Polycrystalline TiAlN films were deposited on a substrate of high-speed steel via a radio-frequency-bias reactive-sputtering process. The effects of aluminum concentration (0-60 at.%) on the high-temperature oxidation behavior of TiAlN films were explored by using in situ thermogravimetric analysis and high-temperature X-ray diffractometry. The composition and distribution of the oxidizing layers over TiAlN films were investigated. Results indicated that the oxidation resistance increased as the aluminum concentration increased. The type and location of oxidizing phases also were dependent on the aluminum concentration. Three major oxides - i.e., Al2O3, TiO2, and TiO - were observed. The thickness of the Al2O3 layer increased and the TiO2 gradually changed to TiO as the aluminum content increased. Thermodynamic calculations were compared to experimental observations, and they showed good agreement.
|Number of pages||9|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1999|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry