Liquid absorption core, phase change heat transfer device and preparation method

Abstract

The invention relates to a wick, a phase change heat transfer device and a preparation method. The preparation method comprises the following steps: S100, preparing first copper powder and second copper powder according to a certain mass or volume ratio; s101, the second copper powder is subjected to oxidation treatment, so that a copper oxide layer is formed on the particle surface of the second copper powder; s102, the second copper powder is evenly mixed with the first copper powder, and mixed powder is obtained; s103, the mixed powder is arranged on the inner wall face of the heat pipe and sintered in the protective atmosphere, and a sintered layer is obtained; s104, in the thermal atmosphere, reducing gas is introduced into the heat pipe; and / or, the heat pipe is placed in an acid solution or the acid solution is introduced into the heat pipe, so that the copper oxide layer is removed. According to the preparation method, the defect of excessive sintering easily occurring in the prior art is overcome, the blind hole rate is reduced to improve the permeability, the porosity is improved to improve the flattening resistance and the bending resistance, and the obtained wick has the beneficial effects of effectively preventing dry burning and improving the heat flux of a heat pipe.

Description

technical field [0001] The invention relates to the field of capillary material manufacturing, in particular to a liquid-absorbing core, a phase-change heat transfer device and a preparation method. Background technique [0002] The commonly used wick structures include sintered powder, machined grooves, sintered wire mesh and metal foam. Among them, the sintered powder has high capillary suction force and greatly improves the radial thermal resistance, but the permeability is poor; the machining groove has very small liquid flow resistance and low radial thermal resistance, but it works against gravity. Poor capacity; sintered wire mesh, large liquid reflux resistance, and large radial thermal resistance, poor process repeatability and cannot adapt to the bending of the pipeline; foam metal, due to the gasification and expansion of the blend during preparation, the pores obtained Too big, capillary force is not high. [0003] In the prior art, the more commonly used liqui...

AI Technical Summary

Problems solved by technology

In addition, the gas phase or liquid phase in the blind hole will increase the radial thermal resistance of the condensing end, reduce the wettability and radial suction force of the top surface, and cause the axial backflow of the condensed liquid phase to be small and have large resistance and no Unobstructed, so the evaporating end is prone to dry burning, and the high heat flux that the heat pipe should have fails