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Selective laser melting formed graphene reinforced aluminum-based composite material and preparation method thereof

A technology of selective laser melting and composite materials, applied in additive processing, additive manufacturing, metal processing equipment, etc., can solve the problems of poor wettability between graphene and aluminum matrix, affecting the mechanical properties of composite materials, and low graphene content, etc. Achieve the effect of saving materials and energy, shortening working hours, and increasing content

Active Publication Date: 2018-11-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Graphene-reinforced aluminum matrix composites mainly have the following problems: the wettability of graphene and aluminum matrix is ​​poor, graphene is difficult to disperse uniformly in the alloy, which affects the mechanical properties of the composite material, and the graphene content is low

Method used

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  • Selective laser melting formed graphene reinforced aluminum-based composite material and preparation method thereof

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Effect test

Embodiment 1

[0026] A selective laser melting graphene aluminum matrix composite material, the preparation method is as follows:

[0027] 1) Put 2g of graphene and 0.06g of stearic acid in a beaker, add 400ml of ethanol and ultrasonically disperse in an ultrasonic machine to obtain a mixed powder, and freeze-dry the mixed powder; among them, the ultrasonic dispersion time is 0.5h, and freeze-dried Temperature -50℃, freeze-drying time 2h;

[0028] 2) Put the dried powder, spherical silicon powder, and stearic acid in step 1) in a ball mill, fill it with liquid nitrogen and quench it for a period of time, and then conduct vacuum ball milling to obtain modified graphene; modified graphene and silicon The mass ratio of the powder is 1:6, the stearic acid is 1wt% of the spherical silicon powder, the liquid nitrogen quenching time is 0.5 hours, the ball-to-material ratio: 5:1, the speed: 100rpm, and the ball mill is 1h;

[0029] 3) Put the modified graphene, high-purity spherical aluminum powde...

Embodiment 2

[0033] A selective laser melting graphene aluminum matrix composite material, the preparation method is as follows:

[0034] 1) Put 2g of graphene and 0.06g of stearic acid in a beaker, add 400ml of ethanol and ultrasonically disperse in an ultrasonic machine to obtain a mixed powder, which is freeze-dried; the ultrasonic dispersion time is 2h, and the freeze-drying temperature is -40°C. Freeze drying time 6h;

[0035] 2) Put the dried powder, spherical silicon powder, and stearic acid in step 1) in a ball mill, fill it with liquid nitrogen and quench it for a period of time, and then conduct vacuum ball milling to obtain modified graphene; modified graphene and high The mass ratio of pure silicon powder is 1:5, the stearic acid is 1wt% of the spherical silicon powder, the liquid nitrogen quenching time is 2 hours, the ball material ratio: 7:1, the speed: 200rpm, the ball mill: 2h;

[0036] 3) Put the modified graphene, high-purity spherical aluminum powder, and stearic acid ...

Embodiment 3

[0040] A selective laser melting graphene aluminum matrix composite material, the preparation method is as follows:

[0041] 1) Put 2g of graphene and 0.06g of stearic acid in a beaker, add 400ml of ethanol and ultrasonically disperse in an ultrasonic machine to obtain a mixed powder, which is freeze-dried; wherein, the ultrasonic dispersion time is 4h, and the freeze-drying temperature is -20°C. Freeze drying time 8h;

[0042] 2) Put the dried powder, spherical silicon powder, and stearic acid in step 1) in a ball mill, fill it with liquid nitrogen and quench it for a period of time, and then conduct vacuum ball milling to obtain modified graphene; graphene and high-purity silicon The mass ratio of the powder is 1:4, the stearic acid is 1wt% of the spherical silicon powder, the liquid nitrogen quenching time is 4h, the ball-material ratio: 6:1, the speed: 250rpm, and the ball milling is 2.5h;

[0043]3) Put the modified graphene, high-purity spherical aluminum powder, and st...

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Abstract

The invention belongs to the technical field of metal-based composite materials, and in particular relates to a selective laser melting formed graphene reinforced aluminum-based composite material anda preparation method thereof. According to the method, compared with a conventional material removal processing technology, materials and energy sources are saved to the maximum extent through an additive manufacturing process. A graphene / aluminum-based composite material is dispersed uniformly by way of ultrasonic dispersion+freeze drying+liquid nitrogen spherulitic graphite in the step, and graphene of a higher content is dispersed and added by increasing a freeze drying process and a liquid nitrogen quenching process in a dispersing process of dispersing graphene with ethanol in present stage researches. Furthermore, the aluminum-based composite material is prepared through a selective laser melting forming technology, and a product is directly manufactured on a basis of shortening theworking hours and lowering the cost, so that the selective laser melting formed graphene reinforced aluminum-based composite material is suitable for the fields of aeronautical manufacturing, machining, medical, household consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of metal-matrix composite materials, and in particular relates to a graphene-reinforced aluminum-matrix composite material formed by selective laser melting and a preparation method thereof. Background technique [0002] Compared with traditional matrix alloys, aluminum-based composite materials have high specific strength, specific stiffness, excellent high-temperature mechanical properties, low thermal expansion coefficient, and excellent wear resistance. They have very broad applications in aviation, aerospace, automotive, electronics, and transportation industries. application prospects. The light weight, high strength and multi-functionality of composite materials determine its huge development potential. Therefore, aluminum matrix composites have become one of the most commonly used and most important materials in metal matrix composites. Common reinforcements such as silicon carbide, boron carbide, ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F1/00B33Y10/00B33Y40/00C22C1/05C22C1/10C22C21/00
CPCC22C1/05C22C21/00B33Y10/00B33Y40/00B22F2009/043B22F2999/00B22F10/00B22F1/10B22F10/36B22F10/28B22F2201/20B22F2201/11Y02P10/25
Inventor 赵占勇吴利芸白培康刘斌王建宏李玉新王宇李晓峰李忠华
Owner ZHONGBEI UNIV
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