The Synthesis And Properties Of Carbon Nanotube Embedded In Copper Composites Particles

Carbon nanotubes(CNTs) is an ideal reinforcement additive for composites because of its inimitable structure and outstanding properties.Due to their unique structure and exellent properties,CNTs is an ideal reinforcement addictive for metal matrix composite.However, because of their strong Van der Waals'forces,CNTs can not be dispersed uniformly in matrix,and the interfacial adhesion is poor, which limits their application. Therefore, it is of huge significance to blaze a novel compounding way. In this paper, choosing copper and its oxides as matrix,on the basis of modification of CNTs,using synthesis method of nanocomposites for reference,introducing composite technology of molecule level, CNTs and matrix were compounded effectively, and then the microstructure, catalysis,mechanical and thermophysics properties of composites were investigated, the correlative compounding mechanism was analysed.Firstly, abundant active groups were introduced onto the surface of purified CNTs by gelatin precoating, on the basis of this,cuprous oxides/Carbon nanotubes (Cu2O/CNTs) superfine spheres were fabricated in situ by solution method,then analysis of morphology and testing of property were carried out. SEM and TEM results show that CNTs are embedded in Composite spheres uniformly;the size of compound spheres are influenced by the reaction temperature,the concentration ration of the reactant and the titration speed of sodium hydroxide.Differential scanning calorimetry(DSC)results show that the temperature of high temperature decomposition of ammonium perchlorate (AP)is further decreased when composite spheres smaller act as the catalyst;Comparing the photocatalytic effect of cuprous oxide on the p-nitrophenol with that of the compound spheres which consist of carbon nanotubes embedded in cuprous oxide,and the results show that the photocatalytic effect is greatly improved because of the carbon nanotubes embedded in cuprous oxide.Moreover, the composite mechanism was discussed,considering that fine compound result attributes to the bridge effect of gelatin between CNTs and Cu2+ which get Cu2+ absorb and deposite on the surface of CNTs.Secondly, cuprous oxides/Carbon nanotubes (Cu2O/CNTs)become Cu-based bulk composites after reduction and hot pressing, then analysis of morphology and testing of property were carried out.SEM and TEM results show that CNTs are still embedded in Composite spheres uniformly; The tribological properties were enhanced significantly. CNTs distributed in Cu matrix with a net-like structure acted as loading-bearing and load-tansferring like steel backbone,inhibiting the dislocation motion of Cu matrix during dry sliding wear process;The results of thermophysics tests show that the thermal expansion of composite is 15% of that of pure copper; while the electric conductivity decreased.In addition,the influences of different sintering temperature on the properties were also explored.Finally, hot-rolled material with better properties,transmission results show that carbon nanotubes are tightly wrapped in copper base.