Method for smearing liquid metal on heat generating surface or heat conducting surface

Abstract

A method for smearing liquid metal on a heat generating surface or a heat conducting surface is suitable for coating the heat generating surface or the heat conducting surface of a target object, andthe method for smearing comprises an squeezing injecting step and a uniform coating step. In the squeezing injecting step, the liquid metal is squeezed out of an injector into the heat generating surface, the heat conducting surface or other containers. In the uniform coating step, a tool is in contact with the liquid metal, force is applied to the liquid metal to destroy the cohesion of the liquid metal, and then the tool is operated to perform smearing back and forth so that the heat generating surface or the heat conducting surface is uniformly coated with the liquid metal. The cohesion ofthe liquid metal is destroyed by applying the external force, so that the liquid metal is not spherical any more, and finally, the heat generating surface or the heat conducting surface of the targetobject is uniformly coated with the liquid metal by driving the tool back and forth, so that the effects of overcoming the cohesion of the liquid metal and achieving uniform coating are achieved.

Description

technical field [0001] The invention relates to a smearing method, in particular to a smearing method of liquid metal on a heating surface or a heat conducting surface. Background technique [0002] Liquid metal is a low-melting-point alloy that is liquid and fluid at room temperature. It has the advantages of stable properties, non-volatile, safe and non-toxic. Compared with ordinary solid metals, the atomic structure of liquid metals is more similar to crystals. Liquid metal, which makes liquid metal have higher thermal conductivity and specific heat capacity, even higher than traditional silicone grease (Silicone Grease), therefore, liquid metal is often used as a high-power heat sink for mechanical tools or electronic products. Thermal field. Gallium-based liquid alloy is one of the common liquid metals. Its composition is gallium indium tin alloy, and gallium accounts for more than half of the composition. Gallium is a light blue metal with a very low melting point and...

AI Technical Summary

Problems solved by technology

[0003] The surface tensions of gallium, indium, and tin liquid metals are 718mN / m, 556mN / m, and 865mN / m, respectively. Compared with the cohesion of ordinary water, which is only 72.75mN / m, gallium-based liquid metals obviously have a higher surface Tension, surface tension is the cohesive force caused by the van der Waals force between molecules, which will cause the liquid to reduce its surface area to reduce the unsatisfied chemical potential. Since the sphere has the smallest area of ​​​​the outer surface under the same volume, it is in In the absence of external force, the liquid is always in a spherical shape in equilibrium. In other words, gallium-based liquid metal with high surface tension will lose its Strong cohesive force maintains the spherical shape, so it cannot fully touch the surface of the CPU, GPU or heat sink, resulting in a discount in thermal conductivity

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