Preparation of TiO2/(PTFE+Graphite) Micro-arc Oxidation Composite Coatings by Two-step Method and Their Tribological Behavior

CHEN Xiao-wen; JIANG Xuan; ZHANG De-fen; ZHAO Peng-fei; CHEN Xiao-ping; LIAO Dan-dan; SHI Tai-he

doi:10.16490/j.cnki.issn.1001-3660.2018.10.017

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Surface Technology ›› 2018, Vol. 47 ›› Issue (10) : 131-138. DOI: 10.16490/j.cnki.issn.1001-3660.2018.10.017

Preparation of TiO2/(PTFE+Graphite) Micro-arc Oxidation Composite Coatings by Two-step Method and Their Tribological Behavior

CHEN Xiao-wen¹, JIANG Xuan², ZHANG De-fen², ZHAO Peng-fei², CHEN Xiao-ping², LIAO Dan-dan², SHI Tai-he³

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Abstract

The work aims to improve the abrasion resistance of titanium alloy drill pipe.The micro-arc oxidation treatment was performed on the surface of the titanium alloy drill pipe, and then the micro-arc oxidation coating was subjected to (PTFE + graphite) composite treatment to obtain a (PTFE + graphite) composite coating. The surface morphology of the TiO2/(PTFE+ graphite) composite coating was observed by scanning electron microscopy (SEM). The content of the coating elements was an-alyzed by energy dispersive spe-ctroscopy (EDS). The phase composition of the composite coating was analyzed by X-ray dif-fraction (XRD). The friction and wear properties of the coating weretested by multi-functional friction and wear tester, and the three-dimensional morphology of wear scars on the micro-arc oxidation layerafter abrasion was observed by a three- di-mensional microscope (whitelight interferometer). PTFE and graphite entered the micropores of the micro-arc oxidation layer and formed a thin layer of PTFE and graphite composite coating on the surface. The coating wasmainly composed of Ti, O, Si, Al, P, V, C, F and other elements, in which the content of carbon and fluorine (wt%) reached 9.96% and 25.53%, respectively. The XRD analysis showed that the TiO2/(PTFE+graphite) composite coating contained PTFE and graphite besides anatase TiO2 and rutile TiO2. The friction coefficient of TiO2/(PTFE+graphite) composite coating was 0.19, the wear scar width and depth were 210 μm and 1.5 μm, respectively, and the relative abrasion resistance was 18.73. The wear marks of the composite coating didnot have any obvious plough furrow, and thewear marks wererelatively flat. Compared with TC4 titanium alloy, the wear resistance of TiO2/(PTFE + graphite) composite coating was significantly improved. The wear of TiO2/(PTFE+graphite) composite coating wasdominated by abrasive wear, along with some adhesive wear. The treatment of titanium alloy TiO2/(PTFE + graphite) composite by two-step method can effectively improve the wear resistance of titanium alloy.

Key words

TiO2/(PTFE+graphite) composite coating; titanium alloy drill pipe; friction and wear; micro arc oxidation; two-step method; the abrasion resistance

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CHEN Xiao-wen, JIANG Xuan, ZHANG De-fen, ZHAO Peng-fei, CHEN Xiao-ping, LIAO Dan-dan, SHI Tai-he. Preparation of TiO2/(PTFE+Graphite) Micro-arc Oxidation Composite Coatings by Two-step Method and Their Tribological Behavior[J]. Surface Technology. 2018, 47(10): 131-138

Funding

Supported by the Sichuan University Students Innovation and Entrepreneurship Training Project (201710615066) and the Sichuan Provincial Key Laboratory of Oil & Gas Field Materials Projects (X151517KCL03)