Influence of Voltage on Microstructure of Micro-Arc Oxide Films on TC4 Titanium Alloy

Abstract

The porous ceramic biologic films were prepared on the surface of Ti6Al4V (TC4) with micro-arc oxidation technology (MAO). The phase composition, microstructure and cross section morphology, surface elements composition and valence state of micro-arc oxide films were studied. Results show that with increasing of the micro-arc oxidation voltage, the better biocompatible hydroxyapatite appears on the surface of titanium alloy (TC4). The high voltage promotes the surface pore size enlarge.

Effect of rare earth elements on plasma electrolytic carbonitriding of Ti–6Al–4V alloy

“…Because during the growth of the strengthening layer, the surface of the titanium alloy is continuously melted and cooled by the action of the pulse discharge, and some of the pores are melted again before being completely covered by the melt. This process is similar to the formation of a micro-arc oxide film and eventually a loose porous structure will be generated at the boundary [32]. The uniformity of the coating produced without the addition of RE is poor and the thickness is only about 3.8 μm.…”