Abstract
In order to study the effect of duty cycle during the cathodic plasma electrolytic deposition (CPED) process, Al2O3 ceramic coatings were fabricated via the CPED technique on prepared TiAl alloy in an Al(NO3)3 electrolyte with different duty cycles. Microstructure, morphology, and chemical compositions of coatings were analyzed by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The mechanical properties, such as thickness, hardness, and binding strength, were also characterized, and heat-resistance and wear-resistance tested. The results indicated that duty cycle mainly affected the relative crystallinity of CPED coatings. As the duty cycle increased, the crystallinity of CPED coatings increased, the content of Al(OH)3 and γ-Al2O3 decreased, and the content of α-Al2O3 increased. The thickness and bonding strength both increased firstly and then decreased, while hardness increased as duty cycle increased. Heat-resistance and wear-resistance of TiAl alloy with CPED coating was highly improved compared to that of TiAl alloy substrate without CPED coating.
Highlights
Due to the advantages of low density and high specific strength, TiAl alloy could improve the thrust-weight cycle, reliability, life, and safety of the aero-engines significantly
Effect of Duty Cycle on the Cathodic plasma electrolytic deposition (CPED) Process voltage is shown shown in Figure 3, where duty cycle refers to the
When the duty cycle was fixed at 5%, the arc discharge time the outage time waswas
Summary
Due to the advantages of low density and high specific strength, TiAl alloy could improve the thrust-weight cycle, reliability, life, and safety of the aero-engines significantly. FOR PEER characterization of and CPED coatingofand is no report studying the effect duty cycle on the microstructure properties thethere coatings [8,13]. 3 ) ethanol effect of duty cycle on the microstructure and properties of CPED coatings. The primary objective of microstructure this paper is to study effect of duty cycle on Al. 2O3the coatings of duty cycle of power supply on the and the properties of coatings, and influence. The primary objective of this paper is to study the effect of duty cycle on Al2O3 coatings fabricated on. 3) ethanol electrolytes during the CPED process, the influence of duty cycle of power supply on the microstructure and properties of coatings, and the influence. This research has been undertaken to enhance our understanding of the CPED technique and to enlarge the scope of its application
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