Self-sealing layered CNT paper/SiC gradient nanocomposite material and preparation method thereof

Abstract

The invention discloses a self-sealing layered carbon nanotube paper / SiC gradient nanocomposite material and a preparation method thereof. The self-blocking layered carbon nanotube paper / SiC gradientnanocomposite material includes a multilayer composite material sealed in the layer direction, and the multilayer composite material at least includes structural layers and interface layers which arestacked mutually; and the structural layers are B4C modified CNT paper / SiC composite material layers, the interface layers are expanded graphite and SiC whisker dispersion toughened resin carbon layers, wherein the SiC contents in the structural layers are changed in gradient in the thickness direction, the thicknesses of the structural layers are 200-500 [mu]m, and the thicknesses of the interface layers are 20-50 [mu]m. According to the self-sealing layered carbon nanotube paper / SiC gradient nanocomposite material and the preparation method thereof, resin carbon with expanded graphite and SiC whiskers evenly dispersed inside is used for welding the multiple CNT paper / SiC composite material structure layers, the Si content in a carbon nanotube paper porous preform is gradually changed, the SiC content of the CNT paper / SiC nanocomposite material generated by a resin carbon-molten Si in-situ reaction is increased progressively in the thickness direction, and the tree-ring-shape-like self-sealing layered composite material with gradient change in composition and structure is formed.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, in particular to a self-blocking layered CNT paper / SiC gradient nanocomposite material and a preparation method. Background technique [0002] Carbon nanotubes (CNTs) are lightweight materials with excellent mechanical, electrical and thermal properties. One of the most promising applications of CNTs is the development of nanocomposites. CNTs have a large number of potential applications due to their very large aspect ratio (1000-10,000), low density, and high stiffness (Young's modulus is about 1 TPa). Moreover, CNTs also have excellent thermal conductivity (at room temperature along the axial direction, a single single-wall carbon nanotube (Single Wall Carbonnanotube, SWCNT), 6600W / mK; a single multi-wall carbon nanotube (Multi-wall carbon nanotube, MWCNT), >3000W / mK) and excellent electrical conductivity (at room temperature along the axial direction, the conductivity of MWCNT is 70...

AI Technical Summary

Problems solved by technology

[0003] The preparation of ceramic matrix composites is limited due to the strong agglomeration of CNTs in the matrix, and, due to the obvious anisotropy of their properties, CNTs have high strength and stiffness parallel to their axial direction, and are extremely excellent Conductors of electricity and heat are much softer perpendicular to their axis, and the electrical and thermal conductivity is significantly reduced, so the random arrangement of CNTs in the ceramic matrix will also limit its excellent performance

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