Powder metallurgy preparation method of graphene reinforced aluminum-based composite material

A composite material and reinforced aluminum-based technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of inability to satisfy the dispersion of graphene, complicated preparation process, and poor strengthening effect at the same time, and achieve excellent reinforcement effect, combined with Good and conducive to the effect of large-scale production

Inactive Publication Date: 2021-04-30
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zheng et al. ("Graphene nano-platelets reinforced aluminum composites with anisotropic compressive properties" Materials Science & Engineering A 798 (2020) 140234) mixed aluminum powder and graphene by ball milling method to obtain composite powder, which was hot-pressed into embryos and prepared by multi-pass rolling. material, but due to continuous high temperature processing, graphene reacts with the matrix to form a brittle phase Al 4 C 3 , the graphene nanostructure was severely damaged, the strengthening effect was poor and the preparation process was complicated; Jiang et al. (“Tailoring the structure and mechanical properties of graphene nanosheet / aluminum composites by flake powder metallurgy via shift-speed ball milling” Composites Part A 111 (2018) 73-82) After ball milling the aluminum and graphene composite powder at 200rpm for 6h, the aluminum and graphene composite powder was directly ball milled at 500rpm for 0.5h. Broken and welded, the spherical granular composite powder of graphene / aluminum is finally formed, but the nanostructure of graphene is severely damaged, forming a brittle phase Al 4 C 3 , the strengthening effect is not good
Therefore, the disadvantages of the prior art mainly lie in that the above-mentioned process cannot meet the technical requirements of graphene dispersion, structural integrity, bonding with the matrix, and less metallurgical defects at the same time, so that the performance enhancement of graphene cannot be fully utilized in metal matrix composites. potential

Method used

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  • Powder metallurgy preparation method of graphene reinforced aluminum-based composite material
  • Powder metallurgy preparation method of graphene reinforced aluminum-based composite material
  • Powder metallurgy preparation method of graphene reinforced aluminum-based composite material

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Experimental program
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Effect test

Embodiment 1

[0041] This implementation provides a kind of preparation method of graphene reinforced aluminum matrix composite material (containing graphene 0.3wt.%), such as figure 1 As shown, the steps are as follows:

[0042] Get 49.85g, 10 μ m pure aluminum powder (spherical powder) and 0.15g graphene and place in the stirring ball mill, take ethanol as solvent, add 2g phthalate coupling agent as ball milling process control agent, take stainless steel ball as ball milling medium, The ball-to-material ratio was 20:1, and the graphene / aluminum composite powder was obtained by ball milling at a speed of 100 rpm for 10 hours. After suction filtration and drying, vacuum annealing was carried out at 200°C for 2 hours. figure 2 (a) is the original spherical aluminum powder, figure 2 (b) is the dispersion diagram of graphene on the surface of aluminum sheet after 10h stirring ball milling.

[0043] The annealed graphene / aluminum composite powder is placed in a planetary ball mill, and 2g ...

Embodiment 2

[0049] This implementation provides a kind of preparation method of graphene-enhanced aluminum matrix composite material (containing graphene 0.6wt.%), and the steps are as follows:

[0050] Take 49.7g, 10μm pure aluminum powder and 0.3g graphene and place them in a stirring ball mill, use ethanol as solvent, add 2g phthalate coupling agent as ball milling process control agent, use stainless steel balls as ball milling medium, the ball to material ratio is 20:1, ball milled at a speed of 100 rpm for 10 h to obtain graphene / aluminum composite powder, and after suction filtration and drying, vacuum annealed at 200°C for 2 h.

[0051] The annealed graphene / aluminum composite powder is placed in a planetary ball mill, and 2g of stearic acid is added as a ball milling process control agent. Under the protection of argon, stainless steel balls are used as a ball milling medium, and the ball-to-material ratio is 20:1. The composite particles were obtained by ball milling at a speed ...

Embodiment 3

[0054] This implementation provides a kind of preparation method of graphene-enhanced aluminum-magnesium-silicon-based composite material (containing graphene 0.4wt.%), the steps are as follows:

[0055] Take 49.8g, 35μm 6061 aluminum alloy powder and 0.2g graphene, put it in a planetary ball mill, add 2g stearic acid as a ball milling process control agent, under the protection of argon, use stainless steel balls as the ball milling medium, the ball to material ratio 20:1, ball milled at 120 rpm for 6 hours to obtain graphene / aluminum alloy composite powder, and vacuum annealed at 200°C for 2 hours.

[0056] Put the annealed graphene / aluminum alloy composite powder in a planetary ball mill, add 2g of stearic acid as a ball milling process control agent, under the protection of argon, use stainless steel balls as the ball milling medium, and the ball-to-material ratio is 20:1 , and ball milled at a speed of 250 rpm for 15 min to obtain composite particles.

[0057] After cold...

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Abstract

The invention provides a powder metallurgy preparation method of a graphene reinforced aluminum-based composite material, which comprises the following steps: preparing graphene-aluminum composite powder by long-time low-energy ball milling in advance, annealing, and carrying out short-time high-energy ball milling, densification processing and heat treatment to finally obtain the composite material. Uniform compounding of matrix powder and graphene is achieved through long-time low-energy ball milling, meanwhile, interface reaction can be avoided, and the structural integrity of graphene is protected; the annealed composite powder can improve the plastic deformation capacity of the composite powder while improving the quality of the graphene; short-time high-energy ball milling is performed, so that composite powder is welded into particles, and the quality of graphene is not damaged; and in addition, for the composite material of a aluminum alloy matrix, the uniformly dispersed graphene promotes the precipitation of fine dispersed precipitated phases in the matrix, and the mechanical properties of the composite material are further improved. The method is beneficial to protecting the integrity of the graphene structure to the maximum extent, exerts the graphene strengthening potential, saves energy and time, and is suitable for batch preparation and production.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a powder metallurgy preparation method of graphene-reinforced aluminum matrix composite materials. Background technique [0002] Aluminum and its alloys have received widespread attention due to their low density, high specific strength, and specific modulus, including pure aluminum, medium-strength aluminum-magnesium-silicon series, high-strength aluminum-copper series and ultra-high-strength aluminum-zinc-magnesium-copper series. The aluminum alloys in China are widely used in many fields such as aviation, aerospace, transportation, electronics, construction and sporting goods. The global annual production and usage of aluminum and its alloys are second only to steel materials. With the rapid development of high-tech fields such as aerospace, national defense and military industry, it is difficult for a single material to meet the use requirements of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/05C22C1/10B22F9/04B22F1/00B22F3/00B22F3/24C22F1/04
CPCC22C21/00C22C1/05C22C1/1084C22C1/1094B22F9/04B22F3/00B22F3/24C22F1/04B22F2009/043B22F2003/248B22F2301/052B22F2302/40B22F1/142
Inventor 郭强韩一帆杨淦婷郑王树
Owner SHANGHAI JIAO TONG UNIV
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