Three major classifications and applications of thermal conductive silicone gel
Release time:
2025-01-13
Thermal conductive silicone is widely used in electronic appliances, mainly for the thermal conductivity and heat dissipation function of heating components. The performance of ordinary thermal conductive silicone depends on its incorporation of aluminum hydroxide components. However, there are also special thermal conductive silicone grease that may be doped with a certain amount of precious metal oxides. So, thermal conductive silicone can be classified into three states when used in field applications: oily (thermal conductive silicone grease), paste (thermal conductive paste), and patch (thermal conductive gasket).
Oil like (thermal conductive silicone grease) is the one with the highest thermal conductivity among the three states. Thermal conductive silicone grease is in the form of a paste, sticky, and non drying, and can generally be used for more than four years. Thermal conductive silicone grease is mainly used as a material to fill the gap between the CPU and the heat sink, and this material is called thermal interface material in the industry. Its function is to conduct the heat emitted by the CPU to the heat sink, keeping the CPU temperature at a stable working level, effectively preventing the CPU from being damaged due to poor heat dissipation, and extending its service life. Even if the two surfaces of the radiator and the hot air element are smooth, there will be gaps when they come into contact, and the air in the gaps is a poor medium for heat conduction, which will seriously hinder the conduction of heat to the heat sink. At this time, thermal grease comes in handy and plays its due role.
Paste like (thermal conductive paste) is a type of adhesive material that can be cured at room temperature. It appears white or black in color and needs to react with water vapor in the air before it can be cured. The biggest difference between thermal conductive paste and thermal conductive silicone grease is that thermal conductive paste can be cured and has a certain degree of elasticity, adhesion, and elongation after curing. Thermal conductive paste has fixed and adhesive properties, so it conforms to general process sealing. In terms of thermal conductivity, thermal conductive paste is exactly the opposite of thermal conductive silicone grease, and it is the one with the lowest thermal conductivity. Therefore, it is generally used for thermal conductivity of components such as capacitors and resistors.
The cost of surface mount (thermal pad) is relatively low. It has the characteristics of easy replacement and non drying, and is generally suitable for easy processing of ordinary devices. A thermal pad is usually attached to the edge of the battery to fill the gap between the battery and the casing, and also to provide cushioning and stability. Due to the relatively low thermal conductivity of this material, it is generally not suitable for high-end electronic products (such as computer CPUs).
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