A gradient aperture porous copper liquid-absorbing core for a loop heat pipe and its preparation method

Abstract

The invention discloses a gradient aperture porous copper liquid absorbent core for a loop heat pipe and a preparation method thereof. The steps are as follows: taking an appropriate amount of sodium chloride particles or anhydrous sodium carbonate particles, grinding and sieving to obtain a particle size of 50-150 μm The pore-forming agent is dried for later use; the electrolytic copper powder with a particle size of 1-10 μm is mixed with the pore-forming agent in a volume ratio of 2:8-4:6, and anhydrous ethanol is used as the ball milling medium, and put into a planetary ball mill together. Carry out ball-milling mixing to obtain the mixture C of copper powder and pore-forming agent with different particle sizes 1 ‑C 4 ; put a certain mass of mixture C 1 ‑C 4 According to the particle size of the pore-forming agent from small to large, from bottom to top, it is placed in a stainless steel mold, and cold-pressed to obtain a tablet; then placed in a tube furnace for vacuum sintering, and finally the internal pore-forming agent is washed to obtain a gradient Porous porous copper wicks. The porous copper absorbent core prepared by the invention has high strength, low density, uniform distribution of pores, high capillary suction force, low thermal conductivity, simple preparation process, low production cost and good heat exchange effect.

Description

technical field [0001] The invention relates to a liquid-absorbing core, in particular to a gradient-aperture porous copper liquid-absorbing core for loop heat pipes and a preparation method thereof, belonging to the technical field of heat transfer. Background technique [0002] With the miniaturization of electronic products and the high integration of electronic chips, the heat flux of electronic chips is increasing, which poses a great threat to the performance, life and operating efficiency of electronic products. Therefore, it is necessary to study efficient, safe and stable heat dissipation methods. Loop Heat Pipe (Loop Heat Pipe) is a new thermal control technology based on heat pipe separation technology. It not only inherits the advantages of high heat transfer efficiency, low heat transfer temperature difference, and low heat transfer thermal resistance of heat pipes, but also has incomparable advantages of traditional heat pipes. Advantages: The internal capilla...

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Problems solved by technology

However, the above structure still does not take into account the steam bubbles formed inside the liquid-absorbent core until the bubble dynamics process in which the diameter gradually increases in the process of detaching from the liquid-absorbent core.

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