Author/Authors :
Mashayekhi، M. نويسنده M. Sc., Department of Chemistry, Malek Ashtar University of Technology, P. O. Box 83145/115, ShahinShahr, Isfahan, Iran , , Ghani، K. نويسنده , , Shoja Razavi، R. نويسنده Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran , , Shokrolahi، A. نويسنده Assistant Professor, Department of Chemistry, Malek Ashtar University of Technology, P. O. Box 83145/115, Shahin Shahr, Isfahan, Iran , , Kiomarsipour، N. Kiomarsipour نويسنده M. Sc., Department of Materials Engineering, Malek Ashtar University of Technology, P. O. Box 83145/115, Shahin Shahr, Isfahan, Iran ,
Abstract :
The thermo-optical properties of a coated surface are important for spacecraft thermal control coatings which depend on the optical properties and structure of the coating material. These coatings control the temperature by their capability of outer energy absorption and emission. The optical properties of pigment can be improved by generating a high fraction of voids in its structure. In this paper, mesoporous Co3O4 powders were successfully synthesized through hard template method using SBA-15. The resulting black pigment was characterized using BET, XRD and FE-SEM. The reflective property of Co3O4 was investigated by diffuse reflectance ultraviolet-visible near-infrared spectrophotometer. Reflectance measurement revealed that these mesoporous materials had high absorption characteristic (?s=0.95). The resulting mesoporous Co3O4 was mixed with potassium silicate as transparent binder to coat Al substrate which shows high solar absorptance (?s=0.94) and high thermal emittance (?t=0.96). The study indicated that Co3O4 coating may be a promising kind of black thermal control coatings.
