A Novel Thermal Insulation Coating with SiO2@TiO2 Core-shell Particles and Its In-situ Characterization at High Temperature

A novel type of SiO2@TiO2 core-shell particles were fabricated as pigments for high-temperature thermal insulation coatings using a Sol-Gel method. TEM images of SiO2@TiO2 core-shell particles indicated that TiO2 shell with a thickness about 50 nm was deposited well on the surface of SiO2 particles. The thermal insulation properties of the products obtained were characterized by a developed apparatus in the temperature range from 1300℃ to 1500℃. The results show that, using SiO2@TiO2 particles as a radiant barrier, the heat flux from radiation sources is success- fully reduced by about 50% and the temperature difference reaches 260℃ when radiation heater temperature is 1500℃. The effectiveness of SiO2@TiO2 core-shell particles on high-temperature thermal insulation is obvious. The work suggests that SiO2@TiO2 core-shell particles are very promising pigments for high-temperature thermal insulation coatings.