▎ 摘　　要

NOVELTY - Preparing graphene-added silicon carbide fiber/silicon carbide complex material comprises e.g. (i) taking graphene, polyvinyl pyrrolidone, ethanol, and silicon carbide ceramic precursor as liquid polycarbosilane or polycarbosilane solution configured by polycarbosilane and xylene solvent, (ii) using polyvinyl pyrrolidone and ethanol to prepare dispersion, adding graphene into dispersion, mechanically stirring, and ultrasonically stirring, (iii) mixing graphene solution and silicon carbide ceramic precursor, mechanically stirring and ultrasonically dispersing, (iv) introducing silicon carbide fiber preform into deposition furnace for pyrolysis carbon interface layer deposition, adding mixed gas of argon and propene, and cooling at room temperature with furnace, (v) soaking into ceramic precursor solution containing graphene, (vi) vacuuming pressure in furnace, and (vii) taking out preform, repeating step (v) and step (vi) for 4-7 times, and finishing densifying. USE - The method is useful for preparing graphene-added silicon carbide fiber/silicon carbide complex material. ADVANTAGE - The method: improves the mechanical properties and thermal conductivity of the material. DETAILED DESCRIPTION - Preparing graphene-added silicon carbide fiber/silicon carbide complex material comprises e.g. (i) taking graphene, polyvinyl pyrrolidone, ethanol, and silicon carbide ceramic precursor as liquid polycarbosilane or polycarbosilane solution configured by polycarbosilane and xylene solvent, (ii) using polyvinyl pyrrolidone and ethanol to prepare dispersion, adding graphene into dispersion, mechanically stirring, and ultrasonically stirring to obtain graphene solution, (iii) mixing graphene solution and silicon carbide ceramic precursor according to volume ratio of 1:2, mechanically stirring and ultrasonically dispersing to obtain ceramic precursor solution containing graphene, (iv) introducing silicon carbide fiber preform into deposition furnace for pyrolysis carbon interface layer deposition, adding mixed gas of argon and propene, and cooling at room temperature with furnace to obtain silicon carbide fiber preform with pyrolysis carbon interface layer, (v) soaking into ceramic precursor solution containing graphene, introducing in pressure dipping furnace, vacuuming, filling with argon for soaking, draining graphene-containing ceramic precursor solution, introducing in argon, heating, preserving heat, cooling at room temperature with furnace, and finishing curing, (vi) vacuuming pressure in furnace, heating, keeping temperature, continuously heating up, keeping warm, and cooling down with furnace, and (vii) taking out preform, repeating step (v) and step (vi) for 4-7 times, and finishing densifying.