氧化石墨烯调控GO/TiO2陶瓷膜层自封孔效应研究

Study on the self-sealing pore effect of graphene-oxide on GO/TiO2 coating

摘要:

自封孔是提高微弧氧化膜层耐磨性和耐蚀性等综合性能的重要技术之一。针对物理封孔因封孔剂稳定性和膨胀作用限制膜层服役安全性等问题,本论文利用氧化石墨烯电性调控微弧氧化陶瓷膜层孔结构,制备具有减摩效应的GO/TiO₂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的影响。研究发现,通过氧化石墨烯改变电解液导电性等参数影响反应过程,从而实现对GO/TiO₂陶瓷膜层孔结的调控。氧化石墨烯浓度为5g/L时制备出了孔隙率、孔径和平均摩擦系数分别为3.6%、2.5μm和0.1的自封孔陶瓷膜层,相较于传统微弧氧化膜层分别下降了83.2%、78.4%和87.5%。研究认为通过控制氧化石墨烯浓度可以实现对微弧氧化陶瓷膜层表面孔结构的调控,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。

Abstract:

Self-sealing pore is one of the important technologies to improve the antifriction and corrosion resistance of micro-arc oxidation coating. In order to solve the problem that the stability and expansion effect of sealing agent of physical sealing pore coating limited the service time. This paper uses the electrical property of graphene oxide to control the pore structure of ceramic coatings and to prepare GO/TiO₂ self-sealing pore ceramic coatings with antifriction effect. The effect of graphene oxide concentration on pore structure and antifriction of ceramic coating were discussed. The result show that the conductivity of electrolyte was changed by graphene oxide to affect the reaction process, which contributed to control the pore structure of the GO/TiO₂ coating. The self-sealing pore coating with the porosity, pore size and average friction coefficient of 3.6%, 2.5μm and 0.1 was prepared at the graphene oxide concentration of 5g/L, which decreased by 83.2%,78.4% and 87.5% respectively compared with traditional coatings. It is believed that the pore structure of micro-arc oxidation coating can be controlled by the concentration of graphene oxide, which provides a new idea for the preparation of antifriction self-sealing pore coating.