Carbon nano tubes (CNTs) and graphene nano flakes (GNFs) synergetic enhanced aluminum-based composite and preparation method

An aluminum-based composite material and nano-carbon material technology, applied in the field of aluminum-based composite materials, can solve problems such as poor graphene binding effect, and achieve the effects of excellent and reliable material performance, fast reaction rate and low cost

Active Publication Date: 2017-02-15
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the deficiency in the prior art about the lack of composite materials prepared by the application of graphene materials, and the problem that the combination effect of graphene applications is not good, and to provide a GNFs / CNTs synergistically enhanced Al / Si / Al 2 o 3 Preparation method of composite material

Method used

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  • Carbon nano tubes (CNTs) and graphene nano flakes (GNFs) synergetic enhanced aluminum-based composite and preparation method
  • Carbon nano tubes (CNTs) and graphene nano flakes (GNFs) synergetic enhanced aluminum-based composite and preparation method
  • Carbon nano tubes (CNTs) and graphene nano flakes (GNFs) synergetic enhanced aluminum-based composite and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] The test samples in the experiment in this embodiment are aluminum matrix composite materials reinforced by CNTs and GNFs alone and mixed with CNTs and GNFs. It is necessary to determine the content of nano-carbon materials in these three samples in advance. Therefore, we used the method of hot pressing and sintering to prepare aluminum matrix composites with various contents of CNTs, GNFs single reinforcement and CNTs and GNFs mixed reinforcement, tested their hardness, and determined the three composites in the next experiment by comparing the hardness. The content of material nano-carbon material (as shown in Table 1).

[0089] Table 1 Hardness table of composite materials prepared by hot pressing and sintering

[0090]

[0091] It can be drawn from Table 1 that the contents of the corresponding nano-carbon materials with the highest hardness of the three composite materials are 1.0% GNT, 0.5% GNFs, 0.25% GNFs+0.75% CNTs, and the amount of silicon in the aluminum-...

Embodiment 2

[0095] Determine Reagent Concentration

[0096] This experiment is mainly used to prepare surface-modified CNTs and GNFs. If the concentration of the aqueous solution used for surface modification is too high, the modification effect of CNTs and GNFs will be weakened, and the active functional groups grafted to the surface will desorb, and if the concentration of the aqueous solution is too low, the modification effect will not be achieved.

[0097] The modified carbon nanotubes were prepared by successively using gallic acid aqueous solutions with concentrations of 5 μg / ml, 10 μg / ml and 20 μg / ml. Fourier transform infrared spectroscopy was used for characterization and analysis, and CNTs (pure CNTs) without gallic acid aqueous solution were used for comparison. It was found that the peak shape of the Fourier transform infrared spectrum of graphene without gallic acid aqueous solution treatment was wider and the peak was weaker. However, the CNTs treated with gallic acid a...

Embodiment 3

[0105] Preparation of composite powder

[0106] First, number the ball milling tanks with the same type and quantity of agate balls in the three tanks respectively, according to the ingredient data in Table 2, add the corresponding raw materials into each tank in the order of density from small to large, and then add an appropriate amount of agate balls. Butanol is added as a process control agent to prevent powder cold welding and sticking to the wall, and finally the ball mill jar is put into the WL-1 planetary ball mill for ball milling and mixing for 1.5h. By ball milling, the powder can be further refined and uniform and can improve the dispersion of CNTs and GNFs in the matrix.

[0107] After ball milling, pour the mixed powder and agate balls into a metal sieve, place a stainless steel plate directly below the metal sieve to receive the powder, shake the sieve repeatedly with both hands, and finally the composite powder is sieved into the stainless steel plate, and pa...

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Abstract

The invention discloses a GNFs / CNTs synergetic enhanced Al / Si / Al2O3 composite. The aluminum-based composite sample is mainly prepared from one or more of Al, SiO2, CNTs and GNFs. The CNTs and the GNFs are subjected to surface modification through gallic acid and rutin, and through combination with an in-situ reaction and a powder metallurgy technology, a CNTs independently enhanced aluminum-based composite, a GNFs independently enhanced aluminum-based composite and the CNTs and GNFs mixing enhanced aluminum-based composite with an Al / Si alloy as a matrix are prepared. The results show that 1, among the three composites, the 1% CNTs enhanced composite has the most excellent mechanical properties as well as the highest compactness, hardness and tensile strength; and 2, strengthening mechanisms of the CNTs enhanced aluminum-based composite mainly include the thermal expansion coefficient mismatch enhancement, Orowan enhancement and load transfer enhancement. The invention further discloses a preparation method of the aluminum-based composite. According to the method, the process is simple, production is easy, and broad application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite materials, and relates to an aluminum-based composite material, in particular to a GNFs / CNTs synergistically reinforced Al / Si / Al 2 o 3 Preparation methods and mechanical properties of composite materials. Background technique [0002] With the rapid development of aerospace, automobile manufacturing, sports equipment and other industrial fields, the requirements for the quality, strength and other properties of materials have also been continuously improved. Materials are hot spots in the application of various structural materials. [0003] However, in recent years, with the discovery of carbon nanotubes (CNTs) and graphene (Graphene), two low-density nano-carbon materials with excellent properties, aluminum matrix composites using them as reinforcing phases have attracted widespread attention in the scientific community. Attention, many scholars have carried out a lot of work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/00C22C1/05B22F3/15
CPCB22F3/15B22F2999/00C22C1/05C22C21/00C22C21/02C22C26/00C22C2026/002B22F2201/20
Inventor 蒋小松李峰付学敏蒋佳芯邵甄胰朱德贵朱旻昊
Owner SOUTHWEST JIAOTONG UNIV
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