Method for refining 3D printing aluminum alloy grains and improving thermal conductivity of 3D printing aluminum alloy grains

A 3D printing, aluminum alloy technology, applied in the direction of carbide, titanium carbide, metal processing equipment, etc., can solve the problem that 3D printing aluminum alloy is difficult to meet the requirements of grain refinement and thermal conductivity improvement at the same time, and 3D printing technology is not applicable , complex process and other issues, to achieve high actual thermal conductivity value, performance enhancement, and good wetting effect

Active Publication Date: 2021-05-04
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method is complex and not suitable for 3D printing technology
[0005] Therefore, the existing 3D printed aluminum alloys are difficult to meet the requirements of grain refinement and thermal conductivity improvement at the same time.

Method used

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  • Method for refining 3D printing aluminum alloy grains and improving thermal conductivity of 3D printing aluminum alloy grains
  • Method for refining 3D printing aluminum alloy grains and improving thermal conductivity of 3D printing aluminum alloy grains
  • Method for refining 3D printing aluminum alloy grains and improving thermal conductivity of 3D printing aluminum alloy grains

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Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, the specific steps of this embodiment are as follows:

[0043] (1) Select spherical aluminum alloy powder with a particle size in the range of 15-63 μm.

[0044] (2) Put Ti 2 The C-MXene two-dimensional nanosheet material was evenly spread in the crucible and placed in a vacuum tube furnace. After vacuuming, the temperature was raised to 1200 °C at a rate of 10 °C / min, then kept for 2 h, and then naturally cooled to room temperature.

[0045] (3) Ti obtained by heat treatment 2 The C-MXene two-dimensional nanosheet material and ball milling medium were put into a vacuum ball mill tank under the protection of inert gas to seal and then ball milled. The ball milling speed was 120r / min, the ball milling time was 4h, and the mass ratio of the ball to material was 5:1. . Ti 2 C-MXene two-dimensional materials are ground into figure 2 Smaller volume discrete nanosheets are shown.

[0046] (4) Ti after ball milling 2 The C-MXene two-dimensiona...

Embodiment 2

[0050] The concrete steps of this embodiment are as follows:

[0051] (1) Spherical 7075 aluminum alloy powder with a particle size in the range of 15-63 μm is selected, and its macroscopic appearance is as follows image 3 shown.

[0052] (2) Put Ti 3 C 2 - The MXene two-dimensional nanosheet material was evenly spread in the crucible and placed in a vacuum tube furnace. After vacuuming, the temperature was raised to 1200°C at a rate of 10°C / min, then kept for 2h, and then naturally cooled to room temperature.

[0053] (3) Ti obtained by heat treatment 3 C 2 -The MXene two-dimensional nanosheet material and ball milling medium were put into a vacuum ball mill tank under the protection of an inert gas to seal and then ball milled. The ball milling speed was 120r / min, the ball milling time was 4h, and the mass ratio of the ball to material was 5:1. Ti 3 C 2 -MXene two-dimensional nanosheet material is ground into smaller discrete nanosheets.

[0054] (4) Ti after ball m...

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Abstract

The invention discloses a method for refining 3D printing aluminum alloy grains and improving the thermal conductivity of the 3D printing aluminum alloy grains. The method comprises the following steps: (1) carrying out high-temperature heat treatment on an MXene two-dimensional nano lamellar material; (2) carrying out ball milling treatment on the MXene subjected to heat treatment and a ball milling medium; (3) performing colloid mixing on the MXene subjected to ball milling treatment and the aluminum alloy spherical powder; (4) grinding and screening after drying treatment to obtain the composite powder for selective laser melting forming; and (5) conducting selective laser melting forming on the composite powder obtained in the step (4) to form the aluminum alloy, and after forming is finished, an aluminum alloy formed part is obtained after natural cooling. According to the method, the MXene two-dimensional nano lamellar material is used as a nano additive to promote grain refinement; and meanwhile, the thermal conductivity of the alloy is improved by utilizing the characteristics of high thermal conductivity and large adhesion area of the lamellar structure.

Description

technical field [0001] The invention belongs to the technical field of 3D printing of metal materials, and in particular relates to a method for refining 3D printing aluminum alloy grains and improving the thermal conductivity thereof. Background technique [0002] With the strong growth in the demand for lightweight and structural and functional integration, the application of aluminum alloys is becoming more and more extensive. Especially in the fields of electronic communication, aerospace and aviation, the requirements for thermal conductivity and comprehensive mechanical properties of aluminum alloy materials are getting higher and higher. However, for some special-shaped parts and complex thin-walled structural parts, traditional processing methods are difficult to prepare. Selective Laser Melting (SLM)) technology uses a focused laser beam to selectively melt metal or alloy powder layer by layer and accumulate it into a metallurgically bonded, compact entity. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00B22F10/28C01B32/921B33Y70/10B82Y40/00
CPCB22F9/04C01B32/921B33Y70/10B82Y40/00B22F2009/041C01P2004/24C01P2002/20B22F1/065B22F1/10
Inventor 杜宇雷苏艳蔡建宁
Owner NANJING UNIV OF SCI & TECH
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