Abstract
Surface oxidation of titanium and its alloy allow to obtain oxide coatings with very good adhesion, that makes them very attractive in many industry applictions.TC4 titanium alloy was surface treated by laser oxidation for improving wear resistance and the surface hardness. While the wear behaviour of laser oxidized TC4 is reported elsewhere, the present study aims at characterizing the oxide film formed in laser oxidation by means of scanning electron microscope (SEM), microhardness tester and energy dispersive X-ray analysis (EDX). The laser formed (LF) oxide film on TC4 polished substrate is studied in the present work. The LF oxide film on TC4 has a thickness of about 3 µm. EDX analysis shows a surface O/N atomic ratio of 17.61∼6.93 for laser oxidized samples. Composition by EDX reveals that the LF oxide film contains mainly titanium oxides, together with some amount of N in oxidized and metallic states. The surface oxygen can be amounted to 57.14Wt% or 35.86Wt% under different treated processing parameters. These findings show clearly that laser oxidation significantly changes the characteristics of the oxide film on TC4 and also provide an explanation for the improvement in surface properties due to laser oxidation.Surface oxidation of titanium and its alloy allow to obtain oxide coatings with very good adhesion, that makes them very attractive in many industry applictions.TC4 titanium alloy was surface treated by laser oxidation for improving wear resistance and the surface hardness. While the wear behaviour of laser oxidized TC4 is reported elsewhere, the present study aims at characterizing the oxide film formed in laser oxidation by means of scanning electron microscope (SEM), microhardness tester and energy dispersive X-ray analysis (EDX). The laser formed (LF) oxide film on TC4 polished substrate is studied in the present work. The LF oxide film on TC4 has a thickness of about 3 µm. EDX analysis shows a surface O/N atomic ratio of 17.61∼6.93 for laser oxidized samples. Composition by EDX reveals that the LF oxide film contains mainly titanium oxides, together with some amount of N in oxidized and metallic states. The surface oxygen can be amounted to 57.14Wt% or 35.86Wt% under different treated processing para...
Published Version
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