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王少青,吴向清,陈连阳,周恺,谢发勤.TiAl合金表面阴极微弧沉积Al<sub>2</sub>O<sub>3</sub>陶瓷涂层的生长过程与相组成[J].稀有金属材料与工程(英文),2019,48(12):3883~3888.[Shaoqing Wang,Xiangqing Wu,Lianyang Chen,Kai Zhou and Faqin Xie.Microstructure Evolution of Al<sub>2</sub>O<sub>3</sub> Ceramics Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition[J].Rare Metal Materials and Engineering,2019,48(12):3883~3888.]
Microstructure Evolution of Al<sub>2</sub>O<sub>3</sub> Ceramics Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition
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Received:September 19, 2018  Revised:October 08, 2018
DOI:
Key words: Cathodic plasma electrolytic deposition  TiAl alloy  Microstructure Evolution  Crystallinity
Foundation item:陕西省科技计划发展项目(项目号2018JZ5004)
Author NameAffiliation
Shaoqing Wang,Xiangqing Wu,Lianyang Chen,Kai Zhou and Faqin Xie  
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Abstract:
      In order to study the microstructure evolution of Al2O3 ceramics coatings during cathodic plasma electrolytic deposition (CPED) process, Al2O3 coatings were fabricated via CPED technique on prepared TiAl alloy in Al(NO3)3 electrolyte with different time. Microstructure, morphology and chemical compositions of coatings were analyzed by scanning electron microscopy (SEM) with energy–dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X–ray diffraction (XRD), and heat–resistance of TiAl alloy substrate and CPED coating were tested. The results indicated that the growth process was divided into three stages, the initial stage, the medium stage and the late stage. The barrier layer was broken down and the coating grew slower in the initial stage, and with uniform and good combination with the substrate. The CPED coating grew stable and more rapid in the medium stage, and the crystallinity of the CPED coating was improved. In the late stage, contained 87.5 % α–Al2O3, the main phase and 12.5 % γ–Al2O3, the CPED coating grew slower, and the loose and porous outer coating was fabricated.