Preparation of ultrafine Ti(C, N)-based cermet using oxygen-rich powders |
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Authors: | Feng Ping He Yue-hui Xiong Wei-hao and Xiao Yi-feng |
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Affiliation: | (1) State Key Laboratory of Powder Metallurgy, Central South University, 410083 Changsha, China;(2) State Key Laboratory of Die & Mould Technology, Huazhong University of Science and Technology, 430074 Wuhan, China |
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Abstract: | The availability using oxygen-rich powders to prepare ultrafine Ti(C,N)-based cermets was investigated. The deoxidation process,
denitrification phenomenon and the effect of deoxidation on microstructure and mechanical properties of sintered samples were
discussed, respectively. The results show that oxygen in the samples prepared even with high oxygen contained in starting
powders can be almost completely cleaned away through suitable sintering process. The ultrafine oxygen-rich powders have a
significant effect on microstructure, which promotes the formation of white core phase. A ultrafine Ti(C,N)-based cermet with
mean particle size of 0.30 μm, uniform microstructure and excellent mechanical properties is successfully prepared. It is
also found that there exists severe denitrification phenomenon in the preparation process of ultrafine Ti(C,N)-based cermet.
Foundation item: Project(50323008) supported by the National Natural Science Foundation of China |
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Keywords: | Ti(C N)-based cermet ultrafine structured grain solid-state sintering deoxidation microstructure mechanical property |
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