Fabrication and Wear Resistance of TiO2/Al2O3 Coatings by Micro-arc Oxidation

被引:6
|
作者
Shen Yizhou [1 ]
Tao Haijun [1 ]
Lin Yuebin [1 ,2 ]
Zeng Xiaofei [1 ]
Wang Tao [1 ]
Tao Jie [1 ]
Pan Lei [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Nanjing 211100, Jiangsu, Peoples R China
[2] Jiangsu Prov Key Lab Intervent Med Devices, Huaian 223003, Peoples R China
基金
中国国家自然科学基金;
关键词
Ti-6Al-4V; oxidation; TiO2/Al2O3; wear; CORROSION-RESISTANCE; CERAMIC COATINGS; MAGNESIUM ALLOYS; MICROSTRUCTURE; GROWTH; NANOPOWDERS; SUBSTRATE; TITANIUM;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
TiO2/Al2O3 composite coatings were prepared on the surface of Ti-6Al-4V alloy by micro-arc oxidation in the Na2SiO3-(NaPO3)6-NaAlO2 solution. The growth process reveals that O2- reacts rapidly with Ti4+ (from substrate) along the reaction channels to form TiO2, and because of the addition of AlO2-, Al2O3 and Al2TiO5 are simultaneously formed. Al2TiO5 is immediately decomposed into rutile TiO2 and alpha-Al2O3 owing to the high thermal energy caused by discharge. Finally the prepared composite phase coatings are mainly composed of anatase TiO2, rutile TiO2 and alpha-Al2O3 via XRD analysis. Furthermore, the microhardness HV increases and maintains at about 11 000 MPa, and the wear resistance of the TiO2/Al2O3 composite coatings is enhanced by about 9.5 times than higher that of Ti-6Al-4V alloy owing to the existence of ceramic layer.
引用
收藏
页码:23 / 27
页数:5
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