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李洪,宋智辉.Ti6Al4V钛合金表面Al2O3颗粒改性微弧氧化涂层制备及性能[J].稀有金属材料与工程(英文),2020,49(3):755~760.[Li Hong and Song Zhihui.Preparation and property of a modified micro-arc oxidation coating using Al2O3 particles on Ti6Al4V[J].Rare Metal Materials and Engineering,2020,49(3):755~760.]
Preparation and property of a modified micro-arc oxidation coating using Al2O3 particles on Ti6Al4V
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Received:October 26, 2018  Revised:October 31, 2018
DOI:
Key words: Ti6Al4V  micro-arc oxidation  Al2O3 particle  oxidation resistance  thermal shock property
Foundation item:2017广东省科学院科技创新发展专项(2017GDASCX-0844,2017GDASCX-0111),2017广东省科学院院士基金(2017GDASCX-0202)
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Li Hong and Song Zhihui  
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Abstract:
      Micro-arc oxidation is a new surface treatment method, but the structure of the micro-arc oxidation coating is limited to the electrolyte composition. In this paper the micro-arc oxidation coating on Ti6Al4V alloy was modified by addition of micro- Al2O3 particles to a sodium phosphate solution. The coating structure and phase was characterized by scanning electron microscopy and X-ray diffraction, and the oxidation resistance and thermal shock properties of the coating were investigated. Results showed that a coating denser than the original coating was produced. This new coating was composed of Al2TiO5 and TiO2. The oxidation resistance and thermal shock property of the coating improved with addition of Al2O3 particles to the electrolyte relative to the sample prepared without the particles in the electrolyte. Moving Al2O3 particles were adsorbed on the coating surface and penetrated through it. As a result, the phase structure and properties of the original coating were modified.