| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1603649 | International Journal of Refractory Metals and Hard Materials | 2013 | 6 Pages |
The oxidation behavior of nano-sized Al2O3–TiC–Co composite sintered at different temperature was investigated at 200–1000 °C in air for 25 h. Microstructures and phase compositions of oxidation surfaces were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results indicated that the oxidation reaction would take place when oxidation temperatures are 800 °C and 1000 °C. The oxidation resistance of Al2O3–TiC–Co composite increased with the sintering temperature rising when the sample was oxidized at 800 °C and 1000 °C. The mechanism of oxidation has been analyzed using thermodynamic and kinetics considerations. The oxidation kinetics follows a rate that is faster than the parabolic rate law at 800 °C and 1000 °C. The activation energy of the composite for oxidation in the range of 800 °C to 1000 °C was found to be 142.21 kJ/mol.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The oxidation behavior of Al2O3–TiC–Co composites is studied from 200 to 1000 °C. ► The oxidation resistance of composites increased with sintering temperature increasing. ► The oxidation kinetics of the composites did not follow the parabolic-rate law. ► The rate is slightly faster than the parabolic-rate law at 800–1000 °C. ► The rate constant k decreased with sintering temperature going up at 800 °C–1000 °C.
