With the development of the times, people’s life is inseparable from the existence of electricity. All kinds of products that need to be driven by electricity are flooded in all aspects of people’s lives. When electrical appliances are operating, heat is inevitably generated due to resistance. If the heat is not dissipated in time, Electrical appliances may be short-circuited due to excessive temperature, so solving the problem of body heat dissipation has become the focus of thermal design engineers.
As a traditional thermal conductive material, thermal grease has always been popular with thermal design engineers. It is a gap-filled thermal conductive material based on silicone resin. Reduce interface thermal resistance. Under normal storage conditions, it will not dry and hard, and has good thixotropy, which is beneficial to people’s use. Since the production process of thermal grease is simpler than other thermal conductive materials, its price phase change is lower.
After years of development, a variety of new thermal conductive materials have come out one after another, and thermal gel, which is joked by industry insiders to replace thermal grease, has gradually attracted the attention of thermal design engineers. Come down to CoolThermo to explain it to you!
Thermal Gel is a soft silicone resin thermal gap filling thermal conductive material with high thermal conductivity, low interfacial thermal resistance and good thixotropy. It is an ideal material for applications with large gap tolerances. It is also a paste-like mixture. Compared with the flowing shape of thermal grease, the use of thermal gel is more like plasticine, and there will be no flow and sedimentation.
Thermal gel combines the advantages of thermal grease and thermal pad, while avoiding the defects of both. Thermal gel is a silicone grease mixed with high thermal conductivity particles (such as alumina, silver powder, etc.), and then cross-linked with low molecular weight siloxane through a heat treatment process, and then a gel is formed.
Thermal gel is a gel state substance between liquid and solid. It not only has the characteristics of shape recovery, strong material cohesion, high heat resistance, good long-term thermal stability, etc., but also has excellent thermal conductivity like thermal grease. Low thermal resistance, can fill voids, and has high adhesion.
The thermal gel is generally packaged in a syringe, and the thermal gel has no gas. It is very convenient and efficient to use as long as it is installed on the dispenser. Thermal grease is generally packaged by filling. Although it can be adjusted in thickness, it cannot be changed to be fluid. It can be screen printed or manually applied. Although it is convenient, manual operation is still used.
The main difference between thermal gel and thermal grease is that the thermal gel does not produce silicone oil precipitation, and the thermal gel can be torn off and reused. The thermal gel only needs a small working pressure when connecting with the heat sink and the chip, generally less than 10psi, low hardness, easy to bend, and has a wide working temperature range.
The thermal gel has very little liquid precipitation during use, and the thermal gel will never be cured after use and will not lose its thermal conductivity. Anyone who has assembled a computer knows that it is necessary to recoat the thermal grease after a period of time. Otherwise, Its dry-solid powdering leads to a significant reduction in thermal conductivity, which also shows that the service life of thermal grease is relatively short among thermal conductive materials.
Although the advantages and performance of thermal gel are different from those of thermal grease, it does not mean that thermal grease should be replaced by thermal gel. Therefore, the areas where thermal gel is generally used are those high-tech products or those with special requirements. Thermal grease is still one of the most widely used thermal conductive materials so far.