▎ 摘　　要

NOVELTY - Manufacture of graphene foam-based sealing material from graphene sheets involves, preparing a graphene dispersion having multiple sheets of a graphene material dispersed in a liquid medium, having a non-carbon element content of 0-50 wt.%, and the dispersion contains a blowing agent having a blowing agent to graphene material weight ratio of 0/1.0-1.0/1.0, dispensing and depositing graphene dispersion to form elongated shapes and removing liquid medium from shapes to form dried elongated graphene shapes, heat treating the dried elongated graphene shapes at a heat treatment temperature (T1) from 500-3200 degrees C at a desired heating rate sufficient to induce volatile gas molecules from non-carbon elements or to activate blowing agent for producing solid graphene foam shapes having a density of 0.01-1.7 g/cm3 or a specific surface area of 50-2600 m2/g, and coating or impregnating solid graphene foam shapes with a binder or matrix material to form sealing materials. USE - Manufacture of graphene foam-based sealing material e.g. O-ring. ADVANTAGE - The method enables manufacture of graphene foam-based sealing material having excellent thermal conductivity, electrical conductivity, thermal stability, compressive elastic deformation, and compressive strength. DETAILED DESCRIPTION - Manufacture of graphene foam-based sealing material from graphene sheets involves, preparing a graphene dispersion having multiple sheets of a graphene material dispersed in a liquid medium, where graphene material is chosen from pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, and/or chemically functionalized graphene, having a non-carbon element content of 0-50 wt.%, and the dispersion contains a blowing agent having a blowing agent to graphene material weight ratio of 0/1.0-1.0/1.0, dispensing and depositing graphene dispersion to form elongated shapes and partially or completely removing liquid medium from shapes to form dried elongated graphene shapes, heat treating the dried elongated graphene shapes at a heat treatment temperature (T1) from 500-3200 degrees C at a desired heating rate sufficient to induce volatile gas molecules from non-carbon elements or to activate blowing agent for producing solid graphene foam shapes having a density of 0.01-1.7 g/cm3 and a specific surface area of 50-2600 m2/g, and coating or impregnating solid graphene foam shapes with a binder or matrix material to form sealing materials.