Industry dynamic

Cooling method of computer CPU thermal grease


The silicone under the computer fan is commonly used as a thermally conductive silicone grease. It is a thermally conductive silicone grease-like compound made from silicone as the main raw material, with the addition of heat-resistant and thermally conductive materials. Silicone grease is mainly used for the thermal conductivity and heat dissipation of electronic components such as power amplifiers, transistors, electronic tubes, CPUs, etc., to ensure the stability of the electrical performance of electronic instruments and devices.

Silicone is a kind of silicone elastomer, its thermal conductivity is slightly higher than ordinary rubber, but compared with thermal grease is much worse, and once the silicone is cured, it is difficult to separate the bonded object. Therefore, we generally choose silicone grease as the medium between the CPU/GPU and the heatsink, and silicone as the heat sink for components such as MOS tubes and graphics memory chips. It is very important for manufacturers to have good silicone grease, as high-end thermal conductive silicone grease can allow CPU/graphics card coolers to perform better than ordinary thermal conductive silicone grease.

  • Working principle.

In heat dissipation/conductivity situations, heat is transferred through contact, the larger the contact surface the higher the heat transfer efficiency, and there are a lot of spaces in the flat contact between the heat generating device and the heat sink, the air in the gaps is not conducive to heat transfer. Therefore, thermal conductive silicone grease is used to fill the gap between the CPU and the heatsink (replacing the original air) as a heat transfer medium to quickly transfer the heat generated by the CPU to the heatsink, so that the CPU's own temperature is reduced.

It is a highly thermally conductive and insulating silicone material that is almost never cured and can be used at temperatures from -40°C to +220°C for a long period of time in its greasy state. It has both excellent electrical insulation and excellent thermal conductivity, as well as low oil separation, high and low temperature resistance, water resistance, ozone resistance and weather aging resistance. It can be widely used in various electronic products, however, generally speaking, the computer will deposit some dust inside the chassis after a period of use, and this dust will affect the CPU/graphics card heat sink and other components to dissipate heat, so the computer needs to be cleaned regularly.

If you still find that the CPU/graphics card temperature is still high after cleaning the computer, and the performance of the cooler we use is sufficient to hold down the CPU/GPU temperature, it means that the thermal grease on the CPU/GPU may have "dried up" over time and needs to be reapplied.Thermal grease is very important for cooling your computer's CPU and its main functions are.

1.The purpose of the silicone grease is to fill the small gaps between the CPU and the heat-conducting copper, thus increasing the efficiency of heat dissipation.

2.The material of the silicone grease also affects the thermal conductivity, for example, the difference between ordinary silicone grease and liquid metal can be up to about 30 degrees Celsius.

3.Without silicone grease, its temperature is much higher than that with silicone grease.

Precautions when applying and replacing thermal grease on computer CPU.The thinner the grease, the better. The more you apply, the better.If the thermal grease is found to have aged (solidified), clean the contact surface of the processor and the heat sink and reapply the thermal grease to ensure good contact between the processor and the heat sink so as not to affect the efficiency of heat dissipation.

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