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硼的添加对Mg2Ni储氢合金吸放氢性能的影响
引用本文:陈玉安,林嘉靖,唐霞,杨丽玲. 硼的添加对Mg2Ni储氢合金吸放氢性能的影响[J]. 稀有金属, 2012, 36(2): 242-247
作者姓名:陈玉安  林嘉靖  唐霞  杨丽玲
作者单位:1. 重庆大学材料科学与工程学院,重庆400044;国家镁合金材料工程技术研究中心,重庆400044
2. 重庆大学材料科学与工程学院,重庆,400044
基金项目:国际科技合作项目(2008DFR50040-08);重庆大学大型仪器设备开放基金资助项目
摘    要:镁系储氢合金有着价格低廉、储氢量大等优点,作为机载储氢材料有着广泛的应用前景,但其过高的氢分解温度,过慢的分解速度等缺点制约着实际应用.采用机械球磨制备出Mg2 Ni-xB(x =0%,1%,5%,10%,15%)系列储氢合金.通过XRD分析了合金的物相结构,采用P-C-T测试仪测定了合金的吸放氢性能,研究了添加不同含量的B对Mg2Ni合金吸放氢性能的影响.研究结果表明,B的添加对合金在200和300℃下吸放氢性能的改善作用不明显,但添加B的合金在400℃下的吸氢量均较Mg2Ni高,B的添加量由1%增至15%的合金吸氢量分别为3.09%,3.00%,2.81%,2.84%,而Mg2Ni的吸氢量则只有2.60%.随着B含量的增加,含B合金吸氢量略有降低;在含B的试样中,含5%B的合金吸氢速率最大,仅需180 s便能完成吸氢.所有含B合金的放氢平台均较Mg2Ni高且较为平坦.本次实验表明,B的添加量对合金性能的提升存在一个最优值,本次实验结果显示,添加5%B相对较好地改善合金的储氢性能,提高合金吸氢量和放氢平台压的同时能保持较快的吸氢速率.

关 键 词:  机械球磨  Mg2Ni  储氢性能

Effect of Boron Addition on Hydriding/Dehydriding Properties of Mg2Ni Hydrogen Storage Alloys
Chen Yu'an , Lin Jiajing , Tang Xia , Yang Liling. Effect of Boron Addition on Hydriding/Dehydriding Properties of Mg2Ni Hydrogen Storage Alloys[J]. Chinese Journal of Rare Metals, 2012, 36(2): 242-247
Authors:Chen Yu'an    Lin Jiajing    Tang Xia    Yang Liling
Affiliation:1(1.College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;2.National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China)
Abstract:With the advantages of low price and high capacity,Mg-based hydrogen storage alloys became the promising candidate for competitive hydrogen storage.But the inherence disadvantages,such as the high temperature of hydride decomposition,slow absorption/desorption kinetics,hindered the application of the Mg-based hydrogen storage alloys.Mg2Ni-xB(x=0%,1%,5%,10%,15%) series alloys were synthesized by mechanical grinding.The effects of boron addition on the hydriding/dehydriding performances of Mg2Ni hydrogen storage alloys were studied.The types of phases in the alloys were determined by X-ray diffraction and the hydrogen storage properties of the alloys were measured by pressure-composition isotherm(P-C-T) method.The results showed that the improvement of boron addition to the hydrogen storage properties of Mg2Ni was unobvious at 200 and 300 ℃.At 400 ℃,in the case of the alloys containing boron,the hydrogen absorption capacities decreased with the increase of the contents of boron while were higher than that of Mg2Ni.Compared with the 2.60% of Mg2Ni,the capacities of the alloys containing boron were 3.09%,3.00%,2.81%,2.84% respectively.The hydrogen absorption rate of Mg2Ni-5%B was the fastest of 2MgNi-xB series alloys;it only took 180 s to complete the hydriding.The plateau pressure of the alloys containing boron was higher and flatter than that of Mg2Ni at 400 ℃.The results showed that the level of addition of boron for improving the hydrogen storage properties of Mg2Ni had an optimum value.The alloy with boron addition of 5% had the best properties.It provided the highest hydrogen capacity and fastest hydride rate,as well as higher plateau pressure.
Keywords:boron  mechanical grinding  Mg2Ni  hydrogen storage properties
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