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Production method of heat pipe with porous aluminum core

A porous aluminum and heat pipe technology, applied in the field of heat pipes, can solve the problem of destroying the porous core structure and achieve the effect of increasing porosity

Inactive Publication Date: 2008-10-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using traditional welding technology to directly weld the porous core to the shell will destroy the structure of the porous core, so the connection between the porous core and the shell is also a technical difficulty that needs to be solved

Method used

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  • Production method of heat pipe with porous aluminum core
  • Production method of heat pipe with porous aluminum core
  • Production method of heat pipe with porous aluminum core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a heat pipe with a porous aluminum core, comprising the steps of:

[0027] 1) Preparation of NaCl particles with a particle size of 20 μm:

[0028] Prepare salt with an original particle size of 200-400 μm into a supersaturated salt solution, and then add supersaturated salt solution to the mixed solution of alcohol and acetone according to the volume ratio of supersaturated salt solution: alcohol: acetone = 1:0.5:1. Saturated salt solution, stirred for 60 minutes, and baked at 80°C for 2 hours to obtain NaCl particles with a particle size of 20 μm; image 3 shown;

[0029] 2) Selection of raw materials: 20 μm NaCl particles account for 60% by weight, 6 μm Al powder accounts for 40% by weight, select 20 μm NaCl particles and 6 μm Al powder for later use;

[0030] 3) Mix 20 μm NaCl particles and 6 μm Al powder to obtain mixed powder; place the mixed powder on a 2 mm thick aluminum substrate, the thickness of the mixed powder on the aluminum subst...

Embodiment 2

[0033] A method for preparing a heat pipe with a porous aluminum core, comprising the steps of:

[0034] 1) Preparation of NaCl particles with a particle size of 5 μm:

[0035] Salt with an original particle size of 200-400 μm is prepared into a supersaturated saline solution, and then according to the ratio of supersaturated saline solution:alcohol volume ratio=1:1, the supersaturated saline solution is added to the alcohol, and the solution is allowed to stand for 30 minutes. Bake at 80°C for 2 hours to obtain NaCl particles with a particle size of 5 μm, such as figure 1 shown;

[0036] 2) Selection of raw materials: 5 μm NaCl particles account for 60% by weight, 6 μm Al powder accounts for 40% by weight, select 5 μm NaCl particles and 6 μm Al powder for later use;

[0037] 3) Mix 5 μm NaCl particles and 6 μm Al powder to obtain a mixed powder; place the mixed powder on a 2 mm thick aluminum substrate, the thickness of the mixed powder on the aluminum substrate is 2 mm, an...

Embodiment 3

[0040] A method for preparing a heat pipe with a porous aluminum core, comprising the steps of:

[0041] 1) Preparation of NaCl particles with a particle size of 10 μm:

[0042] Prepare salt with an original particle size of 200-400 μm into a supersaturated salt solution, then add supersaturated salt solution to the alcohol according to the ratio of supersaturated salt solution: alcohol volume ratio = 1:1, stir for 30 minutes, and 80 °C for 2 hours to obtain NaCl particles with a particle size of 10 μm, such as figure 2 shown;

[0043] 2) Selection of raw materials: 58% by weight of 10 μm NaCl particles and 42% by weight of 5 μm Al powder, select 10 μm NaCl particles and 5 μm Al powder for later use;

[0044] 3) Mix 10 μm NaCl particles and 5 μm Al powder to obtain mixed powder; place the mixed powder on a 1 mm thick aluminum substrate, the thickness of the mixed powder on the aluminum substrate is 1 mm, and then use pulse current technology for sintering, The sintering proc...

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Abstract

The invention belongs to the technology field of heat pipes, and particularly relates to a preparation method of a heat pipe with a porous aluminum core. The manufacturing method of the heat pipe with the porous aluminum core is characterized in that the method includes the following steps: (1) material selection: selecting 58-62 wt% of NaCl particles with the diameter being 5-40 Mum and 38-42 wt% of Al powder with the diameter being 5-10 Mum in reserve; (2) mixing the NaCl particles with the Al powder; placing on an aluminum substrate; and then sintering by employing the pulse current technique with the sintering technological parameters of the pre-pressure being 13-17 MPa, the sintering temperature being 570-590 DEG C and the sintering time being 3-5 minutes; and boiling sintering blocks in the water for 35-50 minutes to obtain composite plates with porous aluminum core; (3) welding the obtained composite plates into flat heat pipes, vacuum-pumping, inletting the working medium, and sealing to obtain the heat pipe. The preparation method is characterized by high porosity, controllable pore diameter and tight connection.

Description

technical field [0001] The invention belongs to the technical field of heat pipes, and in particular relates to a preparation method of heat pipes with porous aluminum cores. Background technique [0002] Heat pipe is the most efficient heat transfer element so far, and has important applications in the fields of electronic components and power equipment. It uses the latent heat of phase change to transfer heat from one end to the other. A typical heat pipe consists of a shell, wick and end caps. Pump the inside of the tube to 1.3×(10 -1 -10 -4 After the negative pressure of ) Pa, it is filled with an appropriate amount of working liquid, so that the capillary porous material of the liquid-absorbing core close to the inner wall of the tube is filled with liquid and then sealed. When one end of the heat pipe is heated, the liquid in the capillary wick evaporates, and the steam flows to the other end under a small pressure difference to release heat and condenses into a li...

Claims

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Application Information

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IPC IPC(8): F28D15/02
Inventor 张东明李其仲张联盟
Owner WUHAN UNIV OF TECH
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