| 氢化脱氢法制备Nb-Ti基合金粉末 |
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| 引用本文： | 李启军,章林,李兵兵,魏东斌,曲选辉.氢化脱氢法制备Nb-Ti基合金粉末[J].稀有金属材料与工程,2020,49(1):93-100. |
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| 作者姓名： | 李启军 章林 李兵兵 魏东斌 曲选辉 |
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| 作者单位： | 北京科技大学 新材料技术研究院 北京材料基因工程高精尖创新中心,北京科技大学 新材料技术研究院 北京材料基因工程高精尖创新中心,北京科技大学 新材料技术研究院 北京材料基因工程高精尖创新中心,北京科技大学 新材料技术研究院 北京材料基因工程高精尖创新中心,北京科技大学 新材料技术研究院 北京材料基因工程高精尖创新中心 |
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| 基金项目： | 国家自然科学基金项目（51174029, 51574030）和国家重点研发计划项目 (2017YFB0305600, 2017YFB0306000) |
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| 摘 要： | 采用氢化-脱氢法制备了微细轻质Nb-Ti基合金粉末,并研究了吸氢/解吸行为。300℃时,氢吸收明显,400℃时吸氢量达到饱和值1.12%(质量分数)。氢化后形成二元和三元氢化物(Nb0.803V0.197H,Nb0.696V0.304H,TiHx)。由于氢致脆化效应,吸氢后的粉末破碎后得到细粒径的氢化粉末。在脱氢过程中,氢含量在300℃时有效降低至0.001%,实现了从铌或钛氢化物到单相固溶体合金(β相)的相转变。由于组分元素与氧反应活性高,粉末中氧含量随吸氢或脱氢温度的升高而增加。为了防止杂质氧的污染,氢化和脱氢温度都选择为400℃。实验最终得到了主要粒径小于10μm,氧含量为2980μg/g的微细Nb基合金粉末,且粉末表面的氧杂质主要以Nb2O5和TiO2的形式存在。
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| 关 键 词： | 粉末冶金 Nb-Ti基合金 粉末制备 氢化 脱氢 |
| 收稿时间： | 2018/8/18 0:00:00 |
| 修稿时间： | 2018/10/8 0:00:00 |
Nb-Ti based alloy powder prepared by hydride-dehydride method |
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| Qijun Li,Lin Zhang,Bingbing Li,Dongbin Wei and Xuanhui Qu.Nb-Ti based alloy powder prepared by hydride-dehydride method[J].Rare Metal Materials and Engineering,2020,49(1):93-100. |
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| Authors: | Qijun Li Lin Zhang Bingbing Li Dongbin Wei and Xuanhui Qu |
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| Affiliation: | Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing |
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| Abstract: | Micro-fine lightweight Nb-Ti based alloy powder was fabricated by a hydride-dehydride method,and the hydrogen absorption/desorption behavior was investigated.Results show that obvious hydrogen absorption occurs at 300℃,and the absorbed hydrogen quantity reaches a saturation value of 1.12 wt%at 400℃.Binary and ternary hydrides(Nb0.803V0.197H,Nb0.696V0.304H and TiHx)are formed after hydrogenation.Hydrogen-induced embrittlement facilitates the pulverization of the thin alloy plate.During dehydrogenation process,hydrogen content is effectively reduced to 0.001 wt%at 300℃.Phase transformation from niobium or titanium hydrides to single phase solid solution alloy(βphase)is achieved.Oxygen content of the powder increases with increasing hydrogenation or dehydrogenation temperature due to the high reactivity of constituent elements with oxygen,and both hydrogenation and dehydrogenation temperature of 400℃is selected in order to prevent severe oxygen intake.Micro-fine Nb-based alloy powder with average particle size<10μm and oxygen content of 2980μg/g is obtained.Superfacial contamination of the obtained powder is detected,and oxygen impurity exists in the form of Nb2 O5 and TiO2. |
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| Keywords: | Powder metallurgy Nb-Ti based alloy powder preparation hydrogenation dehydrogenation |
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