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Ultrathin bionic forest-shaped wick structure with high capillary performance and preparation method thereof

A technology of liquid-absorbing core and woods, which is applied in the field of ultra-thin bionic forest-like liquid-absorbing core structure and its preparation, can solve the problems of low porosity, low capillary performance, and heavy weight, and achieve reduced resistance, excellent capillary performance, The effect of high capillary performance

Pending Publication Date: 2021-11-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional liquid-absorbing core structure is a single micron-scale structure, such as metal sintered particles, machined channels, wire mesh, etc., because of its low porosity, heavy weight, and low capillary performance, it can no longer meet the needs of ultra-thin two-phase heat transfer devices. requirements

Method used

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  • Ultrathin bionic forest-shaped wick structure with high capillary performance and preparation method thereof
  • Ultrathin bionic forest-shaped wick structure with high capillary performance and preparation method thereof
  • Ultrathin bionic forest-shaped wick structure with high capillary performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of ultra-thin bionic forest-like liquid-absorbent core structure

[0025] (1) Sample pretreatment: The cathode is made of red copper foil, which is washed with acetone, ethanol, and deionized water in order to remove surface oil and oxide layers, and then dried for later use.

[0026] (2) Copper dendrite deposition: at a ratio of 0.7 M CuSO 4 and 0.75 M H 2 SO 4 In the electrolyte, keep the current growth rate at 0.67-1.33 mA / cm 2 / s, deposited for 160 s, and the obtained samples were washed and dried.

[0027] (3) Carry out high-temperature sintering treatment under the condition of reducing protective atmosphere to further enhance the mechanical strength of the sample, and prepare an ultra-thin bionic forest-like liquid-absorbent core structure.

Embodiment 2

[0028] Example 2: Preparation of ultra-thin bionic forest-like liquid-absorbent core structure

[0029] (1) Sample pretreatment: The cathode is made of red copper foil, which is washed with acetone, ethanol, and deionized water in order to remove surface oil and oxide layers, and then dried for later use.

[0030] (2) Copper dendrite deposition: at a ratio of 0.7 M CuSO 4 and 0.75 M H 2 SO 4 In the electrolyte, keep the current growth rate at 0.67-1.33 mA / cm 2 / s, deposited for 220 s, and the obtained samples were washed and dried.

[0031] (3) Carry out high-temperature sintering treatment under the condition of reducing protective atmosphere to further enhance the mechanical strength of the sample, and prepare an ultra-thin bionic forest-like liquid-absorbent core structure.

[0032] As shown in Table 1, when the thickness of the forest-like structure sample prepared by the present invention is only 53 μm and 101 μm, the porosity is as high as 84%, 87%, which is much hig...

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Abstract

The invention discloses an ultrathin bionic forest-shaped wick structure with high capillary performance and a preparation method thereof. A copper matrix has a natural forest-shaped structure and comprises trunk crystal branches and branches, the trunk and the surface of the matrix form a vertical angle or an inclined angle, and gaps exist between the trunks. The branches are micro-nano particles and comprise a second-stage branch and a third-stage branch. Staggered micron-sized channels are formed among the trunks of the forest-shaped wick structure, so that the flowing supplement of a working medium can be promoted, the resistance of liquid backflow is reduced, and the heat transfer efficiency is improved; and nanoscale channels are formed among the branches, so that capillary force can be provided. Therefore, the forest-shaped wick structure can have high capillary performance under the ultrathin condition, and conditions are provided for application of ultrathin two-phase heat exchange devices.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to an ultra-thin bionic forest-like liquid-absorbing core structure with high capillary performance and a preparation method thereof. Background technique [0002] With the advent of the 5G era, portable devices are developing in the direction of ultra-thin, lightweight, high-performance and long battery life, which poses new challenges to the heat dissipation requirements of electronic chips. Ultra-thin two-phase heat transfer devices emerged as the times require. Due to the reduced thickness, the vapor space and wick thickness are also greatly reduced. Especially for thicknesses < 0.3 mm, a slight change in thickness can cause an exponential increase in thermal resistance. This requires the wick to reduce its thickness as much as possible while ensuring high capillary performance. The traditional liquid-absorbing core structure is a single micron-scale structure, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/04
CPCF28D15/046
Inventor 吕树申赵凡彬罗佳利莫冬传
Owner SUN YAT SEN UNIV
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