| Effect of Cerium on Microstructures and High Temperature Oxidation Resistance of An Nb-Si System In-Situ Composite |
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| 作者姓名： | 刘爱勤 孙璐 李树索 韩雅芳 |
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| 作者单位： | School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083,China |
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| 基金项目： | Project supported by the National ＂863＂ Project （2003AA305810） |
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| 摘 要： | Nb-16Si-24Ti-6Cr-6A1-2Hf-xCe （x =0, 0.05, 0.1,02.5, 0.5, 1 （%, atom fraction）） in situ composites were prepared by arc melting The microstmcture and the effect of rare earth element cerium on 1250℃ oxidation resistance of the composites were investigated with scanning electron microscopy （SEM） and X-ray energy disperse spectrum （EDS）, as well as X-ray diffraction （XRD）. The experimental results showed that the high temperature oxidation resistance of the alloy was improved by adding a proper amount of cerium （Ce）. The effect of Ce was considered as the concurrent of the following three factors： first, the oxide of Ce formed in the interface reduced the internal oxidation rate; second, the lath shaped oxide containing Ce increased the cracking resistance and reduced the expansion of the oxide scale; and third, the decrease of the sificide volume fraction on account of Ce addition reduces the power of the sample resisting oxygen penetration.
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| 关 键 词： | 氧化阻力 合金 稀土 技术性能 |
| 文章编号： | 1002-0721（2007）04-0474-06 |
| 收稿时间： | 3 November 2006 |
| 修稿时间： | 2006-11-03 |
Effect of Cerium on Microstructures and High Temperature Oxidation Resistance of An Nb-Si System In-Situ Composite |
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| Liu Aiqin,Sun Lu,Li Shusuo,Han Yafang.Effect of Cerium on Microstructures and High Temperature Oxidation Resistance of An Nb-Si System In-Situ Composite[J].Journal of Rare Earths,2007,25(4):474-479. |
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| Authors: | Liu Aiqin Sun Lu Li Shusuo Han Yafang |
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| Affiliation: | School of Materials Science and Engineering, Beijing University of Aeronautics and A stronautics, Beijing 100083 China |
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| Abstract: | Nb-16Si-24Ti-6Cr-6Al-2Hf-xCe (x=0, 0.05, 0.1, 0.25, 0.5, 1 (%, atom fraction)) in situ composites were prepared by arc melting. The microstructure and the effect of rare earth element cerium on 1250 ℃ oxidation resistance of the composites were investigated with scanning electron microscopy (SEM) and X-ray energy disperse spectrum (EDS), as well as X-ray diffraction (XRD). The experimental results showed that the high temperature oxidation resistance of the alloy was improved by adding a proper amount of cerium (Ce). The effect of Ce was considered as the concurrent of the following three factors: first, the oxide of Ce formed in the interface reduced the internal oxidation rate; second, the lath shaped oxide containing Ce increased the cracking resistance and reduced the expansion of the oxide scale; and third, the decrease of the silicide volume fraction on account of Ce addition reduces the power of the sample resisting oxy gen penetration. |
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| Keywords: | oxidation resistance in-situ composite Nb-Si alloy rare earths |
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