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Method for preparing graphene reinforcing boron carbide ceramic material

A boron carbide ceramic and graphene technology, applied in the field of ceramic materials, can solve the problems of low density, high brittleness, low flexural strength and fracture toughness, etc., achieve good dispersibility and stability, stable enhancement and toughening effect, and process Feasible effect

Inactive Publication Date: 2018-09-14
ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Although boron carbide has excellent properties such as high hardness, high strength, high elastic modulus, and low density, its flexural strength and fracture toughness are low, and its brittleness is relatively high. In order to improve the brittleness of boron carbide ceramics, it is necessary to enhance the material. toughness modification

Method used

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  • Method for preparing graphene reinforcing boron carbide ceramic material

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Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 A kind of preparation method of graphene reinforced boron carbide ceramic material:

[0015] 1..1 Raw materials: boron carbide powder (d50=2±0.2μm, purity ≥99%); graphene is graphene oxide (GO), the number of layers of graphene is 7-10 layers, and the purity is 99.8%;

[0016] 1.2 Process steps:

[0017] Step 1) preparation of dispersant aqueous solution: a certain amount of N-methylpyrrolidone (NMP) with a purity of 99.9% is added to deionized water, so that the concentration of dispersant aqueous solution is 1% (N-methylpyrrolidone: deionized water = 1:100ml), put the well-proportioned dispersant aqueous solution on an ultrasonic cleaner for ultrasonic dispersion for 15 minutes, so that N-methylpyrrolidone can be evenly dispersed in water, so that the subsequent graphene oxide can be better dispersed in water.

[0018] Step 2) dispersion of graphene: dispersion of graphene: take boron carbide powder and graphene oxide to be added, wherein, the weight of ...

Embodiment 2

[0022] Embodiment 2 product performance test

[0023] The ceramic material obtained by the preparation method of the graphene-enhanced boron carbide ceramic material obtained in Example 1 is subjected to a performance test, and the graphene / B4C composite material density is 2.52 ± 0.01g / cm 3 ;Hardness: HV3350±50;

[0024] Bending strength: 500±20MPa; fracture toughness 5±0.5MPa m 1 / 2 .

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Abstract

The invention adopts addition of graphene to toughen boron carbide ceramic. The mechanism of the graphene reinforcing and toughening is crack deflection, branch, bridge connection, fracture, pulling out and the like. Different from the one-dimensional toughening of fibers, nanotubes, whiskers and the like which are aggregated easily in the past, the graphene is a two-dimensional material, can significantly reduce the mutual attraction among graphene sheets to avoid agglomeration through surface modification and decoration, and has very good dispersity and stability in some liquid mediums. Forexample, the surface of oxidized graphene contains a large amount of oxygen-containing functional groups such as hydroxide radicals, carboxyl and the like, and a stable and disperse graphene solutioncan be prepared; the graphene solution is mixed with ceramic matrix slurry, a graphene ceramic mixed raw material with a good implantation effect can be obtained, therefore, the reinforcing and toughening effects of the graphene ceramic mixed raw material are relatively stable, and the technological feasibility is better.

Description

technical field [0001] The invention belongs to the field of ceramic materials, in particular to a method for preparing a graphene-reinforced boron carbide ceramic material. Background technique [0002] Although boron carbide has excellent properties such as high hardness, high strength, high elastic modulus, and low density, its flexural strength and fracture toughness are low, and its brittleness is relatively high. In order to improve the brittleness of boron carbide ceramics, it is necessary to enhance the material. toughness modification. Contents of the invention [0003] In order to solve the larger problem of the brittleness of boron carbide ceramics, the invention provides a method for preparing a graphene-enhanced boron carbide ceramic material, the preparation method comprising the steps of: [0004] Step 1) preparing an aqueous dispersant solution: adding N-methylpyrrolidone (NMP) with a purity of more than 99.9% into deionized water so that the concentration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B2235/425C04B2235/656C04B2235/77C04B2235/96
Inventor 崔毅徐斌桓方宁象姚易斌
Owner ZHEJIANG LIGHT TOUGH COMPOSITE MATERIALS
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