SiO2@TiO2核壳结构及其在高温下的隔热性能表征

摘要

以SiO2@TiO2核壳结构粒子为新型功能填料,采用旋涂方法制得了高温隔热涂层.TEM照片显示通过溶胶- 凝胶法,成功在SiO2核上包覆上厚度为50 nm的TiO2壳层.通过自开发的测试设备表征了填料加入前后涂层在1300～1500℃的隔热性能.结果表明:SiO2@TiO2核壳结构粒子加入后,隔热涂层能将从热源辐射出的热流减少50％,在热源温度达1500℃时涂层试样的表背温度差为260℃.加入SiO2@TiO2核壳粒子的涂层在高温下隔热效果明显,是一种很有前景的高温隔热涂层填料.%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.