▎ 摘　　要

NOVELTY - Producing (p1) a unitary graphene matrix composite, comprises (a) preparing a graphene oxide gel having graphene oxide molecules dispersed in a fluid medium, (b) mixing a carbon or graphite filler phase in the graphene oxide gel to form a slurry, (c) dispensing the slurry onto a surface of a supporting substrate or a cavity of a molding tool, (d) partially or completely removing the fluid medium from the slurry to form a composite precursor, and (e) heat-treating the composite precursor to form the unitary graphene composite at a temperature higher than 100 degrees C. USE - The process is useful for producing a unitary graphene matrix composite (claimed) which is useful in thermal management applications (e.g. as a heat spreader) in a microelectronic device, e.g. a mobile phone (including a smart phone), a notebook computer, a tablet, an electronic-book, a telecommunication device, and any hand-held computing device or portable microelectronic device, and a hand-held device, e.g. a power tool, a microelectronic or telecommunication device (e.g. laptop computer and LCD display), a LED lighting device or system. ADVANTAGE - The process: is dramatically faster, less energy-intensive and cost effective; and provides the unitary graphene matrix composite which contains closely packed and chemically bonded graphene planes having an inter-graphene plane spacing of 0.335-0.40 nm and an oxygen content of 0.001-10 wt.% (claimed), exhibits a combination of exceptionally high thermal conductivity, high electrical conductivity, high mechanical strength, good surface scratch resistance and good hardness, and has an in-plane thermal conductivity of greater than 600 W/mK (preferably greater than 1700 W/mK), in-plane electrical conductivity of greater than 2000 S/cm (preferably greater than 10000 S/cm), Rockwell surface hardness value of greater than 60 (preferably greater than 80) and/or a tensile strength of greater than 80 MPa (preferably greater than 200 MPa). DETAILED DESCRIPTION - Producing (p1) a unitary graphene matrix composite, comprises either: (a) preparing a graphene oxide gel having graphene oxide molecules dispersed in a fluid medium, where the graphene oxide gel is optically transparent or translucent, (b) mixing a carbon or graphite filler phase in the graphene oxide gel to form a slurry, (c) dispensing the slurry onto a surface of a supporting substrate or a cavity of a molding tool, (d) partially or completely removing the fluid medium from the slurry to form a composite precursor, and (e) heat-treating the composite precursor to form the unitary graphene composite at a temperature higher than 100 degrees C, where the carbon or graphite filler phase is a carbon or graphite fiber, carbon or graphite nanofiber, carbon nanotube, carbon nanorod, meso-phase carbon particle, meso-carbon micro-bead, exfoliated graphite flake with a thickness greater than 100 nm, exfoliated graphite or graphite worm, coke particle, needle coke, carbon black or acetylene black particle, and/or activated carbon particle; or the step (a) above per se, (b) combining a carbon or graphite filler phase and the graphene oxide gel to form a graphene oxide gel-impregnated shape of fiber yarns or bundles, (c) partially or completely removing the fluid medium from graphene oxide gel-impregnated shape to form a composite precursor, and (d) heat-treating the composite precursor to form the unitary graphene composite at a temperature higher than 100 degrees C. An INDEPENDENT CLAIM is also included for producing (p2) a unitary graphene matrix composite, comprising depositing or dispensing a mixture of a graphene oxide gel and a carbon or graphite phase onto a substrate surface or into a mold cavity, removing a residual liquid from the mixture to form a precursor composite, and subjecting the precursor composite to a heat treatment at least at 150 degrees C for thermal reduction and/or re-graphitization of the graphene oxide to form the graphene matrix composite.