| LIU Wan-ying,QIU Yu-hong,LIU Ying,LIN Yuan-hua,SHI Yun-sheng,Mohd Talha,GAO Ting-yan.Effect and Mechanism of Nano-TiO2 on Wear Resistance of Micro-arc Oxidation Film on D16T Aluminium Alloy[J],48(10):180-189 |
| Effect and Mechanism of Nano-TiO2 on Wear Resistance of Micro-arc Oxidation Film on D16T Aluminium Alloy |
| Received:March 22, 2019 Revised:October 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.022 |
| KeyWord:nano TiO2 micro-arc oxidation D16T Al alloy friction coefficient micro-hardness wear resistance |
| Author | Institution |
| LIU Wan-ying |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China; 2.School of Materials Science and Engineering, Sichuan University, Chengdu , China |
| QIU Yu-hong |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| LIU Ying |
2.School of Materials Science and Engineering, Sichuan University, Chengdu , China |
| LIN Yuan-hua |
1.a.School of Materials Science and Engineering, b. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| SHI Yun-sheng |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| Mohd Talha |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| GAO Ting-yan |
1.a.School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| The work aims to improve the wear resistance of D16T aluminum alloy. A micro-arc oxidation ceramic coating was produced on the surface of D16T aluminum alloy with the micro-arc oxidation technique by adding 2 g/L nano-TiO2 additive to the mixed electrolyte system of silicate and phosphate. The effect and mechanism of nano-TiO2 additive on the structure and wear resistance of the coatings formed on D16T aluminum alloy were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy spectrum analyzer (EDS), microhardness tester, thickness tester and friction and wear tester. The surface of micro-arc oxide coating became more smooth and denser and had fewer micropores and cracks due to nano-TiO2, thus greatly improving the coating structure. Compared to the micro-arc oxidation coating prepared in the electrolyte without nano-TiO2, the new phase TiO2 was formed in the micro-arc oxidation coating prepared in the electrolyte containing nano-TiO2, and more α-Al2O3 and γ-Al2O3 phases were formed. Therefore, the thickness of the coating with nano-TiO2 was obviously increased and up to 31.2 μm, and the microhardness was also significantly improved to 510HV. The friction coefficient of D16T micro-arc oxidation coating was reduced and the average friction coefficient was 0.45 which was smaller than 0.75 of the coating without nano-TiO2. The nano-TiO2 added to the electrolyte has entered the formed oxidation coating during micro-arc oxidation reaction and filled the micropores and cracks in the coating. Therefore, the coating structure is improved and the coating thickness is increased, which significantly improves the microhardness and wear resistance of micro-arc oxidation coating. |
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