▎ 摘　　要

NOVELTY - Producing carbon fiber-boron nitride composite, comprises: (a) surface treating carbon fiber with at least one acid solution including nitric acid and sulfuric acid to form hydroxy or carboxy functional groups on the surface of the carbon fiber; (b) adding a crosslinking agent containing an amine group to the surface-treated carbon fiber and reacting; (c) adding graphene oxide to the carbon fiber reacted with a crosslinking agent containing the amine group and reacting the graphene oxide to be coated on the carbon fiber; and (d) flowing a gas containing nitrogen into boron trioxide powder and the graphene oxide-coated carbon fiber contained in a crucible, and reacting while being heat-treated such that the graphene oxide is replaced with boron nitride. USE - The method is useful for producing carbon fiber-boron nitride composite. ADVANTAGE - The carbon fiber-boron nitride composite has excellent crystallinity, can be suppressed from being oxidized in a high temperature oxidizing atmosphere of carbon atoms constituting the carbon fiber, and can withstand at ultra-high temperature oxidizing atmosphere. DETAILED DESCRIPTION - Producing carbon fiber-boron nitride composite, comprises: (a) surface treating carbon fiber with at least one acid solution including nitric acid and sulfuric acid to form hydroxy or carboxy functional groups on the surface of the carbon fiber; (b) adding and reacting a crosslinking agent containing an amine group to the surface-treated carbon fiber; (c) adding graphene oxide to the carbon fiber reacted with a crosslinking agent containing the amine group and reacting the graphene oxide to be coated on the carbon fiber; and (d) flowing a gas containing nitrogen into boron trioxide powder and the graphene oxide-coated carbon fiber contained in a crucible, and reacting while being heat-treated such that the graphene oxide is replaced with boron nitride. The step (d) comprises placing the boron trioxide powder under a crucible and placing the graphene oxide-coated carbon fiber on the boron trioxide powder, and performing the heat treatment at 550-1000 degrees C higher than the melting point of the boron trioxide powder. The crosslinking agent containing the amine group is cadaverine and/or para-phenylenediamine.