Mechanical Property and Thermal Insulation Performance of SiO2/ZrO2 Nanofiber Membranes with High Thermal Stability
The high strength,high temperature resistance and high thermal shock resistance of ceram-ic nanofibers are essential to high temperature thermal insulation materials,which have good application prospects in aerospace and other fields.The low thermal conductivity and good infrared refractive index of ZrO2 nanofibers have attracted much attention in the field of thermal insulation.However,the poor thermal stability(≤1200℃)of ZrO2 nanofiber limits their utilization in the field of high-temperature thermal insulation.In this study,a novel membrane of SiO2/ZrO2-0.5 nanofibers(d=495.8±45.5 nm)with high temperature re-sistance up to 1300℃ was prepared by combining electrospinning technology and preceramic polymer py-rolysis method,the SiO2/ZrO2-0.5 nanofiber composed of amorphous SiO2 phase and t-ZrO2 nanocrystal-line.The fabricated SiO2/ZrO2-0.5 nanofiber membrane shows high tensile strength(4.88±0.27 MPa),good flexibility and excellent thermal insulation performance at high temperatures.Finally,it is worth noting in particular that the thermal conductivity of SiO2/ZrO2-0.5 nanofiber membrane is only 0.167 Wm-1·K-1 at 1000℃,which is significantly lower than those of the known traditional ceramic fiber membranes.
inorganic non-metallic materialselectrospinningSiO2/ZrO2 nanofiber membraneshigh temperature resistancethermal insulation performance
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