Silicon carbide fiber solid fabric for in-situ growing carbon nano tubes, composite material and preparation method thereof

Abstract

The invention discloses a silicon carbide fiber solid fabric for in-situ growing carbon nano tubes, which is formed by mainly weaving silicon carbide fibers. In the invention, in-situ grown carbon nano tubes are uniformly distributed on the surfaces of the silicon carbide fibers and mutually wound to form a reticular structure. The preparation method comprises the following steps of: pretreating the silicon carbide fiber solid fabric; loading a Ni-La-Al composite catalyst by adopting a catalyst precursor vacuum impregnation-reduction method; and finally, carrying out chemical gas-phase deposition to ensure that the carbon nano tubes are in-situ grown on the silicon carbide fiber solid fabric. The invention also discloses a carbon nano tube-silicon carbide fiber mixed enhanced composite material which is prepared by using silicon carbide as a substrate and the silicon carbide fiber solid fabric as a reinforcement body by adopting a traditional precursor impregnation-conversion method. The silicon carbide fiber solid fabric has the advantages of uniform carbon nano tube dispersion, higher and controllable carbon nano tube content, good combination with fibers, and the like.

Description

technical field [0001] The invention relates to an inorganic non-metallic material and a preparation method thereof, in particular to a special silicon carbide fiber three-dimensional fabric and a preparation method thereof. Background technique [0002] Carbon nanotubes (CNTs) have a large aspect ratio and a large specific surface area, their tensile strength is 100 times that of steel, nearly 2 times that of carbon fibers, and their density is only 1 / 6~1 of steel. / 7, the room temperature thermal conductivity of multi-walled carbon nanotubes was measured to be 3000 W m -1 ·K -1 . The mechanical properties of carbon nanotubes are significantly better than other whisker materials. At the same time, its excellent electrical and thermal conductivity can significantly improve the functionality of composite materials. The introduction of appropriate content of carbon nanotubes into traditional fiber reinforced ceramic matrix composites (FRCMC) , is expected to achieve the pur...

AI Technical Summary

Problems solved by technology

As a reinforcement of composite materials, there is no connection between layers of laminated and molded two-dimensional fiber fabrics, which directly leads to low interlayer shear strength of composite materials and easy delamination.

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