【作者】 周玉立； 朱云峰； 李李泉；

【Author】 Yuli Zhou 1 , Yunfeng Zhu 1 , Liquan Li 1,* 1 College of Material Science and Technology, Nanjing University of Technology, 5 Xinmofan Road, Nanjing, 210009

【机构】 南京工业大学材料科学与工程学院；

【摘要】 本文主要针对镁基合金脱氢温度高和氢化物过于稳定的问题,基于金属铝的热传导性能优异,且储量丰富和价格低廉等特点,特别是镁铝合金能显著提高镁基体系吸放氢热力学、动力学及抗氧化性能等优越性,选取Mg17Al12合金作为研究对象。实验采用燃烧合成法制备Mg17Al12合金,与常规制备方法(熔炼法、球磨法和块体机械合金化)相比,燃烧合成法能在较短时间、较低温度下得到高纯度、高活性的Mg17Al12储氢合金。接着,本文讨论了不同原料粒径、预处理方式(包括球磨、压片、超声等)、合成温度、保温时间等对产物相纯度的影响。研究表明:铝粉粒径为20μm,镁粉粒径为45μm时,球磨预混3小时后,在400℃下燃烧合成,无需保温,即可得到高纯度Mg17Al12合金。最后,本文提出了燃烧合成法制备Mg-Al合金的反应机理。更多还原

【Abstract】 The poor hydrogen absorption/desorption kinetics and rather high dissociation temperature of the Mg-based hydrogen storage alloy have been attempted to surmount by the addition of aluminum, forming the Mg 17 Al 12 alloy, a kind of light alloy with high hydrogen capacity, which has also been proved to improve both the thermodynamic and kinetics, along with the resistance towards oxygen contamination. Comparing with several conventional methods to synthesize Mg 17 Al 12 alloy, such as ball milling, bulk mechanical milling and melting, the combustion synthesis method stood out with higher purity and higher activity of the product, as well as, lower temperature and shorter time of the process. The experimental results showed that, when Mg powder with 45 μm and Al powder with 20 μm were mixed though ball milling for 3h and then synthesized at only 400 ℃ without holding time, the Mg 17 Al 12 alloy with high purity can be obtained. Besides, the combustion synthesis mechanism of Mg-Al alloy was proposed.更多还原