▎ 摘　　要

NOVELTY - Preparing graphene-boron nitride nano-tube thermal conducting filler comprises (i) preparing a graphene aqueous solution; (ii) adding urea and boric acid to the graphene aqueous solution and reacting to obtain intermediate products; and (iii) calcining the intermediate product under a protective atmosphere. USE - The method is useful for preparing graphene-boron nitride nano-tube thermal conducting filler. ADVANTAGE - The method: prepares nano-tube thermal conducting filler, which are grown in situ on the surface of grapheme, and covalently connected to graphene by C-N bond; reduces the interfacial thermal resistance of graphene, improves interlayer thermal conductivity of graphene, and doping into the polymer matrix as a filler; adopts hot-pressing process to improve the interfacial bonding ability of the thermally conductive filler and polymer matrix, reduces phonon scattering at the interface, and improves the thermal conductivity of composition materials. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the oriented thermally conductive composition material, comprising doping the obtained graphene-boron nitride nano-tube thermal conducting filler into a polymer solution, then drying and performing hot-pressing; and (2) oriented thermally conductive composition material, comprising a graphene-boron nitride nanotube thermally conductive filler, prepared by using the method for preparing a graphene-boron nitride nanotube thermally conductive filler and a polymer matrix, or prepared by the method for preparing an oriented thermally conductive composition material and the graphene-boron nitride nanotube thermal conductive filler, boron nitride and graphene are connected by a covalent bond.