摘要
研究了Ce-10La合金在氢气中的表面气相反应行为,探讨该合金在氢化过程中表面层成分、组织结构和形貌的演变规律,并讨论了水蒸气对合金氢化反应的影响。结果表明,Ce-10La合金在空气中非常容易被氧化;500 K温度以下(473 K)Ce-10La合金与氢气的表面气相反应速率较慢;当温度高于500 K时(523 K),Ce-10La合金与氢气反应生成氢化物的速率明显加快、氢化反应完全。在有水蒸气存在的情况下,Ce-10La合金首先与水蒸气反应生成氢氧化物并放出氢气,三价Ce遇空气被氧化为CeO2。在此温度下,Ce-10La合金与H2的反应活性非常低,H2的存在反而降低了合金与水蒸气的反应程度。
The surface vapor reaction behavior of Ce-10La alloy in H2 was investigated. The evolution of surface layer composition, microstructure and morphology during hydrogenation process of the Ce-10La alloy as well as the effect of water vapor on the hydrogenation was discussed. The results showed that Ce-10La alloy was very easy to be oxidized in air. When the temperature was lower than 500 K （473 K）, the reaction rate of Ce-10La alloy with H2 was very slow while at the temperature higher than 500 K （523 K）, the reaction of Ce-10La alloy with H2 to form hydride was quite fast and completely. In the presence of water vapor, Ce-10La alloy reacted with water, producing hydroxide and releasing H2. Trivalent Ce was oxidized into CeO2 in air. On this condition, the reactivity of Ce-10La alloy with H2 was very low. The extent of the reaction of the alloy with water vapor was limited due to the existence of H2.
出处
《矿冶工程》
CAS
CSCD
北大核心
2008年第6期94-96,共3页
Mining and Metallurgical Engineering
基金
表面物理与化学国家重点实验室基金项目(90000460200602)
材料设计及制备湖南省重点实验室开放基金项目(KF0806)
