Ordinary radiator 009 - Procurement of large heat sinks

A large heat sink is a device used to dissipate heat from heat-generating electronic components in electrical appliances. It is often made of aluminum alloy, brass, or bronze in plate, sheet, or multi-sheet forms. For example, a relatively large heat sink is required for the CPU (central processing unit) in computers, and large heat sinks are also used in power tubes, deflection tubes, and amplifiers in televisions. Generally, during use, a layer of thermal grease is applied to the contact surface between the electronic component and the heat sink to more effectively transfer the heat generated by the component to the large heat sink, which then dissipates it into the surrounding air. In terms of heat sink materials, each material has different thermal conductivity properties. Arranged from high to low thermal conductivity, they are silver, copper, aluminum, and steel. However, using silver for heat sinks would be too expensive; therefore, the best option is to use copper. Although aluminum is much cheaper as a heat sink material, its thermal conductivity is obviously not as good as that of copper (about 50% of copper's conductivity). Currently, commonly used heat sink materials are copper and aluminum alloy, each with its own advantages and disadvantages. Copper has good thermal conductivity but is relatively expensive, difficult to process, too heavy (many pure copper heat sinks exceed the weight limit for CPUs), has a small thermal capacity, and is prone to oxidation. Pure aluminum is too soft for direct use; only aluminum alloys can provide sufficient hardness. The advantages of aluminum alloys are low cost and light weight, but their thermal conductivity is much worse than that of copper. Some heat sinks combine the strengths of both by embedding a copper plate into the base of an aluminum alloy heat sink. For ordinary users, aluminum heat sinks are sufficient to meet cooling needs. In northern regions during winter heating, radiators are also called heat sinks. Heat sinks play an important role in the composition of radiators; aside from active cooling by fans, evaluating the quality of a large heat sink largely depends on its ability to absorb heat and conduct it.