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Journal of Chinese Society for Corrosion and protection  2019, Vol. 39 Issue (6): 469-476    DOI: 10.11902/1005.4537.2018.173
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Preparation and Properties of Alumina Ceramic Film on Ti-alloy Surface
JIANG Dongxue1,2,FU Ying3,ZHANG Junwei1(),ZHANG Wei2,4(),XIN Li2,ZHU Shenglong2,WANG Fuhui5
1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
2. Shenyang Materials Science National Research Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Dalian Huarui Heavy Industry Crane Co. Ltd. , Dalian 116052, China
4. Fujian Longxi Bearing (Group) Corporation Limited, Zhangzhou 363000, China
5. Shenyang National Laboratory for Materials Science, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
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Abstract  

The application of Ti-alloys is restricted to its low hardness and poor wear resistance. In this paper, a pure Al-fim of 40 μm in thickness was deposited on the surface of TC4 Ti-alloy by multi-arc ion plating, and then micro-arc oxidation (MAO) in constant current mode was carried out to obtain wear-resistant ceramic films. The microstructure, microhardness, wear resistance and bonding strength of MAO films were characterized by mean of SEM, XRD, micro hardness tester etc. The results show that the ceramic film is mainly composed of γ-Al2O3, α-Al2O3 and a small amount of amorphous SiO2, and the film is uniform and compact. With the increase of the MAO time, the thickness of alumina ceramic film increases. The hardness of the dense portion of MAO coating is 1261 HV after micro-arc oxidation for 3 h. For the case of micro-arc oxidation for 4 h, the thickness of the generated alumina ceramic film is 60~70 μm, while almost the entire pre-deposited Al-film is oxidized, and the substrate Ti-alloy is slightly oxidized. At the same time, some penetration cracks in the oxide film was found, therefore, the hardness of the film and the bonding strength between the film and substrate all decrease. The friction coefficient of MAO ceramic film is lower than that of Ti-alloy substrate, and the wear rate is also obviously reduced. In sum, the bonding strength of MAO ceramic films with the substrate is higher than 40 MPa, whereas, the maximum bonding strength can reach 68 MPa.

Key words:  Ti-alloy      multi-arc ion plating      micro-arc oxidation      microstructure      wear resistance      adhesive strength     
Received:  23 November 2018     
ZTFLH:  TG174.45  
Fund: Supported by National Natural Science Foundation of China(U1537107);Supported by National Natural Science Foundation of China(51871229);Postgraduate Education Reform and Innovation Project of University of Science and Technology Liaoning(2017YJSCX08);Liaoning Key Project of the 13th Five-Year Plan for Education Science(JG18DA008);STS Program Supporting Project(2016T3030)
Corresponding Authors:  Junwei ZHANG,Wei ZHANG     E-mail:  ustlzjw@163.com;weizhang@imr.ac.cn

Cite this article: 

JIANG Dongxue,FU Ying,ZHANG Junwei,ZHANG Wei,XIN Li,ZHU Shenglong,WANG Fuhui. Preparation and Properties of Alumina Ceramic Film on Ti-alloy Surface. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 469-476.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2018.173     OR     https://www.jcscp.org/EN/Y2019/V39/I6/469

Fig.1  Surface morphologies of the oxide films formed on TC4 alloy with aluminum overlayer after MAO for 2 h (a), 3 h (b) and 4 h (c)
Fig.2  Cross-section morphologies of the oxide films formed on TC4 alloy with aluminum overlayer after MAO for 2 h (a), 3 h (b) and 4 h (c)
Fig.3  EDS results of element compositions in the cross section of the oxide film formed on TC4 alloy with aluminum overlayer after MAO for 4 h
Fig.4  XRD patterns of the MAO film formed on TC4 alloy with aluminum overlayer before (a) and after (b) removing of loose outer layer
PointMAO for 2 hMAO for 3 hMAO for 4 h
Loose layerDense layerLoose layerDense layerLoose layerDense layer
176911195861151389982
258611686491431295846
351612334611277449805
475610964711248525945
560210097491194300832
Average value64611255831261392886
Table 1  Hardness values of the loose and dense layers of MAO films on TC4 alloy with aluminum overlayer (HV)
Fig.5  Friction coefficient curves of TC4 alloy without and with MAO films
SampleFilm thickness / μmTime / minFriction coefficientWear volume / mm3Wear rate / mm3·N-1·m-1
TC40300.824.603×10-12.572×10-4
MAO for 2 h40~50300.621.107×10-36.150×10-6
MAO for 3 h50~60300.633.375×10-31.875×10-5
MAO for 4 h60~70300.718.936×10-34.964×10-5
Table 2  Friction coefficients and wear resistances of TC4 alloy without and with MAO films
Fig.6  Morphologies of surfaces (a, c, e, g) and cross sections (b, d, f, h) of TC4 (a, b), MAO for 2 h (c, d), MAO for 3 h (e, f) and MAO for 4 h (g, h) alloy samples after wear test
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