| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1470428 | Corrosion Science | 2010 | 7 Pages |
The oxidation behaviour of Ti2AlC bulk and high velocity oxy-fuel spray deposited coatings has been investigated for temperatures up to 1200 °C. X-ray diffraction and electron microscopy show that bulk Ti2AlC forms a continuous layer of α-Al2O3 below a layer of TiO2 at temperatures as low as 700 °C. Oxidation of the Ti2AlC coatings is more complex, and also involves the phases Ti3AlC2, TiC, and TixAly, formed during the spraying process. α-Al2O3 is observed, however, it is unevenly distributed deep into the material, and does not form a continuous layer essential for good oxidation resistance.
Research highlights► Oxidation of bulk Ti2AlC and spray deposited Ti2AlC coatings in the temperature range 700–1200 °C has been studied. ► It has been shown that bulk Ti2AlC forms a protective layer of α-Al2O3 already at 700 °C but this good oxidation properties for bulk are not easy to transfer to the coatings. ► The protective layer of aluminium oxide does not form on the coatings due to the presence of TiC and TixAly. ► It is concluded that in order to transfer the good oxidation properties of bulk Ti2AlC into coatings, the fabrication process should be adjusted to produce coatings with more and larger Ti2AlC grains and less oxygen in the as-deposited state.
