| Effect of sintering atmosphere on microstructure and properties of TiC based cermets |
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| 作者姓名： | 周书助 王社权 王零森 丁泽良 |
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| 作者单位： | [1]Department of Metallurgy, Hunan University of Industry, Zhuzhou 412000, China [2]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | The effect of the sintering atmospheres （vacuum, N2, Ar） on the microstructures and properties of the TiC based cermets was studied using XRD, SEM/BSE and energy dispersive spectrometer. Compared with the alloy sintered in vacuum, the carbon content of the specimen sintered in N2 and Ar is lower by 0.5%; and the nitrogen content is higher by 0.3% when sintered in nitrogen. The central part of the ring structure may be carbide with either a high W or Ti content. The ring structures are （Ti, W, Ta, Mo, Co, Ni）C solid solutions with different metallic elements and distributions. The composition of the binder phase is （Co, Ni） solid solution with different Ti, W, Ta, Mo, C contents. The structures are uniform for the cermets sintered in vacuum and the properties are the best. When sintered in Ar or N2, the O2 and N2 in the atmosphere take part in the sintering reaction to break the carbon balance in the cermets to form a shell structure and defects, which results in poor density, microhardness （HV） and transverse rupture strength （TRS）.
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| 关 键 词： | 碳化钛基金属陶瓷 烧结气氛 显微结构 机械性能 |
| 收稿时间： | 2006-05-21 |
| 修稿时间： | 2006-07-27 |
Effect of sintering atmosphere on microstructure and properties of TiC based cermets |
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| Zhou Shu-zhu , Wang She-quan , Wang Lin-sen and Ding Ze-liang.Effect of sintering atmosphere on microstructure and properties of TiC based cermets[J].Journal of Central South University of Technology,2007,14(2):206-209. |
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| Authors: | Zhou Shu-zhu Wang She-quan Wang Lin-sen and Ding Ze-liang |
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| Affiliation: | (1) Department of Metallurgy, Hunan University of Industry, Zhuzhou, 412000, China;(2) State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China |
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| Abstract: | The effect of the sintering atmospheres (vacuum, N_2, Ar) on the microstructures and properties of the TiC based cermets was studied using XRD, SEM/BSE and energy dispersive spectrometer. Compared with the alloy sintered in vacuum, the carbon content of the specimen sintered in N_2 and Ar is lower by 0.5%; and the nitrogen content is higher by 0.3% when sintered in nitrogen. The central part of the ring structure may be carbide with either a high W or Ti content. The ring structures are (Ti, W, Ta, Mo, Co, Ni)C solid solutions with different metallic elements and distributions. The composition of the binder phase is (Co, Ni) solid solution with different Ti, W, Ta, Mo, C contents. The structures are uniform for the cermets sintered in vacuum and the properties are the best. When sintered in Ar or N2, the O_2 and N2 in the atmosphere take part in the sintering reaction to break the carbon balance in the cermets to form a shell structure and defects, which results in poor density, microhardness (HV) and transverse rupture strength (TRS). |
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| Keywords: | TiC based cermets sintering atmosphere microstructure mechanical properties |
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