What is ultrathin graphite sheet?is it any different from the ordinary graphite sheet?
The processing of ultrathin graphite sheet is similar to the ordinary ones:
The expanded graphite powder with purity of >98%, put a certain amount of expanded graphite into the hot pressing die,meanwhile,vibrate the die to make the powder dispersed evenly,then place the die onto the powder compressing machine,set the temperature and pressure,and after that,start to heat pressing.keep this situation for a period of time,then get out the graphite sheet and heat it,and make it went through a double roller mill for several times to make finished product.
The simple process below:
What’s the main application of ultrathin graphite sheet(conductive graphite sheet)?
With the development of the information industry and portable electronic products,heat dissipation has become the bottleneck for the continued development of electronic products,the ultrathin graphite sheet has a good performance of electrical conductivity and thermal conductivity,along the direction of crystal lamellae,the thermal conductivity can be more than 2000W/m.K,and it has an adventage of small expansion coefficient and low density,if it could be widely used,then the problem of the shortage of metal and heat dissipation of electronic components could be solved.
Through research by SEM,XRD and Raman on the microstructure, crystallite orientation etc. we could know the reason that ultrathin graphite sheet has a good performance of electrical conductivity and thermal conductivity,the microstucture of the ultrathin graphite sheet with high crystallization and crystallite orientation exhibited high anisotropy and the degree of the ordering of the surface carbon atom was closly to that of the flake graphite.