STUDY ON FABRICATION OF Al₂O₃ COATED CF/Al BY USING SOL GEL TECHNIQUE

Al₂O₃ sol gel was obtained by hydrolysis and polycondensation of chemically modified isopropoxyaluminum Al(OPr) 3 with acetylacetone (AcAcH), performed in the propanol solution with stoichiometric solution of isopropoxyaluninum, and then chemically converted by drying and pyrolysis to form γ-Al₂O₃ coating on carbon fibers. Further study focused on making the (coated) fiber reinforced aluminum composite prefabrication. The aluminum gel, the coated carbon fiber and the prefabrication were characterized by IR, TG DTA, XRD, SEM, etc . The results show that γ-Al₂O₃ coating prevents the harmful reaction between C/Al and penetration of oxygen molecule effectively. After the coating treatment, oxidation resistance of carbon fibers is enhanced, the moistability between the fibers and melting aluminum is greatly improved, and the tensile strength of C/Al prefabrication is heightened.