Preparation method of in-situ growth silicon carbide nanowire-reinforced porous carbon composite

Abstract

The invention provides a preparation method of an in-situ growth silicon carbide nanowire-reinforced porous carbon composite, and belongs to the field of aerospacecraft thermal protection systems. The method includes the steps that short carbon fibers and phenolic resin particles are added into a hydroxyethyl cellulose dispersant, stirring is carried out, a uniform solution is obtained, the solution is added into a vessel with a gypsum block, water absorption is carried out, a mass with the short carbon fibers mingled with the phenolic resin particles is formed, drying, solidification and carbonization are carried out, and a porous carbon composite blank is formed; silicon powder is put into a vessel, the porous carbon composite blank is added into the silicon powder, the mixture is heated to 1500 DEG C under the vacuum or inert gas condition, heat preservation is carried out for 30 min, and a blank with silicon carbide nanowires is generated; the blank is put into a phenolic resin solution, vacuum impregnation is carried out, airing, solidification and carbonization are carried out, and the silicon carbide nanowire-reinforced porous carbon composite is obtained. The method solves the problem that silicon carbide nanowires are difficult to disperse in preparation of a silicon carbide nanowire-reinforced porous carbon composite, and wide application prospects of the method are guaranteed.

Description

technical field [0001] The invention belongs to the field of thermal protection systems (TPS) of aerospace vehicles, relates to a preparation method for in-situ growth of silicon carbide nanowire reinforcement phase in a porous carbon composite material, and overcomes the problem of low strength of the porous carbon composite material. Background technique [0002] Porous carbon composites are composite materials with high porosity formed by chopped fibers connected to a carbon matrix. Since the establishment of the Oak Ridge National Laboratory in the United States in 1960, porous carbon composites have been well developed. Due to its light weight (density 0.3g / cm 3 -1g / cm 3 ) High porosity (60%-90%), low thermal conductivity (0.204Wm thermal conductivity in the Z direction -1 K -1 to 0.894Wm -1 K -1 , the thermal conductivity in XY is 0.314Wm -1 K -1 to 1.888Wm -1 K -1 ), high-temperature structural stability, easy molding, and is expected to be applied to key com...

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Problems solved by technology

[0004] Silicon carbide nanowires are easy to agglomerate and not easy to disperse. If ball milling is used, the structure of silicon carbide nanowires will be easily destroyed.

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