There are two ways to combine Vapor Chamber and Graphene and deliver super cooling effects:
- Attach graphene sheets to the condenser plate of the vapor chamber. Graphene sheets, as an excellent 2D heat spreading materials with thermal conductivity of 5300 W/mK (defect less Graphene), assist the heat dissipation of the vapor chamber and improve its heat performances. Huawei adopted this method and applied to its Mate 20X cell phone and deliver super cooling effects.
image modified from pokde.net
- Another method is to incorporate the carbon materials into the wick structures inside vapor chambers, as shown in the following Figure, since carbon nanotubes have thermal conductivity of 3000W/mK for multi wall nanotubes or 3500W/mK for single wall nanotubes, meanwhile only 400W/mK for copper.
Image from Purdue University
Mitsuo et. al. from Sony and Prof. Suresh Garimella’s team deposited carbon nanotube on sintered powder. They found that the heat spreader developed can dissipate at least 8.5 W/mm2 when using a micro-structured sintered particle wick evaporator. Further, nano-structuring the sintered particles with CNTs further reduces thermal resistance of up to 20-37% relative to a bare sintered surface.
Part of the above results are cited from “Proceedings of the 14th International Heat Transfer Conference”