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in situ self-generated cu 2 o Preparation of particle-induced quasi-continuous network CNTs/CU-based composites

An in-situ self-generated, composite material technology, applied in the field of CNTs/Cu-based composite materials, can solve problems such as embedding, hindering metallurgical bonding, composite material strength and plasticity decline, and achieve high experimental efficiency, increased strength, and high repeatability Effect

Active Publication Date: 2020-12-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since there is no in-situ reaction between C-Cu, TiB cannot be formed like B and Ti. w Embedded in the adjacent Ti matrix, the CNTs attached to the surface of the Cu particles hinder the metallurgical bonding between the matrix, resulting in a decrease in the strength and plasticity of the composite.

Method used

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  • in situ self-generated cu <sub>2</sub> o Preparation of particle-induced quasi-continuous network CNTs/CU-based composites
  • in situ self-generated cu <sub>2</sub> o Preparation of particle-induced quasi-continuous network CNTs/CU-based composites
  • in situ self-generated cu <sub>2</sub> o Preparation of particle-induced quasi-continuous network CNTs/CU-based composites

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Experimental program
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Effect test

Embodiment 1

[0038] Based on in situ self-generated Cu 2 The specific steps for the preparation of quasi-continuous network CNTs / Cu composites induced by O particles are as follows:

[0039] (1) Acidification of CNTs

[0040] Prepare a mixed acid solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:2; add 1 g of multi-walled CNTs to 240 mL of the mixed acid solution, and let stand at 50 ° C for 10 h, wash and dry to obtain acidified CNTs, as figure 1 shown;

[0041] (2) CNTs are electrostatically adsorbed on the surface of Cu powder

[0042] Evenly disperse 0.1g of acidified CNTs into 100mL of deionized water to obtain a CNTs solution; uniformly disperse 25g of spherical copper powder with a particle size of 50 μm into 400mL of deionized water, and adjust the pH value of the solution with 3% dilute hydrochloric acid to 3 to obtain a copper powder solution; at a stirring rate of 300r / min, add the CNTs solution to the copper powder solution, and the...

Embodiment 2

[0051] Based on in situ self-generated Cu 2 The specific steps for the preparation of quasi-continuous network CNTs / Cu-Ti composites induced by O particles are as follows:

[0052] (1) Acidification of CNTs

[0053] Prepare a mixed acid solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:5; add 0.25g of multi-walled CNTs to 240mL of the mixed acid solution, and stand at 70°C for 4h, wash and dry to obtain acidified CNTs;

[0054] (2) CNTs are electrostatically adsorbed on the surface of Cu-Ti alloy powder

[0055] Evenly disperse 0.2g of acidified CNTs into 100mL of deionized water to obtain a CNTs solution; uniformly disperse 50g of spherical Cu-Ti alloy powder with a particle size of 20μm into 600mL of deionized water, and dilute hydrochloric acid with a mass fraction of 5%. The pH value of the solution was adjusted to 4 to obtain a Cu-Ti powder solution; at a stirring rate of 300r / min, the CNTs solution was added to the Cu-Ti powde...

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Abstract

The invention relates to an in-situ self-generated Cu 2 The invention discloses a method for preparing a CNTs / Cu-based composite material with a quasi-continuous network structure induced by O particles, and belongs to the technical field of nanocomposite materials. The method of the present invention is that acidified CNTs are adsorbed on the surface of copper-based powder by electrostatic force, and then ‑ In situ Cu formation on the surface of copper-based powders under the action of corrosion 2 O particles, and achieve Cu 2 The tight nesting of O particles and CNTs, and then through the H 2 The quasi-continuous network CNTs / Cu matrix composite was obtained by reduction and sintering, and the strengthening effect of the CNTs "enriched area" and the toughening effect of the CNTs "depleted area" made the quasi-continuous network structure of the CNTs / Cu-based composite material in the While improving the strength, it can maintain good plasticity. The method of the invention has the advantages of simple operation, short experimental process, high repeatability, high experimental efficiency, and is expected to realize small-scale engineering application.

Description

technical field [0001] The invention relates to a method utilizing in-situ self-generated Cu 2 The invention discloses a method for preparing CNTs / Cu-based composite materials with a quasi-continuous network structure induced by O particles, and belongs to the technical field of nanocomposite materials. Background technique [0002] Discontinuously reinforced metal matrix composites (DRMMCs) are prepared by powder metallurgy technology, and the reinforcement is uniformly dispersed in the matrix to improve the tensile strength of the material, but the common defect of this type of composite material is that the plasticity is significantly reduced. The reason is that the reinforcements are highly uniformly dispersed and the matrix lacks an effective plastic deformation bearing area, resulting in the reinforcements hindering the sliding behavior of the matrix during the plastic deformation process. In recent years, the influence of non-uniform distribution of reinforcements on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C9/00B22F3/105
CPCC22C1/05C22C9/00C22C26/00B22F3/105C22C2026/002B22F2003/1051B22F2998/10B22F1/16B22F1/14B22F1/145
Inventor 张洪梅刘亮李云凯程兴旺范群波张朝晖穆啸楠
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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