| QI Yu-ming,PENG Zhen-jun,LIU Bai-xing,LIANG Jun,WANG Peng.Fabrication and Wear Resistance of Hard Micro Arc Oxidation Coatings on Ti Alloys[J],48(7):81-88 |
| Fabrication and Wear Resistance of Hard Micro Arc Oxidation Coatings on Ti Alloys |
| Received:December 26, 2018 Revised:July 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.07.008 |
| KeyWord:Ti alloys micro arc oxidation high hardness wear resistance high concentration aluminate |
| Author | Institution |
| QI Yu-ming |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China; 2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing , China |
| PENG Zhen-jun |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LIU Bai-xing |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| LIANG Jun |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| WANG Peng |
1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| The work aims to fabricate MAO coatings with high hardness and wear resistance on Ti alloy and study the friction and wear properties. MAO coatings were prepared on Ti alloy with aluminate electrolyte in higher concentration. The mi-crostructure and composition of the coatings were characterized by Scanning Electron Microscope (SEM), X-ray Energy Dis-persive Spectrometer (EDS) and X-ray Diffraction Spectrometer (XRD). The cross-sectional elements distribution was investigated via Glow Discharge Spectrometer (GDOES). The micro-hardness and wear resistance were measured with Vicker shardness tester and friction tester, respectively. The wear scars were analyzed with 3D surface profiler. The coatings were mainly composed of Al2TiO5 and γ-Al2O3 phases, with a little of rutile TiO2. As the aluminate concentration increased, the coatings exhibited more uniform surface morphologies and elements distribution, and less internal pores and micro-cracks. The hardness of the coatings was increased with the increase of the aluminate concentration, and the maximum hardness was up to ~1140HV, which was significantly higher than that of the Ti6Al4V substrate. The friction coefficients of the coatings were between 0.55 and 0.65 in stable friction stage. As the aluminate concentration increased, the wear scar depth reduced and the wear rate decreased. MAO coatings prepared in relative higher concentrated aluminate electrolyte has higher hardness and shows excellent wear resistance under the dry sliding condition. |
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