▎ 摘　　要

NOVELTY - Preparation of graphene-modified ceramic matrix composite material involves mixing graphite oxide and deionized water, ultrasonically processing mixed solution until solution color is turned into bright yellow, centrifuging mixed solution, removing undispersed graphite oxide to obtain graphene oxide solution, adding hydrazine hydrate, adjusting pH of solution to 6-7, adding obtained solution to autoclave and carrying out reduction reaction to obtain uniform and stable dispersion of graphene solution and pretreating quartz fiber profiled fabric. USE - The method is useful for preparing graphene-modified ceramic matrix composite material, which is useful for wave transmission window and antenna housing of missile weapon system. ADVANTAGE - The method ensures preparation of graphene-modified ceramic matrix composite material with excellent stealth and wave transmission properties and electromagnetic wave shielding property. The ceramic matrix composite material improves defense penetration capability of missile weapon system. DETAILED DESCRIPTION - Preparation of graphene-modified ceramic matrix composite material involves (a) mixing graphite oxide and deionized water in a ratio of 0.7-l mg:1 ml, ultrasonically processing mixed solution for 1-3 hours until solution color is turned into bright yellow, centrifuging mixed solution for 10-20 minutes, removing undispersed graphite oxide to obtain graphene oxide solution, adding 1-3 %mass hydrazine hydrate to solution, adjusting pH of solution to 6-7, adding obtained solution to an autoclave and carrying out reduction reaction at 150-300 degrees C for 8-20 hours to obtain uniform and stable dispersion of graphene solution, (b) pretreating quartz fiber profiled fabric by placing quartz fiber profiled fabric in boiling water, boiling for 25-45 hours, drying, introducing oxygen, calcining at 250-400 degrees C for 1-3 hours, again placing quartz fiber profiled fabric in boiling water, boiling for 10-15 hours and drying, (c) immersing pretreated quartz fiber profiled fabric in silica sol with density of 1.30-1.35 g/cm3 under -0.09 MPa to -0.1 MPa for 1-2 hours, impregnating by assisted vibration for 30-50 minutes to improve impregnation composite effect, removing cover braid of impregnated composite and drying at 100 plus minus 20 degrees C for 10-20 hours, (d) repeating step (c) for 1-3 times until quartz fiber profiled fabric has hardened stereotypes, (e) immersing quartz blank in silica sol with density of 1.30-1.35 g/cm3 under -0.09 MPa to -0.1 MPa for 1-2 hours, heating in a water bath until silica sol continuous evaporates water, increasing density and drying at 60-120 degrees C for 1-20 hours, (f) repeating step (e) for 1-4 times, (g) heat-treating impregnated quartz fiber profiled fabric composite to form ceramic blank and machining ceramic blank to obtain product with desired size, (h) pretreating obtained product with N,N-dimethylformamide and then impregnating in stable dispersion of graphene solution under vacuum of -0.08 MPa to -0.1 MPa for 1-3 hours and drying at 100-150 degrees C for 1-20 hours, (i) repeating step (h) for 1-3 times, and (j) coating silicone resin on a surface of obtained product and curing.