DSN Graphite Material Introduction

The existing graphite film series soaking materials mainly include natural graphite sheet, synthetic graphite sheet and graphene. Graphite can be used as a soaking material because of its unique lamellar structure. The extremely high transverse thermal conductivity brought by the lamellar structure can quickly conduct the heat released by the point heat source along the carbon atom layer to achieve the purpose of evenly distributing the heat on the entire . The size of the graphite film produced by Dasen can be cut freely, which is more flexible.

Natural graphite sheet is the first "graphite soaking material" and the earliest soaking material used. Natural graphite sheet is made of high carbon flake graphite by chemical treatment, high temperature expansion and rolling. Due to the extremely low cost of raw materials used in natural graphite, the cost is superior to synthetic graphite and other materials. The main problem of natural graphite is that the structure is prone to defects and the transverse thermal conductivity is not prominent enough compared with artificial materials. Moreover, compared with synthetic graphite, the lamella is prone to defects, which may affect the local soaking performance. Secondly, although the transverse thermal conductivity of natural graphite has been far stronger than most materials, the performance is still at a disadvantage compared with artificial graphite that improves the structural integrity by chemical synthesis methods. Due to poor thermal conductivity, natural graphite is mainly used in low-end fields.

Synthetic graphite sheet is the most mature mainstream graphite soaking material. In order to solve the problem of thickness and longitudinal thermal conductivity of natural graphite, DSN synthetic graphite came into being. Synthetic graphite is a synthetic ultra-thick or multi-layer composite graphite heat dissipation film. Relying on the high thermal conductivity of the graphite sheet, by increasing the thickness or designing multi-layer structure, improve the overall or local thickness, greatly increase the heat flux in the direction of heat transfer, with strong longitudinal thermal conductivity, easy processing and other characteristics, to meet the needs of electronic products. Dasen's single-layer graphite can be up to 100um thick, and there are multi-layer graphite composite structure of the UTS series. At present, synthetic graphite is gradually replacing natural graphite soaking materials.

With the increase of power consumption of electronic products, the high thermal conductivity graphite sheet has gradually developed from the traditional single-layer or thin graphite sheet to the composite or ultra-thick graphite sheet. The key characteristic of PI film fired into high thermal conductivity graphite sheet is thermal conductivity. Single-layer or thin graphite sheet is subject to its own structure and size, thermal conductivity has a certain upper limit, so in some applications that require higher thermal conductivity, thicker multilayer graphite sheet is needed to achieve, and the market share of multilayer graphite sheet is also gradually rising. 

Dasen has the UTS-HS multilayer graphite series, which can be customized according to customer requirements. 150-350um thick graphite sheet can replace the temperature equalization plate. The performance of the UTS-HS solution can be equal to or even better than the vapor chamber solution, with higher reliability and lower cost.