Preparation and Thermal Stability of AlMoON Based Solar Selective Absorption Coating

Abstract

AlMoON based solar selective absorption coatings were deposited on stainless steel substrate by magnetron sputtering. The coatings included infrared reflection layer Mo, absorption layer AlMoN, absorption layer AlMoON and antireflection layer AlMoO from bottom to top. The surface of the deposited coatings is flat without obvious defects. The absorptivity and emissivity are 0.896 and 0.09, respectively, and the quality factor is 9.96. After heat treatment at 500 °C-36 h, the surface roughness of the coating increases, a small number of cracks and other defects appear, and the broken part is still attached to the coating surface. A certain degree of element diffusion occurs in the coatings, resulting in the decline of the optical properties of the coatings. The absorptivity and emissivity are 0.883 and 0.131, respectively, the quality factor is 7.06, and the PC value is 0.0335. The coatings do not fail under this condition and have certain thermal stability.

Keywords

AlMoON / coating / preparation / thermal stability

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