Method for identifying artificial graphene film efficiently

Abstract

The invention relates to a method for identifying an artificial graphene film efficiently. The method is mainly used for building unit area quality control standard of the graphene film. According tothe identification method, the quality standard in the standard area is built with regard to each specification of heat conduction graphene film, the quality control is performed by measuring the standard area, since the theoretical carbon content and the shrinkage percent of PI films of different manufacturers and at different specifications are relatively large in difference, the corresponding unit area quality difference of the graphene film is relatively large. Similarly, the lost carbon of the PI film with same specification is relatively large caused by a sintering process to probably cause that the unit area quality of the graphene film is changed, thus, whether large alternation or out-of-control appear in PI manufacturers, the specification and the process or not can be effectively identified by monitoring the unit area quality of the graphene film.

Description

technical field [0001] The invention relates to a high-efficiency artificial graphene membrane identification method, which belongs to the technical field of heat-conducting graphene membranes. Background technique [0002] The artificial heat-conducting graphene film is made of polyimide film (referred to as PI film) after high-temperature carbonization, graphitization, and calendering. It has a layered structure; there are many types and manufacturers of polyimide films, and the quality is uneven. Some manufacturers Low-cost PI films will be used to burn high-grade graphene films, and conventional testing cannot effectively identify them; at present, the main performance indicators for testing artificial heat-conducting graphene films are thermal diffusion, density, and thickness; the density is usually tested with a true density instrument , the test principle is to select a quantitative sample and use argon to fill the graphite gap to convert its real volume and sample m...

AI Technical Summary

Problems solved by technology

[0002] The artificial heat-conducting graphene film is made of polyimide film (referred to as PI film) after high-temperature carbonization, graphitization, and calendering. It has a layered structure; there are many types and manufacturers of polyimide films, and the quality is uneven. Some manufacturers Low-cost PI films will be used to burn high-grade graphene films, and conventional testing cannot effectively identify them; at present, the main performance indicators for testing artificial heat-conducting graphene films are thermal diffusion, density, and thickness; the density is usually tested with a true density instrument , the test principle is to select a quantitative sample and use argon to fill the graphite gap to convert its real volume and sample mass to get the real density. For example: usually 25um standard graphite is strictly fired with 50um PI. Diffusion and thickness will meet the requirements according to the industry's testing methods. If the density is tested with a true density instrument, it will also meet the requirements; if the thickness of the 25um graphene film fired by 38PI is at the lower limit of the standard, the density measured by the drainage method or the thickness method will also easily meet the requirements; therefore This type of product is easy to flow into the terminal, but the performance of the product of this specification will be reduced by 30% during the end use process, so it is necessary to design a new way to identify the performance of artificial heat-conducting graphene film