Heat Sink Aluminum Extrusion For PFGA

  The heat sink is an essential and important component in the field of heat dissipation. In addition to its own heat dissipation capacity, some industries will also install a cooling fan to build a  combined thermal module, The heat dissipation effect is an important indicator to measure the performance of the heat sink. The material selection, heat transfering ability and feasible process determining the heat dissipation coefficient of the heat sink.

 The aluminum alloy heat sink extrusion is one of the most widely used heat sinks at present, and the heat sink is made of pure aluminum. Aluminum, as a metal with high content in the earth's crust, has low cost and low heat capacity. Although it absorbs heat not so fast as copper, it releases heat quickly. The heat dissipation effect is proportional to its structure and workmanship. The better the bottom is polished, the better the heat dissipation effect it has, but it is also restricted by its manufacturing process. Generally, the small interval of the heat sink gap using the aluminum extrusion manufacturing process can only be 1.1 mm. The principle of heat dissipation is also relatively simple: using the fins on the heat sink to expand its contact area with the air, and then using the fan to accelerate the air flow to take away the heat on the heat sink. The price of this heat sink is also relatively low, and the heat dissipation effect is poor compared with high performance heat sinks like heat pipe heatsinks and vapor chamber heat sinks.

The Process of Aluminum extruded heat sink

  First of all, we need to understand that the production process of aluminum extruded heat sink mainly includes casting, extrusion and coloring (the coloring is mainly divided into oxidation, electrophoretic coating, fluorocarbon spraying, wood grain transfer and other technologies) Let's take a look at the main aluminum heat sink extrusion production process: 

The first step (ingredients): According to the required aluminum alloy grades, calculate the amount of various alloy components added, so as to match the appropriate raw materials;

The second step (smelting): the prepared raw materials are added to the melting furnace for melting according to the requirements of the process, and the impurity residue gas in the furnace is removed by refining treatment such as degassing and slag removal during this period;

The third step (melting and casting): The molten aluminum that has been melted and cast passes through a certain casting process condition and passes through a deep well casting system, and is cooled and cast into round cast rods of various specifications;

The fourth step (extruding): According to the section design of the profile product, a mold is manufactured, and the heated round cast rod is extruded into the desired shape in the mold by an extruder;

The fifth step (oxidation): The surface corrosion resistance of the extruded aluminum alloy profile is not strong enough. At this time, anodizing or powder spraying is required for proper surface treatment to increase the corrosion resistance, wear resistance and corrosion resistance of the aluminum alloy, also it can improve the appearance of the heat sink. 

The oxidation process is mainly: ① Surface pretreatment: The surface of the profile is cleaned by chemical or physical methods (pickling or alkali cleaning) to expose the pure substrate, which is conducive to obtaining a complete and dense artificial oxide film , Mirror or matt  surface can also be obtained by mechanical means. ②Anodizing treatment: Under certain process conditions, the surface of the pretreated profile will undergo anodization on the surface of the substrate to form a dense, porous, and strong absorbing Al2O3 film. ③ Sealing: The pores of the porous oxide film formed after anodization are sealed, so that the anti-pollution, corrosion resistance and wear resistance of the oxide film are enhanced. The oxide film itself is colorless and transparent, but using the strong adsorption of the oxide film before sealing, some metal salts are adsorbed and precipitated in the die hole, which can make the appearance of the profile show other colors other than its original color (silver white). , such as black, golden yellow, bronze and so on.

Product specifications

Varieties of heat sink

Thermal simulation

Factory and workshop



Extruding process



Certificates

Sinda Thermal heat sink extrusions range from flat back structure to complicated shape for thermal improving or space requirements. The material of the extrusions is AL6063 or AL6061 as they are very good thermal conductors. We can offer the standard aluminum heat sink extrusion profiles for customer to select, if customer want to build the custom extrusions, we can build the extrusion tooling die and manufacture the extrusions as customer required, for the rapid prototype for testing, we also can use the CNC to machine the heat sink prototypes.

Sinda Thermal offers high quality heat sinks and best service to our global customer, our company is consist of thermal experts and experienced operators, we provide widely range of heat sinks not just aluminum extruded heat sinks, we can also supply copper heat sinks, soldering heat sinks, skived fin heat sinks, bonded fin heat sinks, cold forging heat sinks, die casting and other procedure heat sinks. Most of the manufacturing process is completed in house, so we can offer a very competitive price than some trading companies. If you have any thermal requirements, please feel free to contact us, we will provide our most professional service and best thermal option.

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