Views: 0 Author: Site Editor Publish Time: 2026-07-20 Origin: Site
1. What are the differences in production processes between graphite sheets and graphene thermal pads?
The raw material for thermal graphite sheets is usually polyimide film) → carbonization (converting polymers into amorphous carbon in an inert atmosphere at 800-1200 ℃) → graphitization (rearranging carbon atoms into layered hexagonal graphite after extreme high temperature treatment at 2500-3000 ℃) → rolling (mechanical compression+shearing, further arranging graphite layers) → film coating (PET support film) or adhesive coating (pressure-sensitive adhesive);
Graphene Thermal pads are made of Oxidized Graphene Sheet → Dispersion (dispersing the oxidized graphene sheet in a medium) → Orientation (coating a suspension on the substrate and heating it to form a graphene film) → Thermal Annealing (treating the film at a temperature of 2800-3800 ℃ in an inert atmosphere) → Pressing (pressing the graphene film at a pressure of 50-300MPa) → Stacking (fixing it by adding adhesive and needle shaped nanoparticles to adjacent graphene films to form the required number of layers) → Curing (heating and pressing the stacked graphene film to achieve curing) → Cutting (precisely cutting along the direction perpendicular to the orientation to obtain the desired thickness of the pad).
2. What is the difference between performance and application?
Through the process, especially the molding process, we can clearly see the difference between the two. Thermal Graphite sheets are flat rolled, while graphene thermal pads are vertically cut after stacking, which results in their performance and application differences.
Thermal graphite pad
Thermal conductivity: High in- (x, y) thermal conductivity, but low vertical (z) thermal conductivity. Main applications: in the field of consumer electronics such as mobile phones and tablets. By utilizing the ultra-high thermal conductivity in the planar direction, the point like heat generated by the chip is quickly diffused onto a large area of the phone back panel or metal frame, thereby eliminating local overheating and achieving overall cooling.
Graphene thermal pad
Thermal conductivity: The cutting direction (x-y) has a low thermal conductivity, while the vertical and other directions (z) have a high thermal conductivity. Main applications: high-end gaming graphics cards, high-power chips for electric vehicles, AI servers and data centers, 5G communication base stations. As a high-performance thermal interface material, it can effectively fill the small gaps between chips and heat sinks, eliminate air with extremely poor thermal conductivity, and establish a "highway" for heat from the heat source to the heat sink with its own ultra-high vertical thermal conductivity.
