Influences of Different Calcination Ambiences on Phase Composition, Morphologies of Ceramic Coatings on Ti–6Al–4V Alloy by Micro-Arc Oxidation

Guo Dong Hao; Huan Yuan; Jing Zhang

doi:10.4028/www.scientific.net/AMR.412.469

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Influences of Different Calcination Ambiences on Phase Composition, Morphologies of Ceramic Coatings on Ti–6Al–4V Alloy by Micro-Arc Oxidation

Abstract:

Compound ceramic coatings with the main crystal phase of Al₂TiO₅(as-coated samples) were prepared in situ on the surface of Ti-6Al-4V alloy by means of pulsed bi-polar micro-arc oxidation (MAO) in an NaAlO₂solution. The coated samples were calcined in argon and air at 1000°C, respectively. The phase composition, surface and section morphology, and element contents of the ceramic coatings were investigated by X-ray diffractometry (XRD), Scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy (XRF). The samples were treated in argon and the as-coated ones were calcined in air at 1000°C to study the anti-oxidation properties of the samples. The results show that Al₂TiO₅ had been decomposed in an hour and transformed into α-Al₂O₃ and rutile TiO₂ in air. However, Al₂TiO₅ had been decomposed in four hours in argon and the final coating surface was completely composed of α-Al₂O₃. The content of Al₂O₃was decreased from outside to inside layers and Ti₂O₃was formed in the coating. Furthermore, the morphology of the ceramic coatings after the calcination was different. The coatings calcined in argon were finer; the grains and pores were smaller than those in air.