Views: 10 Author: Site Editor Publish Time: 2021-01-27 Origin: Site
In the field of heat dissipation, the heat sink is an indispensable important component. In addition to its own heat dissipation, some industries will also configure cooling fans for combined heat dissipation. The heat dissipation effect is an important indicator to measure the performance of the components. The size of the heat dissipation coefficient depends on the choice of materials. And heat transfer capacity also depends on the rationality of the heat dissipation process. Shengyida is the leading aluminum heat sink manufacturer in China, has more than 10 years of experience in the heat sink industry. This article classifies six commonly used heat sink models for research reference.
1. Aluminum heat sink
The aluminum heat sink is one of the most widely used heat sinks, and the whole is made of aluminum alloy. As a metal with a higher content in the earth's crust, aluminum is mainly characterized by low cost, but it releases heat quickly, and its heat dissipation is proportional to its structure and workmanship. There are many heat sinks, the bottom surface is polished, and the heat dissipation is good, but it is also produced by it. Due to the limitation of the process, the heat sink groove spacing of the aluminum extrusion type production process is generally small, only 1.1 mm. The heat dissipation principle is also relatively simple: use the heat sink on the heat sink to increase the contact area with the air, and then use the fan to accelerate the airflow, thereby taking away the heat on the heat sink. The price of this heat sink is relatively low, and the heat dissipation effect is worse compared with the following types of heat sinks.
2. Copper heat sink
Compared with aluminum heat sinks, copper heat sinks are more different in that copper is used as the heat sink material, because copper has an inherent advantage compared with aluminum: the thermal conductivity is 412 w/mk, which is higher than aluminum's 226 w/ The MK is nearly doubled, but copper also has a congenital shortcoming: the heat conduction efficiency is too high, that is, the heat sink absorbs heat quickly but releases heat slowly, and the heat in the copper sheet deposits a lot, and it needs to be matched with a high-power, high-speed fan, In order to achieve the desired effect. Copper parts have good toughness, and the manufacturing process is easier than aluminum parts, such as folding, rack, etc. The heat sink has a higher density than aluminum parts, and the heat dissipation area is correspondingly increased. These can compensate for the heat dissipation caused by excessive capacity. The disadvantage of slowness, but the unit cost and manufacturing cost of pure copper are much higher than that of aluminum parts, which directly leads to high prices. Although the price is high, the heat dissipation effect is much better than aluminum parts.
3. Steel heat sink
The steel heat sink is made of special thin-walled steel pipe. Its obvious advantages are high compressive strength, not easy to burst, and the service life can reach several decades. The steel heat sink has good heat dissipation and a high heat dissipation rate. Therefore, to heat the same area of the room, the use of a steel heat sink is much smaller than a traditional cast-iron heat sink, which can save a lot of space. The steel heat sink has rich styles and diverse shapes, Its height ranges from 0.26 meters to 2 meters, and there are more than a dozen specifications. It can also be made into an angular or arc shape according to the room structure to fully meet the different needs of users.
4. Copper and aluminum composite heat sink
The copper-aluminum composite heat sink solves the contradiction between copper and aluminum in an economical way. The copper is embedded in the middle to contact the CPU, and the rapid heat absorption of copper is used to absorb the heat of the CPU, and then the rapid heat release of aluminum is used. To release the heat on the copper block, which is much better than pure copper or pure aluminum for heat dissipation. The reason is simple: the manufacturing process of the embedded copper heat sink is based on the principle of thermal expansion and contraction. After the aluminum sheet is heated to a certain temperature, And then insert the prefabricated copper block. When the aluminum temperature decreases, the copper block shrinks, but the contact between copper and aluminum cannot reach 100%, so the heat transfer efficiency will be affected to a certain extent, but the advantage is that the price is cheap and relatively For a pure copper heat sink of tens of yuan, its cost is lower and the effect is better.
5. Die casting heat sink
Die-cast heat sinks are similar to copper-embedded heat sinks. There is also a piece of copper on the base, but the situation is different: the copper block on this type of heat sink is not embedded by the principle of thermal expansion and contraction like copper-embedded heat sinks, but adopts With advanced die-casting technology, it can be said to be completely seamless. Therefore, no matter how you look at the connection between the copper block and the aluminum seat, no matter how you look at it, you will never feel the gap, which fundamentally guarantees the connection between the copper block and the aluminum seat. Thermal conductivity, therefore, the heat dissipation effect is very good.
6. Heat pipe heat sink
The heat pipe heat sink is different from the above heat sink. The heat sink uses the heat transfer characteristics of metal to transfer heat from the small heat dissipation area of the CPU to the large heat dissipation area. Therefore, its heat dissipation performance depends on the material used to make the heat sink. The heat pipe heat dissipation system does not use the heat transfer characteristics of metal but uses the evaporation and condensation process of the liquid medium in the closed copper tube to transfer heat. Since the conversion of liquid to gas and gas to liquid requires absorption and release of a large amount of heat, heat pipe transfer The thermal efficiency is very high, and the thermal conductivity is several orders of magnitude higher than that of a single metal material.