With the continuous intelligentization of electronic products, as the "hub" of the Internet, Netcom products are developing in the direction of high speed, high quality, and easy integrated management, which puts forward higher requirements for the quality of Netcom products. With the development of the industry, mobile phones will be smarter, with higher configurations, faster computing speeds, and higher and higher CPU frequencies. For multi-functional, multi-tasking smart phones, such as running large software or games for a long time, the temperature of CPU, LCM and other devices will become higher, and the performance will drop sharply. Like all electronic devices, only within a suitable temperature range In order to ensure the normal and long-lasting operation of the device. Therefore, on the one hand, heat dissipation is to ensure that these devices are not burned out, and on the other hand, to ensure that they all work quite well. At the same time, because WIFI and other communication devices have to transmit and receive signals, they also generate a lot of heat with the effective signal transmission and reception. When the temperature is too high, the mobile phone will activate the self-protection mechanism and automatically power off. Affect the normal use of mobile phones.
Everyone imagine a scene where a user suddenly crashes when he is playing at the highest point of a game or when he is watching the climax of a movie. Does he have the urge to drop the phone? Will he still trust this mobile phone brand? It can be seen that if you want to meet the higher requirements of users, it is very necessary for the mobile phone to have a good heat dissipation system.
However, the rapid increase in operating frequency, work intensity, and network speed has brought about the problem of increased power for Netcom products, and consequently higher heat dissipation requirements. As an "auxiliary material" of electronic products, thermal interface materials can help electronic products improve heat dissipation efficiency, increase operating speed, stability, reliability and service life, and are an indispensable part of their thermal design.
Thermally Conductive Graphite Sheet
Graphite heat dissipation film is actually a thermally conductive graphite sheet, also called graphite heat sink. It is a nano-advanced composite material that is suitable for uniform heat conduction on any surface and has EMI electromagnetic shielding effects.
The chemical composition of graphite heat sink is mainly a single carbon (C) element, which is a natural element mineral. Graphitized films can be obtained by chemical methods at high temperature and high pressure. Because carbon is a non-metallic element, it has the conductivity of metal materials. Thermal conductivity, plasticity like organic plastics, and special thermal properties, chemical stability, lubrication and coating on solid surfaces, etc. Some good process performance, graphite heat sink has 150-1500 in the plane Ultra-high thermal conductivity in the range of W/mK.
The main characteristics of graphite heat sink: ultra-high thermal conductivity / easy to operate, low thermal resistance, light weight. It has been widely used in the heat dissipation of communication industry, medical equipment, SONY/DELL/Samsung notebooks, mobile phones, PC memory sticks, LED substrates, etc.
Using the plasticity of graphite, we can make the graphite material into a sheet like a sticker and attach it to the circuit board inside the mobile phone. To be precise, the graphite heat sink actually plays the role of heat conduction, and evenly spreads the heat on the surface, indirectly, it plays the role of heat dissipation.
Features of thermal conductive graphite sheet:
1. The surface can be combined with metal, plastic, stickers and other materials to meet more design functions and needs.
2. Low thermal resistance: thermal resistance is 40% lower than aluminum and 20% lower than copper
3. Light weight: 25% lighter than aluminum and 75% lighter than copper
4. High thermal conductivity: The graphite heat sink can be smoothly attached to any flat and curved surface, and can be cut in any form according to customer needs.
The heat dissipation principle of graphite thermal film:
Physical photos
Thermal graphite sample
Cases of heat dissipation analysis of various brands of mobile phones:
Xiaomi cell phone
Huawei cell phone
OPPO cell phone
