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Method for forming low-porosity multi-branch heat dissipation structure through metal droplet printing

A technology of heat dissipation structure and porosity, applied in the field of dendritic radiator preparation, can solve problems such as poor practicability, inability to manufacture complex three-dimensional multi-branched special-shaped heat dissipation structures, etc., to improve thermal conductivity, improve internal quality, and optimize internal quality. Effect

Active Publication Date: 2019-06-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the poor practicability of the existing branch-like heat sink preparation methods, the present invention provides a method for forming a low-porosity multi-branch heat dissipation structure by printing metal droplets
The present invention is not limited by the need for special manufacturing tools for special-shaped structures, and effectively solves the technical problem that the method in the background technology cannot manufacture complex three-dimensional multi-branched special-shaped heat dissipation structures

Method used

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  • Method for forming low-porosity multi-branch heat dissipation structure through metal droplet printing
  • Method for forming low-porosity multi-branch heat dissipation structure through metal droplet printing
  • Method for forming low-porosity multi-branch heat dissipation structure through metal droplet printing

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: The aluminum alloy dendritic heat dissipation structural unit with four branches is formed.

[0022] An aluminum alloy branch-shaped heat dissipation structural unit with four branches is formed. The overall height of the part is 15mm and the width is 10mm.

[0023] Step 1. Open the argon cylinder 1 one hour in advance, make the argon pressure gauge 2 display 0.2Mpa, and clean the glove box 3 with argon until the oxygen content detector 4 shows below 20PPM, and the water content detector The reading of 7 is below 10PPM;

[0024] Step 2: Use 0.1mol / L NaOH solution outside the glove box to soak the aluminum alloy raw materials for 30 minutes, and then wash in nitric acid for 10 seconds to remove the oxide scale on the aluminum alloy surface;

[0025] Step 3. Put the four processed in step two into the crucible 6, and then sequentially assemble the vibration rod 5, the nozzle 11 and the crucible 6 into the heating furnace 8 in the glove box 3;

[0026] Step 4. Set the...

Embodiment 2

[0029] Embodiment 2: Aluminum alloy dendritic lattice array heat sink is formed.

[0030] A dendritic lattice array heat sink is formed. The overall height of the part is composed of a plurality of dendritic structural units with four branches. Compared with the first embodiment, the structure is more complicated, and the dendritic structure needs to be realized The left and right connections and stacking between the units. This embodiment is basically the same as the process of embodiment 1 when applied, and the difference is that the molding time is longer, so the requirements on the environment are higher, and the way of model path planning and printing program generation is different.

[0031] Step 1. Open the argon cylinder 1 2 hours in advance, make the indication of the argon pressure gauge 2 0.2Mpa, clean the glove box 3 with argon, make the indication of the oxygen content detector 4 below 10PPM, and the water content detector The reading of 7 is below 5PPM;

[0032] Step ...

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Abstract

The invention discloses a method for forming a low-porosity multi-branch heat dissipation structure through metal droplet printing. The technical problem that an existing branch heat dissipater preparation method is poor in practicability is solved. According to the technical scheme, metal liquid droplets are produced based on the jet fracture theory, the complex three-dimensional multi-branch profiled heat dissipation structure with the controllable shape and dimension is printed point by point layer by layer by controlling jet of liquid droplets and movement of a movement base plate according to path planning of the profiled heat dissipation structure; and the solidification behavior of the liquid droplets is cooperatively controlled, and the internal quality of the metal droplets is optimized. The limitation that a special manufacturing tool is needed for the profiled structure is avoided, the multi-branch heat dissipation structure is formed through printing of multiple metal liquid droplets, the internal quality of the metal liquid droplets is improved by controlling the solidification behavior of the metal droplets, internal pores of the heat dissipation structure are reduced, and heat conductive performance of the heat dissipation structure can be improved. No laser large-power energy source is needed, and rapid forming of multi-branch profiled heat dissipation structureis achieved without limitation of material varieties and forms.

Description

Technical field [0001] The invention relates to a method for preparing a branch-like heat sink, in particular to a method for forming a low-porosity multi-branched heat dissipation structure by metal droplet printing. Background technique [0002] As aerospace, high-tech weaponry, electronic information and other fields have higher and higher requirements for product integration and reliability, especially for some high-density, high-power systems, the heat generated during operation increases sharply, and the heat dissipation of the system Efficiency presents a huge challenge, but the heat dissipation structure of most systems generally faces the problem of low heat dissipation efficiency; according to modern heat transfer topology optimization theory, the multi-branched aluminum profile structure can greatly reduce the heat dissipation resistance. The thermal resistance can be lower than 5% of the traditional fin structure, which provides a new way to double the heat dissipatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115B22F5/00B33Y10/00B33Y30/00
Inventor 齐乐华崔俊星罗俊张代聪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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