闫自强,赵凤光,刘润,孙昊

• 1:内蒙古科技大学材料科学与工程学院
• 2:轻稀土资源绿色提取与高效利用教育部重点实验室
• 3:内蒙古科技大学稀土产业学院
• 4:内蒙古自治区新金属材料重点实验室

摘要(Abstract)：

通过真空感应熔炼技术制备了Mg_(24-x)Sm_xNi_(10)Cu_2(x=0、0.5、1.0、1.5和2.0)储氢合金，并进行了均匀化处理。采用X射线衍射仪、扫描电镜和手动PCT储氢测试仪对合金的微观结构、相组成及性能进行了分析。结果表明：Mg_(24)Ni_(10)Cu_2合金的相组成为Mg_2Ni和少量Mg相，当添加Sm后，合金的主相仍然为Mg_2Ni相，同时生成了少量的SmMgNi_4相，其中，Mg_2Ni为吸氢相，而SmMgNi_4相不参与氢吸收；Sm的添加能够显著提升合金的动力学和热力学性能，其中，Mg_(23)Sm_1Ni_(10)Cu_2合金的氢化反应焓变ΔH和熵变ΔS分别为-50.58 kJ/mol和-95.54 J/(K·mol);Sm添加并未改变合金的吸放氢机制，合金的吸氢过程遵循三维扩散机制，而放氢过程则受是相界反应控制。

关键词(KeyWords)： Sm;储氢合金;活化能;焓变;吸放氢机制

Abstract:

Keywords:

基金项目(Foundation): 内蒙古自治区自然科学基金(2022LHMS05018);; 内蒙古高校基本科研业务费项目(2023QNJS030)

作者(Author): 闫自强,赵凤光,刘润,孙昊

DOI: 10.13289/j.issn.1009-6264.2024-0451

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