Heat sink in the circuit
The heat sink is a device for dissipating heat from electronic components that are easy to heat in electrical appliances. They are mostly made of aluminum alloy, brass or bronze in plate, sheet, and multi-sheet shapes. For example, the CPU central processing unit in the computer needs to be quite large. The heat sink, the power tube in the TV, the line tube, and the power amplifier tube in the power amplifier must use the heat sink. Generally, the heat sink should be coated with a layer of thermally conductive silicone grease on the contact surface of the electronic component and the heat sink during use, so that the heat emitted by the components can be more effectively transferred to the heat sink, and then radiated to the surrounding air through the heat sink.
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 radiators exceed the weight limit of the CPU), small heat capacity, and easy to oxidize. Pure aluminum is too soft to be used directly. The aluminum alloy used 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 take their own strengths and embed a copper plate on the base of the aluminum alloy radiator.
Aluminum extruded heat sink.
This is an excellent heat dissipation material widely used in modern heat dissipation. Most of the industry uses 6063 T5 high-quality aluminum, whose purity can reach more than 98%. It has strong thermal conductivity, low density and low price, so it has been favored by major manufacturers . Based on the thermal resistance of Intel and AMD CPUs and the consideration of their heat generation, aluminum extrusion manufacturers formulate corresponding molds, heat the aluminum ingots to a certain temperature to change the physical form, and then get out of the mold. We have all kinds of raw materials for heat sinks we want; we can use them by cutting, grooving, polishing, deburring, cleaning, and surface treatment.
Aluminum casting heat sink.
Although the price of aluminum extruded heat sink is low, the manufacturing cost is also low, but it is limited by the soft texture of the aluminum itself. The ratio of the thickness of the fin to the height of the fin generally does not exceed 1:18, so each PC manufacturers continue to increase the heat dissipation area, while the heat dissipation space remains unchanged, the manufacturers proposed a more suitable solution, encrypting the fins, thereby increasing the number of fins; bending the fins, thereby increasing the heat dissipation Area; heating the aluminum ingot from solid to liquid through the mold, and then cooling it becomes the heat sink we want.
Aluminum cutting heat sink
Although it solves the effect that this aluminum extrusion cannot achieve from the heat dissipation area, the precision of the mold now directly affects the overall shape and heat dissipation capacity of our heat sink, so more manufacturers have begun to think of using precision tools for processing machinery. Directly cut the block of aluminum ingots to the shape we want, so that there will be no deformation during the processing, and various impurities will not enter the heat sink during the aluminum extrusion process, which can also make our The heat dissipation area is maximized.
Copper cutting heat sink.
After using the aluminum extruded heat sink for such a long time, no matter how we change our processing technology, it is difficult to meet the increasing heat generation of the CPU. Some manufacturers have to spend money on the cost and seek copper instead of aluminum. Due to the heat conduction of copper The coefficient is much larger than that of aluminum, and the doubled increase in thermal conductivity is of great benefit to our heat dissipation. However, because the hardness of copper is much greater than that of aluminum, it is a severe test for the manufacturing process during the processing. Therefore, the traditional extrusion molding process can no longer be applied to copper, and has to be processed in this way of cutting.
Fitted heat sink
The heat pipe is a major discovery in the field of heat transfer in recent years, and it is also the first major heat dissipation material used in the heat dissipation of notebook computers and major high-end communication industries. Due to its amazing heat conduction speed and recyclable physical characteristics, it makes our heat dissipation easier and creates unlimited possibilities.
