Important characteristics of thermal conductive graphite sheets for mobile phones

Graphite SheetsAlso known as thermal conductive graphite film, heat dissipating graphite sheet, graphite heat dissipating film, etc., it is a new type of thermal conductive and heat dissipating material with a very obvious thermal conductive and heat dissipating effect. Suitable for uniform thermal conductivity on any surface, with EMI electromagnetic shielding effect.

The important characteristics of thermally conductive graphite sheets include: light weight, low thermal resistance, high thermal conductivity, and so on. In addition, the biggest difference between heat-conducting graphite film and many other heat-conducting and heat dissipating materials is that it can conduct heat uniformly in two directions. When applied to electronic products, it can improve the performance of electronic products while shielding heat sources and components.

By utilizing the plasticity of graphite, we can make a thin sheet of graphite material that resembles a sticker and attach it to the circuit board inside the phone. To be precise, graphite heat sinks actually play a role in heat conduction and evenly distribute heat on the surface, indirectly playing a role in heat dissipation.

According to different performance, thermal conductive graphite film can be divided intoArtificially synthesized heat dissipation graphite filmThere are two main categories: nano composite graphite film and nano composite graphite film. Artificially synthesized heat dissipating graphite film is made by synthesizing graphite at extremely high temperatures, and is a type of graphite film with high crystalline carbon molecules. Nanocomposite graphite film is made from expandable graphite as the basic raw material, which is subjected to high-temperature expansion and ultrasonic vibration treatment. Due to its complex manufacturing process and high cost, its current application is not very extensive.

The main application scope of thermal conductive graphite sheets includes: IC、CPU、LED、 Heat sinks, laptops, mobile phones, communication devices, handheld devices, cameras, and more.

Adhesive processing

In order to better adhere to IC and electronic component circuit boards, it is necessary to perform back adhesive processing on the surface of the heat-conducting graphite sheet, which can be divided into double-sided back adhesive and single-sided back adhesive.

Film processing

Some products require insulation and heat insulation in circuit design, and thermal conductive graphite sheets themselves are conductive. In this case, it is necessary to apply film processing on the surface of the thermal conductive graphite sheets to achieve optimal product performance.

Edge wrapping processing

During the die-cutting process, the edges of graphite are prone to powdering, and sometimes it is necessary to wrap the heat-conducting graphite sheets.

Laptop computers LED、 The graphite film layer on the outer surface of digital camera products is partially detached or very thin. What impact does it have on the operation of the product? If a small amount of graphite film layer detachment does not affect normal operation, no treatment is needed. If there is a lot of detachment, use a 6B pencil to apply the detachment or thin area, and then use a multimeter Rx1K to measure the resistance between any two points on the coating layer (which should not exceed 10-20 kiloohms). To prevent the pencil powder from being knocked off, a layer of clear varnish can be applied as a protective layer.