Favorable deposition of γ-Al 2 O 3 coatings by cathode plasma electrolysis for high-temperature application of Ti-45Al-8.5Nb alloys
2017; Elsevier BV; Volume: 333; Linguagem: Inglês
10.1016/j.surfcoat.2017.11.005
ISSN1879-3347
AutoresZhipeng Jiang, Xu Yang, Yongfeng Liang, Guojian Hao, Hui Zhang, Junpin Lin,
Tópico(s)High-Temperature Coating Behaviors
ResumoCathode plasma electrolysis deposition (CPED) has been used to prepare γ-Al2O3 coatings on Ti-45Al-8.5Nb alloys for high-temperature application. The effect of deposition voltage and duty cycle on microstructure and high-temperature oxidation resistance of the coatings has been studied. The surface and cross-section morphologies before and after high-temperature oxidation test, chemical composition and phase identification of the coatings have been investigated by scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and X-ray diffraction (XRD). The results show that the thickness and high-temperature oxidation kinetics of as-prepared Al2O3 coatings initially increase and then decrease, with the increase of deposition voltage from 110 V to 150 V and duty cycle from 40% to 80%. The minimum weight gain of only 0.495 mg/cm2 after oxidation duration of 100 h at 900 °C can be achieved for the coatings formed with deposition voltage of 130 V and duty cycle of 60%. The deposition mechanism of the coatings and effect of CPED parameters are also explained in this work.
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