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Modified graphene-reinforced aluminum matrix composite material and preparation method thereof

A technology for strengthening aluminum-based and composite materials, applied in the field of aluminum-based composite materials, can solve the problems of not considering the interface between graphene and aluminum alloy, and achieve the effect of mass production

Active Publication Date: 2017-03-15
YINBANG CLAD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this ball milling process, only the dispersion of graphene in aluminum alloy is considered, and the interface bonding between graphene and aluminum alloy and the wettability between graphene and aluminum alloy are not considered.

Method used

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  • Modified graphene-reinforced aluminum matrix composite material and preparation method thereof

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preparation example Construction

[0031] Depend on figure 1 , the invention discloses a method for preparing a modified graphene-reinforced aluminum-based composite material, comprising the following steps:

[0032] ①Put graphene powder, silicon powder, grinding balls, and stearic acid in a ball mill, and feed liquid nitrogen into the ball mill. After the liquid nitrogen immerses all the balls, perform ball milling to obtain a mixture of graphene powder and silicon powder. powder. In this step, the weight ratio of silicon powder and graphene powder is: 0.4-0.6:1, the weight ratio of grinding ball and mixed powder is 5-10:1, the speed of ball mill is 20-100rpm, and the time for ball milling is 3~8h.

[0033] Among them, stearic acid is a solid surfactant, which can attach to the unsaturated broken bonds on the surface of powder particles, reduce the interfacial energy between powder particles, thereby producing a grinding aid effect on the pulverization of powder particles, which is beneficial to the powder ...

Embodiment 1

[0047] ①Put silicon powder (70g), graphene powder (180g), balls and stearic acid in a ball mill, fill with liquid nitrogen, and start ball milling when all balls are submerged in liquid nitrogen. The weight ratio of balls to mixed powder is 10, the speed of the ball mill is 20rpm, and the ball mill is 8h.

[0048] ② Dry the obtained mixed powder of silicon powder and graphene in a vacuum drying oven at a temperature of 90° C. for 2 hours.

[0049] ③ Place the dried mixed powder in a vacuum sintering furnace and sinter at 1300°C for 1 hour.

[0050] ④ Mix the sintered modified graphene (250g), high-purity aluminum powder (750g), balls and stearic acid in a ball mill, fill it with liquid nitrogen and ball mill for 2 hours, and mix the balls with the modified graphene-aluminum The weight ratio of powder to powder mixture is 10, and the rotational speed of the ball mill is 50 rpm.

[0051] ⑤ Dry the finally obtained modified graphene-aluminum powder mixed powder in a vacuum dryi...

Embodiment 2

[0055] ① Put silicon powder (70g), graphene powder (150g), balls and stearic acid in a ball mill, fill it with liquid nitrogen, and start ball milling when all the balls are submerged in liquid nitrogen. The weight ratio of balls to mixed powder 8, the speed of the ball mill is 60rpm, and the ball mill is 5h.

[0056] ②Dry the obtained mixed powder of silicon powder and graphene in a vacuum drying oven at a temperature of 100° C. for 1 h.

[0057] ③ Place the dried mixed powder in a vacuum sintering furnace and sinter at 1200°C for 1.5h.

[0058] 4. Mix the sintered modified graphene (220g), high-purity aluminum powder (780g), balls and stearic acid in a ball mill, fill it with liquid nitrogen and ball mill for 3 hours, and mix the balls with the modified graphene-aluminum The weight ratio of the powder mixed powder is 8, and the rotational speed of the ball mill is 20 rpm.

[0059] ⑤ Dry the finally obtained modified graphene-aluminum powder mixed powder in a vacuum drying ...

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Abstract

The invention discloses a modified graphene-reinforced aluminum matrix composite material and a preparation method thereof. The method includes the steps that graphene powder, silica powder, grinding balls and stearic acid are placed into a ball grinding mill, liquid nitrogen is filled in till all the grinding balls are immersed and then ball milling is performed, and mixed powder is obtained and dried; the dried mixed powder is sintered, so that modified graphene is obtained; the modified graphene, high-purity aluminum powder, grinding balls and stearic acid are put into the ball grinding mill, liquid nitrogen is filled in for ball milling, modified graphene-aluminum powder mixed powder is obtained, and drying is further performed; and the dried modified graphene-aluminum powder mixed powder is added into a molten aluminum or molten aluminum alloy solution to be evenly stirred, and casting is carried out. By the adoption of the method, graphene is modified, good wettability between the graphene and an aluminum matrix can be obtained, and the bonding strength of the graphene and the aluminum matrix is improved. By blending different molten aluminum or molten aluminum alloy solutions, graphene-reinforced aluminum matrix composite material billets of various specifications can be obtained by means of casting, and batch production is achieved.

Description

technical field [0001] The invention relates to the field of aluminum-based composite materials, in particular to a modified graphene-reinforced aluminum-based composite material with good wettability between graphene and an aluminum matrix and a preparation method thereof. Background technique [0002] Graphene is a flat film of hexagonal honeycomb lattice composed of carbon atoms. Graphene has high electrical conductivity (resistivity is only about 10 -8 Ω·m), high thermal conductivity (5000W / m·K), high strength (breaking strength up to 130Gpa) and high specific surface area, making it an ideal reinforcing phase for composite materials. Graphene powder is composed of graphene microflakes ranging from 1-10 layers. Potential downstream applications are for conductive additives, composite materials, heat dissipation and heat conduction, conductive inks, energy storage, seawater desalination, anti-corrosion materials, etc. Relevant studies have shown that adding graphene to ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/02C22C21/00C22C32/00
CPCC22C1/1005C22C1/1036C22C21/00C22C32/0084C22C1/1047
Inventor 杨柳夏承东伍波谭军李龙周德敬
Owner YINBANG CLAD MATERIAL
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