| WANG Qi-chao,DU Nan,WANG Shuai-xing,ZHAO Qing.Preparation and Tribological Property of TiO2/W Composite Coating on Ti6Al4V by Micro-arc Oxidation[J],48(1):191-199 |
| Preparation and Tribological Property of TiO2/W Composite Coating on Ti6Al4V by Micro-arc Oxidation |
| Received:May 28, 2018 Revised:January 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.01.025 |
| KeyWord:Ti6Al4V micro-arc oxidation tungsten nano-powder tribological properties micro-morphology |
| Author | Institution |
| WANG Qi-chao |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| DU Nan |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| WANG Shuai-xing |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| ZHAO Qing |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
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| Abstract: |
| The work aims to improve the tribological properties of Ti6Al4V alloy. Oxidation ceramic coatings were prepared on the surface of Ti6Al4V substrate by micro-arc oxidation treatment in silicate-phosphate electrolyte with different concentrations of tungsten nano-powder. Micro-morphology of surface and cross section element distribution, phase constituents of the micro-arc oxidation coatings with different concentrations of tungsten nano-powder were analyzed by FE-SEM, EDS and XRD. Tribological properties were evaluated by rotational wear test. The addition of tungsten nano-powder in electrolyte could promote the growth of the coating, especially the approximate linear growth within the range of 0.5~2 g/L tungsten nano-powder in electrolyte, but the adhesion of tungsten nano-powder on the surface of the coating could increase roughness. Except rutile, anatase and Al2TiO5 in the micro-arc oxidation coatings, the content of tungsten nano-powder also increased as the particles in the electrolyte grew. The friction co-efficiency and specific wear rate of the composite coating prepared in the electrolyte with 6 g/L tungsten nano-powder reduced by 13.33% and 3.53% respectively. Tungsten nano-powder exists on composite coating surface by mechanical entrapment. Parts of particles enter the membrane with molten oxide and show signs of melting. The quality of the micro-arc oxidation coating surface prepared in electrolyte with 6 g/L tungsten nano-powder is improved, e. g. reduction of the micro-pores and cracks, and better wear resistance. Friction co-efficiency and specific wear rate are both lower than that of coating without tungsten nano-powder. |
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