MULTILAYER SELECTIVE COATING FOR SOLAR COLLECTOR AND ITS PRODUCTION PROCESS Russian patent published in 1999 - IPC

FIELD: surfaces of solar collectors converting solar energy to heat. SUBSTANCE: coating is composed of titanium layer, thick, layer of non-stoichiometric oxides, carbides, or titanium nitrides TiCxOy or TiNx, thick, and layer of carbon-containing material, thick, deposited from glow discharge in vapors of organic or hetero-organic materials; refractive index of last layer , where λ_o is wavelength corresponding to solar spectrum maximum; n₁ is refractive index of last but one layer; is refractive index of titanium. Coating is produced by high-vacuum evaporation of titanium layer followed by reactive spraying of titanium in CO₂ or N₂ vapors at pressure of 2,5÷8•10^-2 Pa; for final procedure, amorphous carbon-containing solid material is deposited on surface being coated from glow discharge in vapors of organic or hetero-organic compounds at pressure of 10 to 20 Pa. EFFECT: improved effectiveness of coating deposited by environmentally safe process; improved productivity. 2 cl, 1 dwg