氧化石墨烯调控GO/TiO_(2)陶瓷膜层自封孔效应研究

Study on Self-Sealing Pore Effect of GO/TiO_(2) Coating Controlled by Graphene Oxide

自封孔是调控微弧氧化膜层孔结构,改善膜层耐磨性和耐蚀性等性能的重要技术之一。针对物理封孔稳定性差和封孔剂膨胀作用对膜层结构的显著影响,本实验利用氧化石墨烯自身的导电特性,制备具有减摩效应的GO/TiO_(2)微弧氧化自封孔陶瓷膜层,研究了氧化石墨烯浓度对微弧氧化陶瓷膜层孔结构和减摩性能的影响。研究发现,通过添加氧化石墨烯,可以改变电解液电化学平衡过程,从而实现对GO/TiO_(2)陶瓷膜层孔结构的调控。其中,氧化石墨烯浓度为5 g/L时制备出自封孔陶瓷膜层(G5),其孔隙率、孔径和平均摩擦系数分别为3.6%、2.5μm和0.1,相较于氧化石墨烯浓度为0g/L的膜层(G0)分别下降了83.2%、78.4%和87.5%。研究认为,微弧氧化陶瓷膜层表面孔结构可以通过控制氧化石墨烯浓度,进而影响胶体沉积和能量释放进行调控,这为制备具有减摩效应的自封孔微弧氧化膜层提供了新思路。

Self-sealing pore is one of the important technologies to control the pore structure,improve the antifriction and corrosion resistance of micro-arc oxidation coating.In order to solve the problem that the poorer stability of physical sealing pore and expansion of sealing agent impacted the structure of the coating,this paper used the conductivity properties of graphene oxide to prepare GO/TiO_(2) self-sealing pore ceramic coatings with antifriction effect.The effect of graphene oxide concentration on pore structure and antifriction of ceramic coating was discussed.It is found that the electrochemical balance process of electrolyte is changed by adding graphene oxide,which contributes to controlling the pore structure of the GO/TiO_(2) coating.When graphene oxide concentration is 5 g/L,the porosity,pore size and average friction coefficient of the self-sealing pore ceramic coating(G5)are 3.6%,2.5μm and 0.1,which decrease by 83.2%,78.4%and 87.5%,respectively,compared with the G0 coating.It is believed that the pore structure of micro-arc oxidation coating can be controlled through controlling graphene oxide concentration,which can affect the colloidal deposition and energy release.This provides a new idea for the preparation of antifriction self-sealing pore coating.