Foam metal with mixed wet surface and preparation method thereof

A foamed metal and wettability technology, applied in the field of foamed metal, can solve the problems of air bubble escaping obstruction, etc., and achieve the effects of reducing waiting time, improving boiling heat transfer coefficient, and reducing detachment resistance.

Inactive Publication Date: 2019-12-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the skeleton structure of metal foam itself has a serious hindering effect on the escape of bubbles during the boiling heat transfer process, which leads to certain limitations in the application of metal foam under high heat flux conditions.

Method used

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  • Foam metal with mixed wet surface and preparation method thereof
  • Foam metal with mixed wet surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A metal foam with a mixed wettability surface (such as figure 1 shown), the metal foam has a super-hydrophilic surface 1, and the super-hydrophilic surface 1 is figure 2 The way shown in (a) is distributed with superhydrophobic film 2 (hydrophobic point area is 0.5~20mm 2 ), and due to the penetration of the liquid in the metal foam for preparing the film, the surface of the skeleton inside the metal foam is also attached to this super-hydrophobic film.

[0027] The foam metal material is copper, its shape is circular, its diameter is 20mm, its height H is 2mm, and its pore equivalent diameter D is 1mm. The apparent contact angle can reach 0°.

[0028] Its preparation method is as follows:

[0029] 1) Put metal foam into K 2 S 2 o 8 and KOH mixed solution (where K 2 S 2 o 8 The concentration of KOH is 0.08mol / L, and the concentration of KOH is 0.8mol / L. ) for 60 minutes to completely oxidize the surface, rinse with deionized water and dry completely after tak...

Embodiment 2

[0033] A metal foam with a mixed wettability surface (such as figure 1 shown), the metal foam has a super-hydrophilic surface 1, and the super-hydrophilic surface 1 is figure 2 (b) shows that the super-hydrophobic film 2 is uniformly distributed in a linear arrangement at equal intervals (the spacing of the hydrophobic points is 1-20mm, and the area of ​​the hydrophobic points is 0.5-20mm 2 ), and due to the penetration of the liquid in the metal foam for preparing the film, the surface of the skeleton inside the metal foam is also attached to this super-hydrophobic film.

[0034] The foam metal material is copper, its shape is circular, its diameter is 20mm, its height H is 2mm, and its pore equivalent diameter D is 1mm. The apparent contact angle can reach 0°.

[0035] Its preparation method is as follows:

[0036] 1) Put metal foam into K 2 S 2 o 8 and KOH mixed solution (where K 2 S 2 o 8 The concentration is 0.09mol / L, and the concentration of KOH is 0.9mol / L) f...

Embodiment 3

[0040] A metal foam with a mixed wettability surface (such as figure 1 shown), the metal foam has a super-hydrophilic surface 1, and the super-hydrophilic surface 1 is figure 2The inner side of the metal foam shown in (c) is center-symmetrical and annularly distributed with super-hydrophobic films 2 (the spacing between the hydrophobic points is 1-20mm, and the area of ​​the hydrophobic points is 0.5-20mm 2 ), and due to the penetration of the liquid in the metal foam for preparing the film, the surface of the skeleton inside the metal foam is also attached to this super-hydrophobic film.

[0041] The foam metal material is copper, its shape is circular, its diameter is 20mm, its height H is 2mm, and its pore equivalent diameter D is 1mm. The apparent contact angle can reach 0°.

[0042] Its preparation method is as follows:

[0043] 1) Put metal foam into K 2 S 2 o 8 and KOH mixed solution (where K 2 S 2 o 8 The concentration is 0.11mol / L, and the concentration of K...

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Abstract

The invention discloses foam metal with a mixed wet surface and a preparation method thereof. The foam metal comprises a super-hydrophilic surface (1) obtained through a chemical oxidization process and a foam meal surface locally covered by a super-hydrophilic film (2). The foam metal is characterized in that the super-hydrophilic surface (1) is provided with a micro-nano binary surface structure, wherein the main component of the super-hydrophilic film (2) is a high-molecular compound with a hydrophobic group. The foam metal is used in strengthening of boiling heat transfer, can improve boiling heat transfer property, and meets heat dissipation needs of high-integration electronic components and parts and heat exchange equipment with high heat exchange amount. The super-hydrophilic surface (1) in the foam metal has extremely strong lyophilic property, reduces gas bubble separating resistance, improves capillary liquid-absorbing ability, and obviously improves boiling heat transfer property; the super-hydrophilic film (2) which can be locally distributed can quicken a nucleation process of gas bubbles, a boiling start point is reduced, and boiling heat transfer property of foam metal is further strengthened.

Description

technical field [0001] The invention relates to a metal foam with a mixed wettability surface and a preparation method thereof, belonging to the field of metal foam. Background technique [0002] The boiling heat transfer process is widely used in energy, chemical industry, aviation and other fields, and is a widely used phase change heat dissipation technology. Studies have shown that compared with single-phase forced convection cooling technology, the heat transfer coefficient of boiling heat transfer is 1 to 2 orders of magnitude higher. Nevertheless, with the development of various industrial fields, the integration of electronic components and the rapid increase in the heat transfer capacity of heat exchange equipment, the conventional pool boiling heat dissipation scheme has been difficult to meet the heat dissipation requirements of today's industrial equipment. To sum up, improving the boiling heat transfer efficiency and efficiently discharging the heat generated d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/63C23C22/83C09D183/08
CPCC08G77/24C09D4/00C09D183/08C23C22/63C23C22/83
Inventor 施娟冯东阳陈振乾
Owner SOUTHEAST UNIV
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