Can the CPU not be coated with silicone grease?

Can't. Silicone grease is used to fill the gap and reduce the thermal resistance between the processor and the radiator; without silicone grease, the temperature of the CPU will rise rapidly. The top cover of the CPU and the bottom of the radiator are made of metal, and no matter how perfect the manufacturing process is, their surfaces cannot be guaranteed to be absolutely flat and smooth, which will leave tiny gaps when the two are in direct contact; Because of the existence of these gaps, there will be a small amount of air between the processor and the radiator base, and the air will seriously affect the thermal conductivity efficiency. Therefore, we need to fill these gaps with silicone grease.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

CPU cannot be coated with silicone grease.

Silicone grease is used to fill the gaps and reduce the thermal resistance between the processor and the heat sink. Silicone grease only needs to be applied evenly in a thin layer. Too much or too little will affect the heat dissipation effect.

Without silicone grease, the temperature of the CPU will rise rapidly. Thermal silicone grease plays the role of accelerating heat conduction, conducting heat as a medium, increasing the contact area and filling the pits in the CPU iron cover and the middle of the radiator.

We know that the top cover of the processor and the bottom of the radiator are made of metal (usually aluminum alloy), and no matter how perfect the manufacturing process is, it cannot It can ensure that their surfaces are absolutely flat and smooth, which will leave a tiny gap when the two are in direct contact. In addition, if the player does not install the buckle flat when installing the radiator, it will also cause the bottom of the radiator to warp. There is a gap (a small gap may not have a big impact. If the radiator base is severely crooked, it must be reinstalled).

It is precisely because of these gaps that there will be a small amount of air between the processor and the radiator base, and the air will seriously affect the thermal conductivity efficiency. Therefore, we need to use a filler to fill these gaps, and silicone grease is the most cost-effective and applicable choice. However, don’t think that the more silicone grease you apply, the better. In fact, the thermal conductivity coefficient (W/m·K, also called thermal conductivity) of silicone grease is between 0.8 and 8, which is similar to the thermal conductivity coefficient of copper 377. The ratio is very different, so it can really only be used to fill gaps. Applying too much will become a burden for heat dissipation.

Therefore, it is not possible to apply silicone grease to the CPU. This is because it is for better heat dissipation of the CPU.

Expand knowledge:

Thermal conductive silicone grease is commonly known as thermal paste. Thermal conductive silicone grease uses organic silicone as the main raw material, and is added with The thermally conductive silicone grease compound made of materials with excellent thermal conductivity is used for heat conduction and heat dissipation of electronic components such as power amplifiers, transistors, electron tubes, and CPUs, thereby ensuring the electrical performance of electronic instruments, meters, etc. Stablize.

CPU thermal silicone grease is refined from polymer materials such as organic silica gel body, CPU thermal conductive materials, fillers and other polymer materials. It is mainly used as an accessory to dissipate heat for computer CPUs.

Application scope of CPU thermal grease:

Thermal grease is a kind of material used to fill the gap between the CPU and the heat sink. This material is also called the thermal interface. Material. Its function is to conduct the heat emitted by the CPU to the heat sink to keep the CPU temperature at a stable level, prevent the CPU from being damaged due to poor heat dissipation, and extend the service life.

In heat dissipation and thermal conduction applications, even two planes with very smooth surfaces will have gaps when they contact each other. The air in these gaps is a poor conductor of heat and will hinder the conduction of heat to the heat sink. . Thermal conductive silicone grease is a material that can fill these gaps and make heat conduction smoother and faster.

There are many types of silicone grease on the market, and different parameters and physical properties determine different uses. For example, some are suitable for CPU heat conduction, some are suitable for memory heat conduction, and some are suitable for power supply heat conduction.

The liquid part of thermal silicone grease is composed of silica gel and silicone oil. Most products on the market use dimethyl silicone oil as raw material, and the boiling point of dimethyl silicone oil is between 140°C and 180°C. In between, it is easy to volatilize, oil leakage occurs, and traces of grease will be left on the circuit board. The phenomenon of grease detachment will make customers feel that the silicone grease has dried.

Thermal conductive silicone grease has both excellent electrical insulation and excellent thermal conductivity.

It also has low oil separation (tending to zero), high and low temperature resistance, water resistance, ozone resistance, Resistant to weathering. And it almost never solidifies, and can maintain the grease state during use for a long time at temperatures of -50°C to 230°C. It is an ideal gap-filling thermal conductive medium for electronic components.

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