Ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core and preparation method

A technology of micro-nano structure and liquid-absorbing core, which is applied in the field of heat pipes, can solve the problems of reduced heat transfer efficiency, difficulty in further reducing thickness, and decreased capillary performance, so as to reduce water resistance and air resistance, avoid collapse, and improve overall performance Effect

Pending Publication Date: 2020-10-02
绍兴镭纳激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the liquid-absorbing core required by ultra-thin heat pipes is also decreasing, resulting in an increase in interfacial shear force and a decrease in heat transfer capacity caused by high-speed gas-liquid convection inside the heat pipe.
At present, there are two main development directions: one is to optimize the traditional liquid-absorbent core to meet the requirements of ultra-thin heat pipes, such as sintered copper mesh core prepared by chemical deposition and sintering, or sintering wire mesh, grooves and powder into one Composite liquid-absorbing core structure, this method increases the complexity and cost of the ultra-thin heat pipe manufacturing process, and it is difficult to further reduce the thickne

Method used

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  • Ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core and preparation method
  • Ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core and preparation method
  • Ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core and preparation method

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Experimental program
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Effect test

Embodiment 1

[0044] The preparation method of the ultra-hydrophilic micro-nano structure liquid-absorbing core of the ultra-thin copper alloy vapor chamber comprises the following steps:

[0045] (1) The cover plate or the lower cover plate on the copper alloy soaking plate is used for pre-treatment such as cutting and cleaning. The thickness of the copper alloy cover plate can be 0.2-1 mm, and 0.4 mm is selected;

[0046] (2) The liquid-absorbing core is directly prepared on the copper alloy soaking plate cover plate. According to the shape requirements of the soaking plate for the liquid-absorbing core area, the scanning area of ​​the ultra-fast laser is square, rectangular, cross-shaped, T-shaped, and L-shaped. Shape, I-shape, triangle, bar shape, circle, radial shape and various shapes such as combinations thereof, L-shape is selected in this embodiment, and micro-nano structures are prepared in the above-mentioned shape area;

[0047] (3) Using picosecond laser, the wavelength is near...

Embodiment 2

[0052] The preparation method of the super-hydrophilic micro-nano structure liquid-absorbing core of the ultra-thin aluminum alloy soaking plate comprises the following steps:

[0053] (1) The aluminum alloy soaking plate cover plate is used for pretreatment such as cutting and cleaning, the thickness of the aluminum alloy cover plate can be 0.2-1mm, and 0.3mm is selected;

[0054] (2) The liquid-absorbing core is directly prepared on the vapor chamber cover plate. According to the shape requirements of the vapor chamber for the liquid-absorbing core area, the scanning area of ​​the ultra-fast laser is prepared as a square, rectangle, cross, T-shape, L-shape, Various shapes such as I-shape, triangle, strip, circle, radial shape and combinations thereof, T-shape is selected in this embodiment, and micro-nano structures are prepared in the above-mentioned shape area;

[0055] (3) Using femtosecond laser, the wavelength is green light, the pulse width of femtosecond laser is 10-1...

Embodiment 3

[0060] The preparation method of the super-hydrophilic micro-nano structure liquid-absorbing core of the stainless steel soaking plate comprises the following steps:

[0061](1) The cover plate or the lower cover plate on the stainless steel soaking plate is used for pre-treatment such as cutting and cleaning. The thickness of the stainless steel cover plate can be 0.2-1 mm, and 0.2 mm is selected;

[0062] (2) The liquid-absorbing core is directly prepared on the vapor chamber cover plate. According to the shape requirements of the vapor chamber for the liquid-absorbing core area, the scanning area of ​​the ultra-fast laser is prepared as a square, rectangle, cross, T-shape, L-shape, Various shapes such as I-shaped, triangle, strip, circular, radial and combinations thereof, the present embodiment chooses I-shaped, and prepares micro-nano structures in the above-mentioned shape area;

[0063] (3) Using picosecond laser, the wavelength is near infrared, the pulse width of pico...

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Abstract

The invention discloses an ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core. The ultrathin soaking plate super-hydrophilic micro-nano-structure liquid absorbing core comprises a liquid absorbing core body and a soaking plate cover plate. The liquid absorbing core body is directly prepared on the soaking plate cover plate. The liquid absorbing core body is formedby periodically-distributed micro-arrays and passageways around the micro-arrays. Nano-scale sub-structures are densely distributed on the surfaces of the micro-arrays and the surfaces of the passageways around the micro-arrays, and a micro-nano full-coverage structure containing rich micro-cavities is formed by the micro-arrays, the passageways and the nano-scale sub-structures. A high-surface-energy oxide coating is arranged on the surface of the micro-nano full-coverage structure. Compared with powder spraying sintering of an existing liquid absorbing core and a traditional preparation method of a red copper silk screen liquid absorbing core, the steps of the process of preparing the liquid absorbing core with a laser method are fewer, the flow path is short, the efficiency is high, the structural consistency is good, the stability is high, the comprehensive performance is good, and a lowest heat pipe thickness and an optimal heat dissipation effect can be achieved.

Description

technical field [0001] The invention relates to a liquid-absorbing core for various ultra-thin heat pipes and vapor chambers, especially a high-performance liquid-absorbing core based on a super-hydrophilic micro-nano structure, belonging to the technical field of heat pipes. Background technique [0002] With the rapid development of microelectronics technology and electronic information industry, various electronic devices and devices, especially ultra-thin mobile devices represented by smart phones and tablet computers, are constantly moving towards high performance, integration, miniaturization and lightness. The direction of development, higher chip heat flux density, smaller heat dissipation space, more difficult heat dissipation conditions, put forward higher requirements for the heat dissipation capacity and further miniaturization of heat sinks, and the heat dissipation problem for high heat flux density has become a constraint One of the key limiting factors for th...

Claims

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Application Information

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IPC IPC(8): F28D15/04
CPCF28D15/046
Inventor 不公告发明人
Owner 绍兴镭纳激光科技有限公司
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