| Nb离子注入γ-TiAl的高温循环氧化行为 |
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| 引用本文： | 王薇,史晶宇,张永刚,张通和.Nb离子注入γ-TiAl的高温循环氧化行为[J].北京航空航天大学学报,2001,27(2). |
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| 作者姓名： | 王薇 史晶宇 张永刚 张通和 |
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| 作者单位： | 1. 北京航空航天大学材料科学与工程系
2. 北京师范大学低能核物理所 |
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| 摘 要： | 研究了Nb离子注入的γ-TiAl合金在1123K和1173K空气中的高温循环氧化行为，用配有能谱仪的扫描电子显微镜对氧化层的形貌、显微结构进行了分析，用俄歇谱仪分析了注入元素和氧化层中各元素的分布.结果表明：Nb离子注入可以提高γ-TiAl合金的抗循环氧化性能.提高其抗氧化性能的主要原因归结于Nb离子在TiO2中的掺杂作用.高价Nb的掺杂，降低了TiO2的缺陷浓度，使TiO2的生长受到抑制，在氧化初期形成了Al2O3保护层，从而推迟了氧化层的剥落时间.但Nb离子注入的γ-TiAl合金不具有长期的抗循环氧化性能.
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| 关 键 词： | 离子注入 高温氧化试验 铌离子 |
Cycling Oxidation Behavior of Nb-ion Implanted γ-TiAl |
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| WANG Wei,SHI Jing-yu,ZHANG Yong-gang,ZHANG Tong-he.Cycling Oxidation Behavior of Nb-ion Implanted γ-TiAl[J].Journal of Beijing University of Aeronautics and Astronautics,2001,27(2). |
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| Authors: | WANG Wei SHI Jing-yu ZHANG Yong-gang ZHANG Tong-he |
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| Abstract: | The thermal cycling oxidation behaviors of Nb-ion implanted γ-TiAl in air were studied in the temperature range of 1123～1173K. The microstr uctures of the oxide scales were examined by SEM equipped with EDS. Nb distribution and depth profiles of elements were analyzed by AES. The results indicated that the cyclic oxidation resistance of γ-TiAl alloy could be improved by Nb ion implantation. The reason why Nb-ion implantation improves the cyclic oxidation properties may be ascribed to doping of the titania lattice by Nb5+ ions, which may inhibit the growth of TiO2 and enhance the growth rate of Al2O3. The formation of Al2O3 protective layer at the early stage decreased the oxidation rate and delayed the spallation of oxide scale. But Nb-ion implanted γ-TiAl has no long effect to thermal cycling oxidation resistance. |
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