Aluminum radiator
Features
Aluminum heat sinks, although slow in heat absorption, but emit heat quickly, the heat dissipation effect is proportional to its structure and workmanship. The more heat sinks, the better the bottom polish, the better the heat dissipation effect, but it is also constrained by its manufacturing process. Generally, the minimum spacing of the heat sink grooves in the aluminum extrusion manufacturing process can only be 1.1 mm.
The principle of heat dissipation is also the simplest: use the heat sink on the heat sink to increase its contact area with the air, and then use the fan to accelerate the air flow and take away the heat on the heat sink. The heat capacity of the aluminum heat sink is low and the heat release is fast. The device works better. It is much cheaper than copper heat sinks.
Copper heat sinks, with high heat, use copper heat sinks to dissipate heat. Because aluminum does not achieve the former effect, with heat dissipation this is the leading advantage of copper over aluminum. But its high heat capacity means that the heat sink absorbs heat quickly, but it emits heat slowly. There is a lot of heat in the physical deposition of copper. Need to cooperate with high-power and high-speed fans to achieve the desired results. The heat sinks for both types of materials have their own strengths and can be purchased according to their own needs.
Production Process
1.Aluminum extruded heat sink
Aluminum materials have been used in the radiator market since they were soft and easy to process. Aluminum extrusion technology is simply to heat aluminum ingots at high temperatures. The aluminum liquid flows through the grooved extrusion die under high pressure The heatsink embryos were made, and then the heatsink embryos were cut, grooved, etc., and then made into our common heat sink.
Aluminum extruded heat sinks have low cost and technical thresholds are not high, but due to their own material limitations, the ratio of the thickness and length of heat sink fins must not exceed 1:18. Therefore, it is difficult to increase the heat dissipation area in a limited space, so the heat dissipation effect of aluminum extruded heat sinks is relatively poor, and it is difficult to be qualified for today's increasingly high-frequency CPUs.
2. Plug copper heat sink
At present, the main material used in the mainstream of the heat sink is no more than aluminum and copper, and the plug copper process is precisely the combination of the advantages of aluminum and copper came into being. The plug copper process is accomplished by the principle of thermal expansion and contraction. After the aluminum extruded heat sink is heated, the copper core is inserted into it, and finally the entire cooling is performed. Because no third-party media is used, the plug-copper technology can significantly reduce the thermal resistance between the contact surfaces, not only ensuring the tightness of copper-aluminum bonding, but also making full use of the characteristics of fast heat dissipation of aluminum and fast heat absorption of copper. This plug-in copper process has moderate cost-effective heat dissipation and is the mainstream type of heat sink on the market.
3. Compression method
That is, stacking a large number of copper or aluminum sheets. Then press on both sides and polish the cross-section. This section is in contact with the CPU core, and the other side is spread out as a fin for the heat sink. The heat sink produced by the press-hardening method is characterized by a large number of fins that can be made. And without a very high process, every fin can be kept in good contact with (or close to) the CPU core. The fins are also in close contact with each other by means of pressure fixation, and the heat conduction loss between them is also significantly reduced. It is precisely because the heat sink produced by the compression method has a large number of fins. The heat dissipation effect of such a heat sink is often good, and the weight is much lighter than the conventional heat sink.
4. The cutting heatsink
Compared to aluminum extruded heat sinks, the cutting process solves the limitation of the ratio of the thickness of the fins of the heat sink.
The cutting process is the use of special tools to cut the entire piece of material out of a layer of fins, The heat sink fins can be as thin as 0.5 mm, and the fins and the base of the heat sink are integrated so that no interface impedance problem occurs.
However, this kind of cutting process has many wastes in the process of production, and the impact of low volume yield leads to high cost, so the cutting process is mainly biased towards copper heat sinks.
5. Flexible heat sink
The flexible heat sink is a thin plate made of copper or aluminum, which is formed into a one-piece fin by a molding machine. Then, the upper and lower substrates are fixed by a piercing die, and then a high-frequency metal fusion splicer is used to integrate the processed base.
Because the process is continuous bonding, it is suitable for high heat-to-length ratio heat sinks, and because the fins are integrally formed, it is conducive to the continuity of heat conduction. The thickness of the fins is only 0.1mm, which can greatly reduce the material requirements and allow the weight of the heat sink. The maximum heat transfer area is obtained within.
