Study of the photo-stability of ceramic thermal control coating based on aluminium oxide

• Published in: Ceramics international Vol. 50; no. 21; pp. 41039 - 41043
• Main Authors: Mikhailov, M.M., Lapin, A.N., Yuryev, S.A., Goronchko, V.A., Artishchev, S.A., Trufanova, N.S., Fedosov, D.S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2024
• Subjects: Aluminium oxide; Irradiation; PCB printing; Photostability; Solar spectrum photons; Thermal control coatings; PCB printing; Aluminium oxide; Irradiation; Thermal control coatings; Solar spectrum photons; Photostability
• ISSN: 0272-8842
• DOI: 10.1016/j.ceramint.2024.07.415

The study examined the photo-stability of the thermal control coating (TCC), a class of “Optical Solar Reflectors”, used in spacecrafts. This TCC is achieved by applying a layer of dielectric ceramic paste (DCP) onto the substrate using a printer (PCB printing). The DCP was prepared from filler (ground Al2O3 ceramic) and solvent with thickener (terpineol with ethylcellulose). The coating obtained by high-temperature firing (T = 850 оC, 2 h) has high reflectivity in the solar range of the spectrum (0.2–2.5 μm) with the solar absorptance (αs) of DCP equal to 0.143. It has high adhesion and photo-stability that exceeds photo-stability parameters of ZnO, TiO2, BaSO4, and CaSiO3 pigments. The developed coating can be recommended not only as a TCC for spacecrafts, but also as a protective or dielectric layer in manufacturing of printed circuit boards in various fields of technology, where increased resistance to solar radiation or its ultraviolet region is required.