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,2019,48(12):3883~3888.[Shaoqing Wang,Xiangqing Wu,Lianyang Chen,Kai Zhou,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.]
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
投稿时间:2018-09-19  修订日期:2018-10-08
中文关键词:  阴极微弧沉积  TiAl合金  微观组织结构演化  晶体结构
基金项目:陕西省科技计划发展项目(项目号2018JZ5004)
中文摘要:
      目的:利用阴极微弧沉积技术在预处理后的TiAl合金表面制备了Al<sub>2</sub>O<sub>3</sub>陶瓷涂层,研究了涂层的生长过程和相组成。方法:采用电子扫描电镜(SEM、EDS)、电子透射电镜(TEM)、X射线衍射(XRD)等方法,对Al<sub>2</sub>O<sub>3</sub>涂层的生长过程中的微观形貌、组织成分以及晶体结构的演变进行了研究与分析。结果:TiAl合金表面阴极微弧沉积过程中,在阴极表面发生非晶态Al(OH)<sub>3</sub>的吸附、脱水烧结形成Al<sub>2</sub>O<sub>3</sub>陶瓷涂层的沉积。结论:Al<sub>2</sub>O<sub>3</sub>涂层生长分前期Ⅰ、中期Ⅱ和后期Ⅲ三个阶段,前期起弧阻挡层被击穿,涂层生长较慢、组织致密且与基体结合良好;反应中期涂层生长较快,Al(OH)<sub>3</sub>不断吸附和脱水烧结,涂层结晶度提高;反应后期涂层生长速度变缓,表层组织疏松、多孔,相组成为87.5 %的α–Al<sub>2</sub>O<sub>3</sub>和12.5 %的γ–Al<sub>2</sub>O<sub>3</sub>。
Microstructure Evolution of Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Ceramics Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition
英文关键词:Cathodic plasma electrolytic deposition  TiAl alloy  Microstructure Evolution  Crystallinity
英文摘要:
      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.
作者单位E-mail
王少青 西北工业大学 wsq1209@mail.nwpu.edu.cn 
吴向清 西北工业大学  
陈连阳 西北工业大学  
周恺 西北工业大学  
谢发勤 西北工业大学  
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