Abstract
We herein report a porous nano-SiC foam fabricated by foam-gelcasting-freeze drying method with ultra-high porosity (96%). Porous nano-SiC sintered at 1300 °C and1400 °C exhibit excellent balanced high compressive strength (1.44 MPa) and low thermal conductivity (0.064 W/(m·K)). The porous nano-SiC can be invoked as a candidate for high temperature thermal insulation. The low thermal conductivity mainly originates in the high porosity and the strong scattering of phonons by the nanostructure of the skeleton.
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