Porous special-shaped composite wick micro heat pipe and preparation method thereof

Abstract

The invention discloses a porous special-shaped composite wick micro heat pipe and a preparation method thereof. A wick structure is formed by sintering copper powder and a copper capillary tube, and the wick structure adopts a plurality of porous structures. An evaporation section of a sintered copper powder part adopts large pores, a condensation section adopts small pores, and the pore size of a heat insulation section is between that of the large pores and the small pores; the risk of bubble blocking can be reduced through the large pores in the evaporation section, the bubble separation speed is greatly increased, the capillary condensation effect is enhanced through the small pores in the condensation section, and condensation of cold end gas is accelerated; the multi-direction pore structure of the sintered copper powder provides more space for gas to escape from the evaporation section and enter the condensation section, and the transverse pore structure of the copper capillary tube provides strong capillary force for liquid backflow; and the boiling heating area and the condensation cooling area can be increased through the large hot end area and the large cold end area of the wick, the heat insulation section is designed to be narrow so that a large channel can be provided for airflow, rapid circulation of the airflow is guaranteed, and heat transfer is integrally accelerated.

Description

technical field [0001] The invention relates to the field of micro heat pipes, in particular to a micro heat pipe with porous special-shaped composite liquid-absorbing core and a preparation method thereof. Background technique [0002] With the rapid development of micro-devices and the rapid increase in the integration of electronic chips, the heat flux formed per unit area has risen rapidly. High heat flux has become an important factor affecting the life of electronic chips. The narrowing of product space makes heat dissipation a huge challenge. Traditional heat dissipation methods are difficult to meet the demand. Micro heat pipe technology with strong phase change heat transfer capability is developing rapidly. Micro heat pipes have become one of the most efficient heat dissipation solutions due to their high thermal conductivity, high reliability, and no need for external drivers. [0003] The micro heat pipe relies on the gas-liquid phase change of the internal work...

AI Technical Summary

Problems solved by technology

The larger area of ​​the hot end and cold end of the liquid-absorbing core can increase the boiling heating area and the condensation cooling area, and the narrower design of the insulation section can provide a larger channel for the airflow, ensure the rapid circulation of the airflow, and speed up the heat transfer as a whole. It solves the technical problems of small airflow channel, small capillary pressure, low permeability, slow evaporation and condensation, and low heat transfer of the existing liquid-absorbing core micro-heat pipe

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