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Silicon carbide/resin bionic composite material with directional microstructure, and preparation method thereof

A biomimetic composite material and composite material technology are applied in the field of silicon carbide/resin biomimetic composite materials and their preparation, which can solve the problems of coarse structure, weak interface bonding force and high equipment requirements of composite materials, and achieve enhanced fracture toughness and impact resistance. The effect of improved performance, fracture toughness and impact resistance, and excellent overall performance

Active Publication Date: 2018-11-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the material has an oriented lamellar structure, the thickness of the ceramic preform and the metal thin film green body prepared by the tape casting process is relatively large, on the order of millimeters, resulting in a too coarse microstructure and poor mechanical properties of the composite material obtained by hot pressing and sintering. therefore restricted
At the same time, there may be problems such as weak interfacial bonding force and thermal expansion mismatch between metal and ceramic phases, and the preparation process is complicated to operate, the process is long, and the requirements for equipment are high.
[0007] In addition, the above-mentioned patents can only realize a simple lamellar structure in the material, and cannot realize the cross-laminated structure commonly found in shells and the fiber helical structure similar to crab shells

Method used

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  • Silicon carbide/resin bionic composite material with directional microstructure, and preparation method thereof
  • Silicon carbide/resin bionic composite material with directional microstructure, and preparation method thereof
  • Silicon carbide/resin bionic composite material with directional microstructure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, a silicon carbide whisker / polymethyl methacrylate composite material with a microscopic oriented structure was prepared. The raw materials used mainly include silicon carbide whiskers (average diameter 2.5μm, length 50-200μm), silicon oxide powder (average particle size 20nm), deionized water, polyvinyl alcohol, hydroxypropyl methylcellulose powder (average particle size 180 μm), polyacrylic acid and methyl methacrylate, the specific preparation process is as follows:

[0043] (A) Preparation of slurry

[0044] Add 720g of deionized water into a 1000mL plastic jar, add 100g of silicon carbide whiskers, 4g of silicon oxide powder, 35g of polyvinyl alcohol and 2g of polyacrylic acid into the bottle, and stir at a speed of 60rpm until the solid powder is evenly dispersed in the water. Place the jar in a constant temperature water bath at 70°C, keep it warm for 30 minutes, slowly add 14g of hydroxypropyl methylcellulose powder into the bottle, and stir un...

Embodiment 2

[0057] In this example, a silicon carbide / epoxy resin composite material with a microscopically oriented cross lamination structure was prepared. The raw materials used mainly include nano-silicon carbide powder (average particle size 100nm), nano-yttrium oxide powder (average particle size 30nm), nano-alumina powder (average particle size 20nm), deionized water, polyvinyl alcohol, hydroxypropyl Base methyl cellulose powder (average particle diameter 180 μ m), polyacrylic acid, epoxy resin and curing agent, concrete preparation process is as follows:

[0058] (A) Preparation of slurry

[0059] Add 185g of deionized water to a 500mL plastic jar, add 45g of nano-silicon carbide powder, 2.853g of nano-yttrium oxide powder, 2.147g of nano-alumina powder, 8g of polyvinyl alcohol and 1g of polyacrylic acid into the bottle , stirring at a speed of 100rpm until the solid powder is evenly dispersed in water. Place the jar in a constant temperature water bath at 70°C, keep it warm for...

Embodiment 3

[0070] In this example, a silicon carbide / epoxy resin composite material with a microscopically oriented lamellar structure was prepared. Used raw material is identical with embodiment 2, and concrete preparation process is as follows:

[0071] (A) Preparation of slurry and preparation of porous body

[0072] According to the same operation as the steps (A) and (B) of Example 2, a green body with an oriented porous structure composed of silicon carbide powder and additives was prepared.

[0073] (B) Body compression treatment

[0074] Place the freeze-dried green body in a steel mold, and use a hot press to compress the green body in a direction perpendicular to the silicon carbide layer at 100°C. The compression deformation is 50%, and the pressure is kept for 10 minutes. After cooling, unload and The green body is taken out from the mould.

[0075] (C) Organic matter removal and sintering

[0076] The green body was deorganized and sintered according to the same operatio...

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Abstract

The invention relates to a silicon carbide / resin bionic composite material with a directional microstructure, and a preparation method thereof. The composite material is prepared from silicon carbideof which the volume fraction is 10-95%, and resin, and microscopically has the directional microstructure so as to be shown in a way that silicon carbide is directionally arranged in a resin matrix. The preparation method comprises the following steps: firstly, preparing water base slurry which contains silicon carbide powder; then, through freezing casting and vacuum freezing drying, obtaining ablank with a directional porous structure; carrying out compressing on the blank, removing organic matters, and sintering to obtain the directional porous skeleton of silicon carbide; carrying out surface modification and liquid resin monomer impregnation on the skeleton, and obtaining the silicon carbide / resin bionic composite material with the directional microstructure after resin aggregationis carried out. The composite material has excellent performances of light weight, high strength, abrasion resistance and the like, the plasticity, the toughness and the impact resistance of the composite material are obviously improved than that of silicon carbide, and therefore, the silicon carbide / resin bionic composite material is expected to serve as a structural material to be used in fields including armor protection, transportation, electronic products and the like.

Description

technical field [0001] The invention relates to the field of silicon carbide / resin composite materials, in particular to a silicon carbide / resin biomimetic composite material with a microscopic directional structure and a preparation method thereof. Background technique [0002] Silicon carbide, also known as moissanite, commonly known as emery, is a highly covalent covalent bond compound with few lattice defects and high bond strength between Si-C atoms, so it has high melting point, high hardness and high creep resistance. ability to change. Silicon carbide includes α-SiC with high temperature stability and β-SiC with low temperature stability, among which α-SiC is widely used in industry. α-SiC has a hexagonal crystal structure with a density of 3.217g / cm 3 , the silicon carbide ceramic material prepared from it has the advantages of light weight, high hardness, wear resistance, corrosion resistance, good thermal conductivity, good thermal shock resistance, etc., and ca...

Claims

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Application Information

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IPC IPC(8): C08L33/12C08L63/00C08K9/06C08K3/34C08K7/10
CPCC08K3/34C08K7/10C08K9/06C08L33/12C08L63/00
Inventor 刘增乾焦大张明阳刘艳艳张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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