How to choose a heat sink? What are the classifications of heat sinks?

Pay attention to the heat load of the radiator, i.e. the amount of heat dissipated per square meter.

See if the radiator type is safe and comfortable. It is best to use a convection radiator for a large room, which dissipates heat evenly and is safe and comfortable. There are many factors related to the safety performance, among which the working pressure of the radiator is a very important one, and the radiator of 10bar or above should be a reasonable choice for the majority of users.

Whether it can provide good after-sales service, whether there is a professional plumbing measurement and installation team.

4. There is no actual relationship between the size of the radiator and the inlet and outlet water pipes, mainly to see the flow rate of water in the heating, as long as the water flow rate can reach the standard, the heat dissipation can be guaranteed. It is a mistake to think that the size of the inlet and outlet of the heating water pipe is large, and the heat dissipation performance is good.

The name, specification, quantity, **, and amount of the radiator must be indicated on the invoice and contract.

Understand the name, address, contact person, and ** of the sales unit and manufacturer, so that quality problems can be solved in time. **: Blue outfit, blue outfit**There are many related products for sale, you can go to find out.

1. Aluminum extruded heat sink.

Aluminum material due to its soft and easy processing characteristics have been used in the radiator market for a long time, aluminum extrusion technology is simply to heat the aluminum ingot at high temperature, let the aluminum liquid flow through the extrusion die with grooves under high pressure, make the heat sink embryo, and then cut the heat sink embryo after cutting, trenching and other treatments to make a common heat sink.

The cost of aluminum extruded heat sink is low, and the technical threshold requirements are not high, but due to the limitation of its own material, the ratio of the thickness and length of the heat sink can not exceed 1:18, so it is difficult to increase the heat dissipation area in a limited space, so the heat dissipation effect of aluminum extruded heat sink is relatively poor, and it is difficult to be competent for today's rising high-frequency CPU.

2. Plug copper heat sink.

The main materials used in the mainstream heat sink in the market are nothing more than aluminum and copper, and the copper plug process is the product of combining the respective advantages of aluminum and copper.

The copper plugging process is completed by using the principle of thermal expansion and cold contraction, and the copper core is plugged into the aluminum extruded heat sink after heating, and finally the overall cooling is carried out.

Since no third-party medium is used, the Secha copper leasing process can greatly reduce the thermal resistance between the contact surfaces, which not only ensures the tightness of the copper-aluminum bond, but also makes full use of the characteristics of fast heat dissipation and fast heat absorption of copper. This copper plugging process has a moderate cost and good heat dissipation effect, and is the mainstream heat sink type on the market.

3. Pressing method.

That is, a large number of copper or aluminum sheets are stacked on top of each other, and then pressurized on both sides and polished with a cross-section that is in contact with the CPU core and the other side is stretched out and buried as a fin for the heat sink.

4. Forged heat sink.

The forging process is formed by heating the aluminum block and using high pressure to fill the mold, its advantage is that the height of the fin can reach more than 50mm, the thickness is less than 1mm, and the maximum heat dissipation area can be obtained in the same volume, and the forging is easy to get good dimensional accuracy and surface finish.

However, during forging, due to the low plasticity of the metal, it is easy to crack when deformed, and the deformation resistance is large, and a large ton (more than 500 tons) of forging machinery is required, and the product cost is extremely high because of the high cost of equipment and molds.

The heat sink material refers to the specific material used in the heat sink. The thermal conductivity of each material is different, and it is ranked from high to low in order of thermal conductivity, which is silver, copper, aluminum, and steel. However, it would be too expensive to use silver for the heat sink, so the best solution is to use copper.

Although aluminum is much cheaper, it is obviously not as thermally conductive as copper (about 50 percent of copper).

At present, the commonly used heat sink materials are copper and aluminum alloy, both of which have their own advantages and disadvantages. Copper has good thermal conductivity, but it is more expensive, difficult to process, too heavy (many pure copper heat sinks exceed the weight limit of the CPU), small heat capacity, and easy oxidation. The pure aluminum is too soft to be used directly, and the aluminum alloy used can provide sufficient hardness, and the advantages of aluminum alloy are low and lightweight, but the thermal conductivity is much worse than that of copper.

Some radiators take their own strengths and embed a copper plate on the base of the aluminum alloy radiator.

For ordinary users, the use of aluminum heat sinks is enough to meet the heat dissipation needs.

The most commonly used materials for heat sinks are copper and aluminum profiles. The thermal conductivity of copper is good, and the heat dissipation effect is relatively good, but it is high; The thermal conductivity of aluminum is low, and the heat dissipation effect is also lower than that of copper;

The heat sink needs to improve the heat dissipation efficiency, you can use the nano carbon heat sink spraying material of Liwang new materials, and the heat dissipation efficiency of copper and aluminum heat sinks can be increased by 15% and 25% after use.