Preparation Of C/C Film Interface Composite Based On Magnetron Sputtering

Carbon fiber reinforced resin matrix composites are widely used in various fields due to their excellent properties.However,the smooth surface of the carbon fiber,poor wettability,and low chemistry activity,lead to interfacial adhesion strength between the carbon fiber and the resin matrix is low,which affects the performance of the best mechanical properties,cannot fully meet the application requirements of various fields.In order to improve the interfacial adhesion strength of composites,used magnetron sputtering to modify carbon fiber by depositing carbon film.The effects of magnetron sputtering on the carbon film structure,the interface of carbon fiber reinforced composites and their mechanical properties were investigated.Firstly,a carbon film was deposited on the surface of the silicon to discuss the influence of magnetron sputtering process on the structure and properties,and the resulting carbon film was characterized by the atomic force microscope,scanning electron microscope and a measuring instrument of static contact angle.The results show that with the increase of sputtering power,the thickness and surface roughness of carbon film increase gradually,the compactness gradually improves,and the static contact angle increases first and then decreases.With the extension of sputtering time,the thickness of carbon film and The surface roughness is gradually increased,the uniformity is gradually improved in a certain sputtering time,the static contact angle is the smallest at 30 min,and the wettability is the best;as the sputtering pressure increases,the thickness of the carbon film becomes smaller and smaller,and the surface is rough.The first increase and then decrease,the compactness will deteriorate under too high sputtering pressure,and the static contact angle will decrease first and then increase.In order to further improve the structure and properties of the carbon film,the carbon film was heat treated to investigate the effect of heat treatment temperature and time on the structure and wettability.The results showed that after heat treatment,the surface of the carbon film showed a crystal structure and the roughness increased significantly.The static contact angle is reduced and the wettability is improved.At 1100�C,the roughness reaches the maximum value of 4.88 nm,and the wettability is optimal.At the same time,the heat treatment time also has a certain influence.At 30 min,the wettability is good,the static contact angle is only 44.58 �,and the surface roughness is maximum at 60 min.Finally,the carbon fiber modified by different processes was combined with epoxy resin by injection molding to prepare composite materials.The effects of magnetron sputtering and heat treatment on the structure of carbon film and mechanical properties of carbon fiber composites were analyzed.The results show that the tensile strength and bending strengthh of the composites are improved by the magnetron sputtering process.When the sputtering power is 250W,time 30min,pressure 1.0Pa,the modification effect is best,tensile strength and bending strength is 138.31 MPa,103.49 MPa,respectively,which is increased by 44.04%and 69.57%compared with that before unmodified.and the modified carbon fiber reinforced epoxy resin matrix composite material does not break instantly when stretched,instead,there is a stretching phenomenon of first buckling and post-cracking.After heat treatment,the degree of graphitization of carbon fiber increases,and the strength of D peak and G peak increases.When the heat treatment temperature is 1000? for 40 min,the tensile and flexural strengths are optimal,it was 40.61 MPa and 80.94 MPa,respectively,which was increased by 33.67%and 5.1%compared with that before heat treatment.