A kind of graphene heat pipe and preparation method thereof

Abstract

The invention discloses a graphene heat pipe and a preparation method thereof. In the invention, the metal tube is shrunk first, and one end is sealed to obtain a tube shell; a core rod is inserted into the tube shell, and graphene slurry is poured into the core rod and the tube shell In the cavity between them; after solidification and cooling, the mandrel is removed to obtain the shell; finally, the unclosed end of the shell with the liquid-absorbing core and the end cap with the filling port are sealed and welded, and then through the filling of the end cap The injection port is filled with a fluid working fluid into the shell and vacuumized, and then the filling port is sealed and welded to obtain a graphene heat pipe. The graphene heat pipe of the present invention is provided with a pore structure containing graphene or graphene/carbon nanotubes to form a passage for the return flow of the fluid working medium, has good heat transfer performance and prolongs life, and graphene or graphite is used when preparing the liquid-absorbing core The olefin/carbon nanotube slurry can be finished by baking at 70-100°C without high-temperature sintering, which can speed up production efficiency and reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of heat pipes, and in particular relates to a graphene heat pipe and a preparation method thereof. Background technique [0002] A typical heat pipe is composed of a tube shell, a liquid-absorbing core and an end cover, and the inside of the tube is pumped into 1.3×(10 -1 -10 -4 After the negative pressure of ) Pa, it is filled with an appropriate amount of working liquid, so that the capillary porous material of the liquid-absorbing core close to the inner wall of the tube is filled with liquid and then sealed. One end of the tube is the evaporating section (heating section), and the other end is the condensing section (cooling section), and an insulating section can be arranged between the two sections according to application requirements. When one end of the heat pipe is heated, the liquid in the wool core evaporates and vaporizes, and the steam flows to the other end under a small pressure difference ...

AI Technical Summary

Problems solved by technology

[0003] The existing technology has the following disadvantages: (1) The preparation process is relatively complicated, and the sintering process in the process: the production of the liquid-absorbing core needs to heat and sinter the copper pipe, and the sintering temperature is relatively high. Generally, the temperature is controlled at 900°C-1000°C, which can (2) The powder filling process in the preparation process: when the copper powder is filled, the copper powder will sinter on the plug and the copper tube, resulting in a great force to take out the plug after sintering, and sometimes it will fail because it cannot be taken out. Waste products are generated, and the waste rate reaches more than 25%; (3) Non-condensable gas is an important factor affecting the heat transfer performance of heat pipes: the working liquid and the tube core produce chemical or electrochemical reactions to produce non-condensable gas, the gas Swept by the steam to the condensing section and gather to form an air lock, thereby reducing the effective condensation area, increasing the thermal resistance, deteriorating the heat transfer performance, decreasing the heat transfer or even failing

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