▎ 摘　　要

NOVELTY - High performance and high thermal conductivity composite material is prepared by adding ethyl silicate, anhydrous ethanol, dilute hydrochloric acid and dimethyldichlorosilane, carrying out micro-ultrasonic reaction to obtain reaction solution (I), adding graphene fiber and ammonium chloride to distilled water, adding initiator, carrying out aeration reaction using ammonia gas, carrying out micro-current catalytic reaction, stirring reaction solution (II) with reaction solution (I), distilling and cooling to obtain final product. USE - High performance and high thermal conductivity composite material used for electronic device. ADVANTAGE - The high performance and high thermal conductivity composite material has thermal expansion coefficient of less than 5 ppm/K, thermal conductivity up to 600-800 W/m.K and density of greater than 99%. DETAILED DESCRIPTION - High performance and high thermal conductivity composite material is prepared by (i) adding ethyl silicate to reaction kettle, adding anhydrous ethanol, stirring, (ii) adding dilute hydrochloric acid and dimethyldichlorosilane, carrying out micro-ultrasonic reaction for 2-4 hours, (iii) adding the reaction solution (I) to sealed reactor for sealing and pressurizing for 2-4 hours, (iv) adding graphene fiber and ammonium chloride to distilled water, heating for 1-3 hours, (v) adding initiator to distilled water, carrying out aeration reaction for 1-3 hours using ammonia gas, carrying out micro-current catalytic reaction for 0.5-1.1 hours, (vi) stirring the obtained reaction solution (II) with reaction solution (I) to obtain precursor solution, (vii) distilling precursor solution for 3-5 hours and aeration cooling to obtain final product.