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Oxidation behavior of micro-sized Al2O3–TiC–Co composites prepared from cobalt-coated powders |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China;2. College of Materials Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China;1. School of Material Engineering, Shaanxi Polytechnic Institute, Xianyang 712000, People’s Republic of China;2. School of Materials Science and Technology, Xi’an University of Technology, Xi’an 710048, People’s Republic of China |
| Abstract: | The oxidation behavior of hot-pressed Al2O3–TiC–Co composites prepared from cobalt-coated powders has been studied in air in the temperature range from 200 °C to 1000 °C for 25 h. The oxidation resistance of Al2O3–TiC–Co composites increases with the increase of sintering temperature at 800 °C and 1000 °C. The oxidation surfaces were studied by XRD and SEM. The oxidation kinetics of Al2O3–TiC–Co composites follows a rate that is faster than the parabolic-rate law at 800 °C and 1000 °C. The mechanism of oxidation has been analyzed using thermodynamic and kinetic considerations. |
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