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Fabrication and wear resistance of TiO2/Al2O3 coatings by mi-cro-arc oxidation
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Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing University of Aeronautics and Astronautics

Clc Number:

TG 174.453

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    Abstract:

    The TiO2/Al2O3 composite coatings were successfully prepared on the surface of Ti-6Al-4V alloy by means of micro-arc oxidation in the Na2SiO3-(NaPO3)6-NaAlO2 solution. Its growth process revealed that O2- reacted rapidly with Ti4 (from substrate) along the reaction channels to form TiO2, and because of the addition of AlO2-, Al2O3 and Al2TiO5 were simultaneously formed. Al2TiO5 was immediately decomposed into rutile TiO2 and α-Al2O3 owing to the high thermal energy caused by discharge. Finally the prepared composite phase coatings were mainly composed of anatase TiO2, rutile TiO2 and α-Al2O3 via XRD analysis. Furthermore, the wear resistance of the TiO2/Al2O3 composite coatings enhanced about 9.5 times than that of Ti-6Al-4V alloy owing to the existence of ceramic layer.

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[Shen Yizhou, Tao Haijun, Lin Yuebin, Zeng Xiaofei, Wang Tao, Tao Jie, PAN Lei. Fabrication and wear resistance of TiO2/Al2O3 coatings by mi-cro-arc oxidation[J]. Rare Metal Materials and Engineering,2017,46(1):23~27.]
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History
  • Received:September 18,2014
  • Revised:January 03,2015
  • Adopted:January 13,2015
  • Online: March 16,2017

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