| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effect of CoO and Cr2O3 Composite Doping on Densification and High-temperature Oxidation Resistance of Cermets |
| LIN Qiquan, ZHOU Hang, DONG Wenzheng, QING Chunkai
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| Hunan Key Laboratory of Welding Robots and Applied Technologies, Xiangtan University, Xiangtan 411105, China |
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Abstract The 17Ni/ (10NiO-NiFe2O4) cermets doped with CoO and Cr2O3 compound additives were prepared by powder metallurgy method. XRD, SEM and other means of detection and analysis were used to explore the impact of the CoO and Cr2O3 compound doped on 17Ni/ (10NiO-NiFe2O4) cermet on the phase composition, microstructure, sintering densification and high temperature oxidation resistance. The results showed that CoO and Cr2O3 become solid solution in the NiFe2O4 lattice after composite doping, accelerated the sintering-densification.The CoO and Cr2O3 complex additives helped 17Ni/ (10NiO-NiFe2O4) cermet form a dense oxide layer,which can reduce the diffusion rate of O2 and me-tal Ni,and improved the high temperature oxidation resistance. When the composite doped amount of CoO and Cr2O3 is 1wt% (m (CoO)∶m (Cr2O3)=2∶1),the sample has the best high temperature oxidation resistance, which the oxidation weight gain per unit was 56.28% less than the undoped sample.
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Published: 12 March 2020
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| Fund:This work was financially supported by the Special Project on International Cooperation of the Ministry of Science and Technology (2010DFA52130),National Natural Science Foundation of China (51575467). |
| About author:: Qiquan Lin, professor, doctoral supervisor, Xiangtan University. Focusing on the research of metal plastic forming theory and simulation technology, plate forging technology and preparation of special materials; Wenzheng Dong, associate professor, Xiangtan University. Focusing on the research of advanced plastic processing technology and equipment, plastic proces-sing friction and lubrication. |
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2020, Vol. 34 
