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

doi:10.3724/SP.J.1077.2012.11691

Abstract

Abstract:

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 successfully 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.

Key words: Sol-Gel method, core-shell, thermal insulation, coating

CLC Number:

TQ174

XIAO Shi-Yu, ZHANG Yue. A Novel Thermal Insulation Coating with SiO₂@TiO₂ Core-shell Particles and Its In-situ Characterization at High Temperature[J]. Journal of Inorganic Materials, 2012, 27(4): 445-448.

Figures/Tables 4

Fig. 1 TEM images of SiO2/TiO2

Fig. 2 FI-IR spectra of films with SiO2/TiO2 and SiO2

Fig. 3 (a) Heat flux passing through films with SiO2@TiO2 and SiO2; (b) Heat flux reduction percentage of SiO2@TiO2 and SiO2

Fig. 4 Temperature difference between upper and lower surfaces of SiO2@TiO2 film and uncoated SiO2 film with the temperature of radiation heater

References 15

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

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