Effect of TiO2 on the thermal performance and emissivity of glass coatings

Abstract

Deep space exploration missions pose significant challenges to the temperature stability and thermal management of electronic components in spacecraft. Thermal radiation coatings have emerged as pivotal technologies, addressing extreme temperature fluctuations in deep space and enhancing instrument performance reliability. In this work, a high-efficiency thermal radiation coating was successfully manufactured through screen printing technology. The effects of glass coatings on thermal radiation, heat dissipation and emissivity were investigated. When functioning on a platinum plate, the 40% TiO₂ coating could reduce the temperature by as much as 23.6 °C. Meanwhile, an approximately 1% increase in the emissivity of the coatings corresponded to the increase in TiO₂ content. The enhancement in coating emissivity was ascribed to alterations in the crystal size, structure, and surface roughness. The 40% TiO₂ coating exhibited superior thermal shock performance at 700 °C. Thus, these glass coatings, with significant infrared radiation characteristics, were expected to emerge as promising options for heat dissipation applications.