Tribological Performance Of TiO₂ And Cu₂S Films Prepared By Liquid Phase Method

As important inorganic functional materials, nanometer Ti O2 and Cu2 S which has stable chemical properties, excellent photoelectric properties, efficient photocatalytic and light induced hydrophilic properties, has attracted widespread attention. However, their tribological performance is not well studied. In this paper, several liquid phase methods are used to fabricate Ti O2 and Cu2 S films on glass, copper and stainless steel. Their surface morphology, crystal structure, hydrophobicity, tribological performance and corrosion resistance were characterized by using scanning electron microscope(SEM), X-ray diffraction(XRD), atomic force microscope(AFM), profilograph, electrochemical workstation, friction and wear tester. The results are as following:(1)Vanadium(V) doped Ti O2 thin film were fabricated on the surface of glass by using the sol-gel method. It is found that the doped Ti O2 thin films show better friction-reducing and wear protection performance than undoped Ti O2 thin film. The most striking case is found for 5% V doped Ti O2 thin film. The highest contact angle and smallest surface energy minimum and best friction and wear performance are observed.(2)Ti O2 thin film on copper surface were prepared on copper surface by using the sol-gel method with hydrothermal treatment. The Ti O2 thin film prepared shows the compact structure without micro cracks due to different thermal expansion coefficient of Ti O2 thin film with copper. The existence of Ti4O7 phase was also observed in Ti O2 thin film. As comparing with the air-heated Ti O2 thin film, hydrothermally treated Ti O2 thin film shows lower friction coefficient and longer wear life. At the same time, it shows better corrosion resistance in 3.5% Na Cl solution.(3)The Ti O2 thin film was created on surface of 304 stainless steel by using liquid phase deposition method and its tribological performance in dry sliding and lubricated by DI water and 3.5% Na Cl solution were conducted. It is found that Ti O2 thin films possess anti-friction wear-resisting performance.(4)Cu2S film with micro/nano structure was created on copper by using a hydrothermal method. The effect of the amount of the hexadecyltrimethylammonium bromide(CTAB) on surface structure of Cu2 S film is evaluated. It is found that Cu2 S films shows reduced contact angle with increasing the amount of CTAB. In the same time, the films show increasing surface energy and poorer wear-resisting and anti-friction performance. The best case is found for Cu2 S film when molar ratio of S to CTAB is at 1:1.