Thermally conductive silicone sheet is specially produced for the design scheme of using the gap to transfer heat. It can fill the gap and complete the heat transfer between the heating part and the heat dissipation part. It has manufacturability and usability, and its thickness has a wide range of applications. Material. According to years of industry experience, Hongfucheng has concluded that the advantages of thermally conductive silicone sheets include the following aspects.
(1) Range and stability of thermal conductivity
Thermally conductive silica gel sheet has a large selectivity in terms of thermal conductivity, which can be from 0.8w/k.m to...3.0w/k.m or more, and has stable performance and long-term use;
At present, the highest thermal conductivity of thermally conductive double-sided adhesive does not exceed 1.0w/k-m, and the thermal conductivity is not ideal; thermal conductive silicone grease is a normal temperature curing process, which is prone to surface cracking at high temperatures, unstable performance, easy to volatilize and flow, and thermal conductivity will decrease. Gradual decline is not conducive to long-term reliable system operation.
(2) Bridging the process difference in structure, reducing the process difference requirements of radiators and heat dissipation structural parts
The thickness and hardness of the heat-conducting silicone sheet can be adjusted according to different designs, so in the heat-conducting channel, it can bridge the size difference between the heat dissipation structure and the chip, and reduce the work difference requirements for the contact surface of the heat dissipation device in the structural design, especially for the Flatness and roughness work difference, if the processing accuracy is improved, the product cost will be greatly increased, so the thermal conductive silicone sheet can fully increase the contact area between the heating element and the heat dissipation device, and reduce the production cost of the radiator.
In addition to the traditional PC industry, the new heat dissipation solution is to remove the traditional heat sink and unify the structural parts and heat sinks into a heat dissipation structure. In the PCB layout, the cooling chip is arranged on the back, or in the front layout, heat dissipation holes are opened around the chip that needs to be cooled, and the heat is conducted to the back of the PCB through copper foil, etc., and then filled with a heat-conducting silicone sheet to establish a heat conduction channel to the PCB. The lower or side heat dissipation structure (metal bracket, metal shell) optimizes the overall heat dissipation structure and reduces the cost of the entire heat dissipation solution.
(3) EMC, insulation performance
The heat-conducting silicone sheet has insulation and heat-conducting properties due to its material properties, and has good protection against EMC. The reason why the silicone material is not easy to be pierced and torn or damaged under pressure, the EMC reliability is better;
Thermally conductive double-sided adhesive is limited by the characteristics of the material itself. Its EMC protection performance is relatively low, and it often fails to meet customer needs. It is relatively limited in use. Generally, only the chip itself is insulated or the chip surface is EMC protected. can only be used when
The EMC protection performance of thermal conductive silicone grease is also relatively low due to the material characteristics. In many cases, it cannot meet customer needs, and its use is relatively limited. Generally, it can only be used if the chip itself is insulated or the chip surface is EMC protected.
(4) The effect of shock absorption and sound absorption
The silicone carrier of the thermally conductive silicone sheet determines that it will have good elasticity and compression ratio, so that it has a good shock absorption effect, and then adjusting the density and hardness can produce a good absorption effect on low-frequency electromagnetic noise; thermally conductive double-sided adhesive The way of bonding and using determines that it does not have the effect of shock absorption and sound absorption.
(5) Ease of installation, testing, and reusability
The heat-conducting silicone sheet is stable and solid, with optional glue strength and easy disassembly; it has elastic recovery and can be reused;
Once the thermally conductive double-sided adhesive is used, it is not easy to disassemble, there is a risk of damaging the chip and surrounding devices, and it is not easy to disassemble completely. When scraping thoroughly, it will scratch the surface of the chip and bring dust, oil and other interference factors when wiping, which is not conducive to heat conduction and reliable protection;
Thermal grease cannot be disassembled, and must be carefully wiped, and it is not easy to wipe thoroughly. Especially in the test of changing the thermal medium, it will affect the reliability of the test data, thereby affecting the judgment of the engineer.
