Recently, some customers have inquired about what kinds of thermal conductive silicone are there? What are the characteristics? What does it do? CoolThermo will share with you.
The main function of thermally conductive silicone is to apply it to heat-generating components to conduct heat and dissipate heat. The performance of ordinary thermally conductive silicone depends on the aluminum hydroxide component incorporated into it. Of course, special thermally conductive silicone grease will incorporate an appropriate amount of precious metal oxides. It is mainly composed of four components: polydimethylsiloxane, aluminum hydroxide, quartz powder, methyltrimethoxysilane, and chelated titanium.
Thermal silica gel can be divided into three states: grease, patch and paste according to the different occasions.
Grease-like: such as thermal grease
Thermal grease is paste-like, sticky (here refers to adhesion), non-drying, and can be used for more than five years under normal circumstances. Thermal grease is mainly used to fill the gap between the CPU and the heat sink. This material is also called thermal interface material. Its function is to conduct the heat emitted by the CPU to the heat sink, keep the temperature of the CPU at a level that can work stably, prevent the CPU from being damaged due to poor heat dissipation, and prolong its service life. Because the heat sink and the thermal conduction device are used in the application, even two planes with very smooth surfaces will have gaps when they are in contact with each other. The air in these gaps is a poor medium for heat conduction, which will hinder the conduction of heat to the heat sink. Thermal grease is a material that can fill these voids, making heat conduction smoother and faster.
SMD shape: such as thermal conductive silicone gasket
When used in industry for large-area heat dissipation such as power supplies, thermal conductive silicone gaskets are required because the cost of thermal conductive silicone gaskets is low, non-drying, easy to replace, and has excellent thermal conductivity. High temperature can reach 300 ℃ , the low temperature is generally -60 ℃. In electronic products, it is generally used on the surface of some electronic parts and chips that generate less heat but is not easy to dissipate heat. It is suitable for simple processing of ordinary devices. On the side of a better battery, a thermally conductive silicone gasket is usually attached. , while conducting heat, it can fill the gap between the battery and the casing, and play a buffering and stable role.
Paste: such as one-component adhesive sealant
One-component adhesive sealant is a thermal interface material. One-component adhesive sealant is a thermally conductive RTV adhesive, a colloid that can be cured at room temperature. The color is white or black or transparent. It needs to react with water vapor in the air. It can only be cured. The biggest difference between one-component adhesive sealant and thermal grease is that one-component adhesive sealant can be cured. After curing, it has certain elasticity, adhesion and extensibility. One-component adhesive sealant has Fixing and bonding properties, so in line with general process sealing. The thermal conductivity of the one-component adhesive sealant is the lowest among the three types of silica gels. It is suitable for the thermal conductivity of components such as capacitors and resistors and the bonding between some heating components. The working temperature of the adhesive sealant is generally not more than 200 ℃.
The above is an introduction of CoolThermo to the types, characteristics and functions of thermally conductive silicone. For more information about thermally conductive silicone, visit www.coolthermo.com.