ZrO2 aerogel modified by SiO2 was synthesized by aging ZrO2 gel prepared using ZrOCl2·8H2O as
precursor, and 1,2-propylene oxide(PO) as a gelation agent in tetraethoxysilane (TEOS) solution followed by high
temperature supercritical fluid drying method ( HTSCFD). The influence of SiO2 to the structure of ZrO2 aerogel at
high temperature was investigated by comparing structural transformation before and after SiO2 modifying. The prepared
samples were characterized using FT-IR spectra, X-ray diffraction ( XRD), scanning electron microscopy
(SEM) and transmission electron microscopy (TEM). The results showed that high temperature stability of ZrO2 aerogel
is highly improved after forming a SiO2 layer covered on the surface of the ZrO2 gel particles during aging process
in TEOS solution.