Oxidation behavior of micro-sized Al2O3–TiC–Co composites prepared from cobalt-coated powders |
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| Authors: | Rui-xia Shi Jianrong Wang Jia Li Yan-sheng Yin |
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| Affiliation: | aSchool of Materials Science and Engineering, University of Jinan, Jinan 250022, China;bInstitute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China |
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| 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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| Keywords: | Oxidation behavior Kinetics Al2O3&ndash TiC&ndash Co Composites Cobalt-coated |
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