Industry dynamic

What are the performance advantages of thermally conductive silicone pad?

2021-03-29

What are the performance advantages of thermally conductive silicone pad?

Thermally conductive silicone pad is a high-performance gap filling thermal conductive material, mainly used for electronic equipment and heat sink or product shell between the transfer interface, with good adhesion, flexibility, compressibility, and excellent thermal conductivity, so that it can completely make the air between the original electronic parts and heat sink in use, to achieve full contact, heat dissipation effect is significantly improved.

 1, thermally conductive silicone film in the structure can be achieved in the process of bridging the difference, reduce the heat sink and heat dissipation structure parts of the process of differential requirements, thermally conductive silicone film thickness, softness can be adjusted according to the different designs, so in the thermal conductivity channel can be bridged in the heat dissipation structure and chips and other size differences, reduce the structure of the design of the contact surface of the heat sink parts of the production requirements, especially for flatness, the roughness of the work difference. If the processing accuracy of the contact parts of the thermally conductive material is improved, the cost of the product will be greatly increased, so the thermally conductive silicone film can fully increase the contact area of the heat sink and the heat sink parts, reducing the production cost of the heat sink and contact parts. In addition to the widespread use of thermal conductive silicone film in the PC industry, the new thermal solution for products is now to remove the traditional heat sink and unify the structural parts and heat sink into a thermal structure. In the PCB layout, the heat sink chip is laid out at the back, or in the front layout, heat sinkholes are opened around the chip that needs to be dissipated, the heat is conducted to the back of the PCB through the copper foil, etc., and then the heat sink structure (metal brackets, metal shells) is optimized by filling the PCB with thermal conductive silicone film to establish thermal channels to the bottom or side of the PCB. This not only greatly reduces the cost of the entire thermal solution of the product, but also enables the small size and portability of the product.

2, the range of thermal conductivity and stability, thermally conductive silicone film in the thermal conductivity of a broader range of options, its products can be from 0.8w/k.m ----3.0w/k.m or even above, and stable performance, long-term reliability of use. Compared to the current high thermal conductivity of the double-sided adhesive does not exceed 1.0w/k-m, the thermal conductivity is poor. Compared with the thermally conductive silicone film, it is easy to produce surface drying and cracking or unstable performance at high temperature, and it is easy to volatilize and flow, and the thermal conductivity will gradually decrease, which is not conducive to long-term reliable system operation.

3, shock absorption advantages, the silicone carrier of the thermally conductive silicone film determines its good elasticity and compression ratio, to achieve the effect of shock absorption if the density and hardness can be adjusted to produce low-frequency electromagnetic noise to play a good absorption role. As opposed to the use of thermally conductive silicone grease and thermally conductive double-sided adhesive determines that other thermally conductive materials do not have a damping and sound absorption effect.

4, electromagnetic compatibility (EMC), the performance of insulation. Thermal conductive silicone film has insulating and thermal conductive properties due to its material characteristics and has good protection for EMC because the silicone material is not easy to be pierced and torn or broken under pressure, EMC reliability is better. The thermal conductive double-sided adhesive has low EMC protection due to its material characteristics and often fails to meet customer requirements. The thermal conductivity of silicone grease is also relatively low due to its material characteristics, which often fails to meet customers' needs and is limited in use.

5. Convenience of reusability. Thermally conductive silicone film is a stable solid-state, the strength of the adhesive can be selected, easy to disassemble, and reusable. While the thermal conductive double-sided adhesive once used, not easy to disassemble, there is a risk of damage to the chip and surrounding devices, not easy to disassemble thoroughly. When scraped thoroughly, it can scratch the surface of the chip and bring dust, oil, and other disturbing factors with it when it is applied, which is not conducive to thermal conductivity and reliable protection. The thermal grease must be applied carefully and is not easy to apply thoroughly on average, especially during the replacement of the thermal conductive media.