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Why are heat sinks mostly made of aluminum?

Dec. 31, 2019

After contacting the heat sink panel, you will find that the heat sink is mostly associated with "aluminum". The heat sink industry is also used to call "aluminum profile heat sink", but there will be questions here: why are heat sinks mostly aluminum Materials as raw materials? What are the advantages of aluminum as a raw material? In order to figure out these problems, in fact, we must trace the source and understand the performance characteristics of extrusion aluminum profiles to find out why aluminum profiles are popular in the heat sink manufacturing industry.

Aluminum profiles use pure aluminum or aluminum alloy as raw materials. After melting, cutting, extrusion and other processes, metal panels with different cross-sectional shapes can be formed. Then they can be used in surface treatment processes such as wire drawing, sandblasting, electroplating, radium engraving silk screen printing, anodizing It can be cast into a heat sink shell with exquisite surface, stable performance and superior quality. The aluminum profile as a raw material has the following characteristics:

1. Lightweight

The density of aluminum profile is only 2.7g / cm³, which is about one third of the density of steel and copper (7.85g / cm³ and 8.9g / cm³), which belongs to light metals. Therefore, for the manufacture of heat sink panels, the aluminum profile is lighter in weight with the same volume, and the lightweight aluminum profile is put into production to manufacture a thin and light heat sink shell, which is in line with the current trend of thinning and thinning electronic products.

2. Corrosion resistance

The working environment of the aluminum extrusion heat sink shell is complex, and the selected raw materials must be able to pass the corrosion resistance. Aluminum can form a dense oxide film on the surface to prevent further corrosion inside, and the aluminum profile after the surface treatment process has better corrosion resistance. Therefore, aluminum profiles can stand on the heels in practical use, and will not affect the aesthetics and heat dissipation performance due to metal corrosion in the later stage.

3. Thermal conductivity

Thermal conductivity is an indispensable performance of heat sink raw materials. The thermal conductivity of aluminum is 204 / W · (m · k), but the hardness of pure aluminum is low and it is easy to deform when heated. The aluminum alloy made of pure aluminum can ensure excellent thermal conductivity and heat dissipation. Device has a long service life. In the industry, copper and aluminum are often compared as raw materials. Although copper is indeed superior to aluminum in terms of thermal conductivity, it cannot achieve light weight and thinness, and the production cost is higher than that of aluminum alloy. Therefore, aluminum heat sinks It is easier to be favored by manufacturers in the market.

Aluminum Extrusion Heat Sink

Aluminum Extrusion Heat Sink

4. Non-magnetic

Non-magnetic is actually an important property of the heat sink case. Among them, the heat sink shell put into audio and electronic products must be non-magnetic. This is to avoid the transmission of interference signals. Aluminum alloys that do not contain iron, cobalt, nickel and other metals are not magnetic, so they will not interfere with the audio. And normal operation of electronic products.

5. Plasticity

The specific tensile strength, yield strength, ductility, and corresponding work hardening rate of metals all affect the range of deformation variables. Therefore, different metals will have different plasticity, while aluminum alloys are easy to forge and have high plasticity Can be widely used in industry.

Custom heat sink extrusion supplier uses Al6063 / Al6061 aluminum alloy in the manufacture of heat sinks. Depending on its superior plasticity, it can be processed into various shapes of heat sinks. Among them, fin heat sinks and sunflower heat sinks are typical representatives. In addition, in the later stage, the surface of the heat sink is processed by drawing, sandblasting, radium carving, silk screen printing, etc., which can give the product more possibilities in appearance. Therefore, it can be customized according to the manufacturers' drawings and samples to meet different industries and Product requirements for heat sink shape.

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