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Hydriding/dehydriding properties of NdMgNi alloy with catalyst CeO_2

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Journal of Rare Earths 2016年第4期34卷 407-412页

作者：李霞张羊换杨泰许剑轶赵栋梁 College of Materials and Metallurgy Inner Mongolia University of Science and Technology Department of Functional Materials Research Central Iron and Steel Research Institute

Hydrogen storage composites Nd2Mg17-50 wt.%Ni-x wt.%CeO2（x=0, 0.5, 1.0, 1.5, 2.0） were obtained by induction-ball milling method. The catalytic effect of CeO_2 on hydriding kinetics of Nd_2Mg17-50 wt.%Ni composite was investigated. X-ray diffraction（XRD） and high resolution transmission electron microscopy（HRTEM）, selected area electron diffraction（SAED） analyses showed that Nd_2Mg17-50 wt.%Ni alloy had a multiphase structure, consisting of NdMg12, NdMg_2Ni, Mg_2Ni and Ni phases and the addition of catalyst CeO_2 prompted the composites to be partly transformed into amorphous strucutre. The CeO_2 improved the maximum hydrogen capacity of Nd_2Mg17-50 wt.%Ni alloy from 3.192 wt.% to 3.376 wt.%（x=1.0）. What＇s more, the increment of diffusion coefficient D led to the faster hydriding kinetics, which was calculated by Avrami-Erofeev equation. The dehydrogenation temperature reduced from 515.54 to 504.72 K was mainly caused by the decrease of activation energy from 93.28 to 69.36 kJ /mol, which was proved by the Kissinger equation.

关键词： Nd-Mg-Ni alloy ball milling hydriding/dehydriding catalysis rare earths

西北太平洋2017年秋季海浪、波浪能观测分析

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哈尔滨工程大学学报 2019年第7期40卷 1269-1276页

作者：刘敏赵栋梁河北农业大学海洋学院河北秦皇岛066000 中国海洋大学物理海洋教育部重点实验室山东青岛266100

针对西北太平洋浪场特点研究中现场观测数据的不足,本文利用海洋综合调查船的现场观测数据综合分析了混合浪、涌浪和风浪的变化特点,并计算波能的空间分布。结果表明:所观测海域的混合浪、涌浪和风浪的波高变化范围分别为0.7~5.7、0.3~... 详细信息

针对西北太平洋浪场特点研究中现场观测数据的不足,本文利用海洋综合调查船的现场观测数据综合分析了混合浪、涌浪和风浪的变化特点,并计算波能的空间分布。结果表明:所观测海域的混合浪、涌浪和风浪的波高变化范围分别为0.7~5.7、0.3~5.7和0.6~4.1 m。周期和波能的变化范围分别为5.2~9.5 s和1.3~143.1 kW/m。ST0303站风速较小,混合浪浪高、浪向和波能均与涌浪具有较高的相关性,浪场特点主要取决于涌浪场。

关键词：西北太平洋风风浪涌浪混合浪波能密度

Structures and electrochemical performances of RE-Mg-Ni-Mn-based alloys prepared by casting and melt spinning

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Journal of Rare Earths 2016年第12期34卷 1241-1251页

作者：张羊换杨泰蔡颖胡锋祁焱赵栋梁 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

La-Mg-Ni-Mn-based AB2-type La（1–x）CexMgNi（3.5）Mn（0.5）（x=0–0.4） alloys were prepared by melt spinning technology. The detections of X-ray diffraction（XRD） and scanning electron microscopy（SEM） indicated that the experimental alloys consisted of a major phase LaMgNi4 and a secondary phase LaNi5. With spinning rate growing, the abundance of LaMgNi4 phase increased and that of LaNi5 phase decreased. Moreover, with the melt spinning rate increasing, both the lattice constants and cell volumes increased, and further accelerated the grains refinement of the alloys. The electrochemical tests showed that the as-spun alloys possessed excellent capability of activation, achieving the maximum discharge capacities just at the first cycling without any activation needed. As for the as-spun alloys, its discharge potential characteristics could be improved obviously by adopting the technology of melt spinning. In addition, the melt spinning raised electrochemical cycle stability of the alloys, the main reason was that the melt spinning enhanced the anti-pulverization ability of the alloys. With spinning rate increasing, the discharge capacity of the alloys presented a tendency to increase firstly then decrease. Moreover, the electrochemical kinetics of the alloys showed the same trend under fixed condition.

关键词： AB2-type alloy Ce substitution for La melt spinning electrochemical performance kinetics rare earths

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氧化铝气态悬焙烧炉返灰系统工艺流程的改进

轻金属 2001年第11期 17-19页

作者：赵东亮中国长城铝业公司河南郑州450041

长城铝业公司氧化铝厂从国外引进一台1850t／d氧化铝气态悬浮焙烧炉。由于冷却分离旋风系统温度偏低，返灰量大，没有达到原设计的要求，造成氧化铝成品质量不稳定，灼减偏高。本文从焙烧过程中氧化铝晶型结构的变化入手，找出了灼减偏... 详细信息

长城铝业公司氧化铝厂从国外引进一台1850t／d氧化铝气态悬浮焙烧炉。由于冷却分离旋风系统温度偏低，返灰量大，没有达到原设计的要求，造成氧化铝成品质量不稳定，灼减偏高。本文从焙烧过程中氧化铝晶型结构的变化入手，找出了灼减偏高的原因，提出了解决问题的方案，进行了技术改进，收到了良好效果。

关键词：气态悬浮焙烧炉电收尘返灰技术改进氧化铝工艺流程

Hydrogen Absorption and Electrochemical Properties of As-Quenched Nanocrystalline Mg20Ni10 – xCux (x = 0 – 4) Alloys

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Materials Sciences and Applications 2010年第3期1卷 168-176页

作者： Jinliang Gao Zhonghui Hou Qilu Ge dongliang zhao Shihai Guo Yanghuan Zhang 不详

Nanocrystalline Mg2Ni-type alloys with nominal compositions of Mg20Ni10 – xCux (x = 0, 1, 2, 3, 4) were synthesized by rapid quenching technique. The microstructures of the as-cast and quenched alloys were characterized by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinetics of the alloys were measured using an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage performances were tested by an automatic galvanostatic system. The results show that all the as-quenched alloys hold a typical nanocrystalline structure, and the rapid quenching does not change the major phase Mg2Ni. The hydrogen absorption and desorption capacities of the alloys significantly increase with rising quenching rate. Additionally, the rapid quenching significantly improves the electrochemical hydrogen storage capacity of the alloys, but it slightly impairs the cycle stability of the alloys.

关键词： Mg2Ni-type Alloy Rapid Quenching Nanocrystalline Hydrogen Absorption Electrochemical Properties

An investigation on electrochemical hydrogen storage performances of Mg-Y-Ni alloys prepared by mechanical milling

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Journal of Rare Earths 2015年第8期33卷 874-883页

作者：张羊换张朋军袁泽明杨泰祁焱赵栋梁 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Abstract： The nanocrystalline and amorphous Mg2Ni-type electrode alloys with a composition of Mg20-xYxNi10 （x=0, 1, 2, 3 and 4） were fabricated by mechanical milling. Effects of Y content on the structures and electrochemical hydrogen storage performances of the alloys were investigated in detail. The inspections of X-ray diffraction （XRD）, transmission electron microscopy （TEM） and scanning electron microscopy （SEM） revealed that the substitution of Y for Mg brought on an obvious change in the phase composition of the alloys. The substitution of Y for Mg resulted in the formation of secondary YMgNi4 phases without altering the major phase Mg2Ni when Y content x≤1. But with the further increase of Y content, the major phase of the alloys changed into YMgNi4 phase. In addition, such substitution facilitated the glass forming of the Mg2Ni-type alloy. The discharge capacities of the as-milled alloys had the maximum values with Y content varying, but Y content with which the alloy yielded thc biggest discharge capacity was changeable with milling time varying. The substitution of Y for Mg had an insignificant effect on the activation ability of the alloys, but it dramatically improved the cycle stability of the as-milled alloys. The effect of Y content on the electrochemical kinetics of the alloys was related to milling time. When milling time was 10 h, the high rate discharge ability （HRD）, diffusion coefficient of hydrogen atom （D） and charge transfer rate all had the maximum value with Y content increasing, but they always decreased in the same condition when milling time increased to 70 h.

关键词： Mg2Ni-type alloy Y substitution for Mg milling time electrochemical performance rare earths

Electronic Structure Effect on Model Cluster for L1_2 Structure of Al_3Ti Intermetallic Compound with an Addition of Alloying Elements Fe, Ni and Cu

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Journal of Materials Science & Technology 1995年第5期11卷 369-372页

作者： Senying LIU Rongze HU dongliang zhao and Chongyu WANG(Central Iron and Steel Research Institute, Beijing, 100081, China)(To whom correspondence should be addressed)Ping LUO(National Research Cent or Certified Materials, Beijing, 100013, China)Zhongjie P Central Iron and Steel Research Inst Beijing China

By use of self-consistent field Xα scattered-wave (SCF-Xα-SW) method, the electronic structure was calculated for four models of Ti4Al14X (X=Al, Fe, Ni and Cu) clusters. The Ti4Al14X cluster was developed based on L12 Al3Ti-base intermetallic compound. The results are presented using the density of states (DOS) and one-electron properties, such as relative binding tendency between the atom and the model cluster, and hybrid bonding tendency between the alloying element and the host atoms. By comparing the four models of Ti4Al14X cluster, the effect of the Fe, Ni or Cu atom on the physical properties of Al3Ti-based L12 intermetallic compounds is analyzed. The results indicate that the addition of the Fe, Ni or Cu atom intensifies the relative binding tendency between Ti atom and Ti4Al14X cluster. It was found that the Fermi level (EF) lies in a maximum in the DOS for Ti4Al14Al cluster; on the contrary, the EF comes near a minimum tn the DOS for Ti4Al14X (X=Fe, Ni and Cu) cluster. Thus the L12 crystal structure for binary Al3Ti alloy is unstable, and the addition of the Fe, Ni or Cu atom to Al3Ti is benefical to stabilize L12 crystal structure. The calculation also shows that the Fe, Ni or Cu atom strengthens the hybrid bonding tendency between the central atom and the host atoms for Ti4Al14X cluster and thereby may lead to the constriction of the lattice of Al3Ti-base intermetallic compounds.

关键词： Fe Electronic Structure Effect on Model Cluster for L12 Structure of Al3Ti Intermetallic Compound with an Addition of Alloying Elements Fe Al Ti Cu

Electrochemical hydrogen storage performances of the nanocrystalline and amorphous(Mg_(24)Ni_(10)Cu_2)_(100–x)Nd_x(x=0–20) alloys applied to Ni-MH battery

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Journal of Rare Earths 2013年第12期31卷 1175-1182页

作者：张羊换王海涛杨泰翟亭亭张国芳赵栋梁 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Melt spinning technology was used to prepare the Mg2 Ni-type（Mg24 Ni10 Cu2）100–x Ndx（x=0,5,10,15,20） alloys in order to obtain a nanocrystalline and amorphous *** effects of Nd content and spinning rate on the structures and electrochemical hydrogen storage performances of the alloys were *** structure characterizations of X-ray diffraction（XRD）,transmission electron microscopy（TEM） and scanning electron microscopy（SEM） linked with energy dispersive spectroscopy（EDS） revealed that the as-spun Nd-free alloy displayed an entire nanocrystalline structure,whereas the as-spun Nd-added alloys held a nanocrystalline and amorphous structure and the degree of amorphization visibly increased with the rising of Nd content and spinning rate,suggesting that the addition of Nd facilitated the glass forming of the Mg2 Ni-type *** electrochemical measurements indicated that the addition of Nd and melt spinning improved the electrochemical hydrogen storage performances of the alloys *** discharge capacities of the as-cast and spun alloys exhibited maximum values when Nd content was x=10,which were 86.4,200.5,266.3,402.5 and 452.8 mAh/g corresponding to the spinning rate of 0（As-cast was defined as the spinning rate of 0 m/s）,10,20,30 and 40 m/s,*** cycle stability（S20,the capacity maintain rate at 20thcycle） of the as-cast alloy always rose with the increasing of Nd content,and those of the as-spun alloys exhibited the maximum values for Nd content x=10,which were 77.9%,83.4% 89.2% and 89.7%,corresponding to the spinning rate of 10,20,30 and 40 m/s,respectively.

关键词： Mg2 Ni-type alloys Nd addition melt spinning nanocrystalline and amorphous electrochemical hydrogen storage performances rare earths

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贝叶斯统计方法在海浪方向谱研究中的应用

海洋学报 2000年第5期22卷 31-40页

作者：赵栋梁黄娟青岛海洋大学物理海洋研究所青岛266003 国家海洋局北海分局青岛266033

较详细介绍了贝叶斯统计方法在海浪方向谱估计中的应用，指出先验分布的不同对估计结果没有影响，由于均匀分布与最大熵原则相对应，使其具有某种特殊性．数值模拟表明贝叶斯方法对双峰方向分布估计的有效性，将其应用于黑海实测资... 详细信息

较详细介绍了贝叶斯统计方法在海浪方向谱估计中的应用，指出先验分布的不同对估计结果没有影响，由于均匀分布与最大熵原则相对应，使其具有某种特殊性．数值模拟表明贝叶斯方法对双峰方向分布估计的有效性，将其应用于黑海实测资料，证明双峰方向分布的出现依赖于估计方法分辨力的大小，而用最大似然法得到的双峰方向分布值得怀疑．最后给出出现双峰方向分布的一种可能物理解释。

关键词：贝叶斯统计方法海洋方向谱先验分布预报