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What is the effect of thermal conductive silicone grease?

Date: 2018-12-26
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Browse: 36

The best thermal conductivity in the world is metal, not silicone grease, so why should we apply silicone grease? If the surface of radiator and CPU metal cover is as smooth as a mirror, then they can fully contact to achieve the best thermal conductivity. But this is impossible. The heat sink and the metal cover of CPU look smooth and smooth. In fact, with a magnifying glass, we can see many pits and holes in the metal surface, which lead to many holes in the middle of the contact surface. These holes are very obstructive to heat dissipation. Silica grease is a liquid, which can fill these holes, improve the contact of the heat dissipation surface, and make heat dissipation. The effect is better than when there is no thermal conductive silicone grease. But if the thermal conductive silicone grease is too thick, it will become a film in the middle of the contact surface, which hinders the direct contact of metals, worse than the non-thermal conductive silicone grease. Therefore, the best way to coat thermal conductive silicone grease is to allow metal to directly contact, but also can fill the metal surface of those small pits, such effect is the best.

Thermal conductive silicone grease is widely used in heat dissipation, filling or coating of electronics, electrical appliances and non-components to derive the heat generated by components. Such as filling gap between CPU and radiator, high power triode, thyristor element, filling gap between diode and base material (aluminum, copper), power amplifier and radiator, semiconductor refrigeration, etc. Reduce the working temperature of the heating element.


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In the end, only about 30-40% of the input energy is converted into light energy, while the remaining 60-70% of the energy is converted into heat energy mainly in the form of lattice vibration caused ...
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