Material of heat sink fins machine

Heat sink fins machine is a device for radiating easily heated electronic components in electrical appliances. It is mostly made of aluminum alloy, brass or bronze in plate shape, sheet shape, multi sheet shape, etc. for example, a considerable heat sink should be used for CPU in computer, and a heat sink should be used for power tube, line tube and power amplifier tube in TV. Generally, during the use of the heat sink, a layer of thermal conductive silicone grease shall be coated on the contact surface between the electronic components and the heat sink, so that the heat emitted by the components can be more effectively transmitted to the heat sink, and then distributed to the surrounding air through the heat sink.

As for the material of heat sink, the thermal conductivity of each material is different. According to the thermal conductivity, it is silver, copper, aluminum and steel. However, if silver is used as heat sink, it will be too expensive, so the best solution is to use copper. Although aluminum is much cheaper, it obviously has less thermal conductivity than copper (about 50% of copper).

At present, the commonly used heat sink fins machine materials are copper and aluminum alloy, which have their own advantages and disadvantages. Copper has good thermal conductivity, but the price is expensive, the processing is difficult, the weight is too large (many pure copper radiators exceed the weight limit of CPU), the heat capacity is small, and it is easy to oxidize. Pure aluminum is too soft to be used directly. Only aluminum alloy can provide sufficient hardness. Aluminum alloy has the advantages of low price and light weight, but its thermal conductivity is much worse than copper. Some radiators draw on their own strengths, and a copper plate is embedded in the base of the aluminum alloy radiator.

Heat sink fins machine plays an important role in the composition of heat sink. In addition to the active heat dissipation of fan, the evaluation of a heat sink depends largely on the heat absorption capacity and heat conduction capacity of the heat sink itself