SUBSTRATE AND A PROCESS OF PRODUCING THE SAME

摘要

The invention relates to high thermal stable solar selective absorber layer with low emissive property comprising a solar absorber layer (2a), having a micro porous surface structure consisting of composite metal oxides of Mn, Cu and Fe metal oxides generated over the stainless steel substrate (1a) like plates and tubes and additionally with barrier composite layers of Zr02-Si02.(3a). It also disclose process of producing the comprising; cleaning and drying the substrate (1a) either in an air drier for 2-5 min or in an air- oven at 100° C for 5-10 min; and further heating in a muffle furnace for thermal oxidation in the range of 500-7000C for 0.5-1 h using different rates of heating in the range of 30 0 -210 0 C/h. Additionally a coatings(3a) is given by depositing barrier coatings developed from Zirconium n-propoxide and 3Glycidoxypropyltrimethoxysilane (GPTS) to make it weather resistance with low thermal emissive property. The inventive product can be employed effectively both in the evacuated and non evacuated environments for solar thermal applications. 3a SA 2a la Fig. 1