Self-sealing layered CNT paper/SiC gradient nanocomposite material and preparation method thereof
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A technology of nano-composite materials and multi-layer composite materials, which is applied in the field of nano-composite materials, can solve problems such as the reduction of electrical and thermal conductivity, and achieve the effect of improving flexibility and toughness
Active Publication Date: 2019-05-28
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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[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 extrem
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[0065] The preparation method of the CNT paper reinforced SiC-based gradient nanocomposite material of the present invention specifically includes the following steps:
[0066] 1. Prepare different layers of CNT Buckypaper preforms
[0067] CNTs, B 4 The mass ratio of C micropowder and Si powder is (1~2): (0.5~1.5): (0~1.6), for different layers of Buckypaper preforms, fix CNTs and B 4 The content of C gradually increases the content of Si powder. The preparation method of the single-layer CNT Buckypaper preform is the same as the patent ZL201410475361.1.
[0068] 2. Impregnated with phenolic resin
[0069] The expanded graphite and Si powder are mixed in a ratio of (3-5): (1-2), and a very small amount of nano-iron powder is introduced, and dispersed by ultrasound with anhydrous ethanol as the dispersion medium to obtain a uniformly dispersed suspension. After drying, the expanded graphite mixed powder is obtained.
[0070] Press (1.2~1.6):(0.12~0.20):0.5:0.5:(0.12) of novolak resin, ...
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[0094] Example 1:
[0095] 1) Combine 1g CNTs and 0.8g B 4 C micropowder is dispersed into 1000ml distilled water, and 0.9ml surfactant Triton is added dropwise TM X-100, pulsed ultrasonic dispersion for 60 minutes, to obtain a dispersed, uniform and stable suspension; among them, the diameter of CNTs is about 10-20nm, the length is more than 30μm, and the density is 2.10g / cm 3 ; B 4 The particle size of C micropowder is 0.05~5 μm, and the density is 2.52g / cm 3 ; Si powder has a particle size of 0.1~1.5μm and a density of 2.34g / cm 3 . In addition, the period of pulsed ultrasound is 1min, and every 30s of ultrasound is separated by 30s, the frequency of ultrasonic vibration is 20kHz, and the power is 1300W.
[0096] 2) Prepared by the pressure filtration method in patent ZL201410475361.1 Contains B 4 CNT Buckypaper preform of C powder and Si powder.
[0097] 3) Use steps 1) and 2) to prepare CNTs 1g, B 4 Two CNT Buckypaper preforms of 8 formulations with C 0.8g and elemental Si of 0...
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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...
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