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国家自然科学基金(21173060)

作品数:20 被引量:59H指数:5
相关作者:韩伟张密林李梅颜永得陈丽军更多>>
相关机构:哈尔滨工程大学齐齐哈尔工程学院吉林工业职业技术学院更多>>
发文基金:国家自然科学基金中国博士后科学基金国家重点基础研究发展计划更多>>
相关领域:金属学及工艺理学一般工业技术冶金工程更多>>

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20 条 记 录,以下是 1-10
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熔盐电解LiCl-KCl-AlCl_3-La_2O_3共析出制备Al-Li-La合金被引量:3
2013年
研究了LiCl-KCl-AlCl3-La2O3熔盐体系中共析出制备Al-Li-La合金的可行性。研究表明,在LiCl-KCl熔盐中,AlCl3将La2O3氯化为LaCl3,使电解制备Al-Li-La合金顺利进行。借助循环伏安法对熔盐体系的电化学行为进行分析发现,对质量比为45∶45∶5∶2的LiCl-KCl-AlCl3-La2O3熔盐,当阴极电流密度大于0.25 A/cm2,可以实现Al、Li和La的共析出。通过研究电解温度、阴极电流密度和电解时间对合金组成的影响,得到了较佳的电解参数:电解温度650℃,在LiCl-KCl混合熔盐中加入质量分数为5%的AlCl3和2%的La2O3,阴极电流密度12.5 A/cm2,电解时间1 h。X射线衍射对合金分析测试表明,合金主要由Al2La和βLi组成。
韩丽艳韩伟王冠娟孙怡孙婷婷
关键词:AL-LI合金熔盐LA2O3
Preparation of Mg-Li-La alloys by electrolysis in molten salt被引量:7
2012年
An electrochemical method was used to prepare Mg-Li-La alloys in a molten LiCl-KCl-KF-MgCl2 containing La2O3 at 943 K. The results showed preparation of Mg-Li-La alloys by electrolysis is feasible. The Mg-Li-La alloys were analyzed by means of X-ray diffraction (XRD), optical micrograph (OM) and scanning electron microscopy (SEM). XRD analysis indicates that α+Mg17La2, α+β+Mg17La2 and β+LaMg3 Mg-Li-La alloys with different lithium and lanthanum contents were obtained via galvanostatic electrolysis. The microstructures of typical α+Mg17La2 and β+LaMg3 phases of Mg-Li-La alloys were characterized by optical microscopy (OM) and scanning electron microscopy (SEM). The analysis of energy dispersive spectrometry (EDS) shows that the element of Mg distributes homogeneously in the Mg-Li-La alloy and the element of La mostly exists at grain boundaries to restrain the grain growth rate due to the larger ionic radius and lower electronegativity compared with Mg.
ZHANG Mi-linCAO PengHAN WeiYAN Yong-deCHEN Li-jun
关键词:LA2O3ELECTROLYSISMICROSTRUCTURE
Progress in preparation of rare earth metals and alloys by electrodeposition in molten salts被引量:14
2016年
Rare earth(RE) metals and their alloys have attracted considerable practical interests due to their functional properties. Because of their negative deposition potentials, RE metals cannot be electrochemically deposited from aqueous media. Using molten salt as medium provides a unique opportunity for the electrowinning and electrorefining of high-purity RE metals, as well as for the electrochemical formation of their alloys and intermetallic compounds. Certainly, the electrochemical behaviors of RE metals and their alloys have been investigated in a number of different molten salts comprising all-fiuorides,all-chlorides and mixed chloride-fiuoride media. Based on the results, RE and their alloys were produced by molten salt electrolysis. In this paper, the developments of preparation of RE metals and their alloys by electrolysis in molten salts in recent years were systematically summarized on both the local and international levels. Attention was paid mainly to the electrodeposition of RE metals and their alloys, including RE-Mg, RE-Al, RE-Ni, RE-Co,RE-Cu, RE-Fe and RE-Zn alloys.
Wei HanMei LiMi-Lin ZhangYong-De Yan
关键词:ELECTROLYSISALLOYS
Electrochemical behavior of Y(Ⅲ) and preparation of Y-Ni intermetallic compounds in molten LiCl-KCl salts被引量:6
2017年
The work concerned the electrochemical behaviors of Y(Ⅲ) on W and Ni electrodes in molten LiCl-KCl salts by a series of electrochemical techniques. The electrochemical reaction of Y(Ⅲ) to Y(0) proceeded in a one-step reduction process with the exchange of three electrons, Y(Ⅲ)+3e^–→Y(0). Compared with the cyclic voltammogram and square wave voltammogram obtained on W electrode, the reduction potential of Y(Ⅲ) on Ni electrode was observed at less negative potential than the one of Y(Ⅲ) to give pure Y metal on W electrode, which revealed the occurrence of underpotential deposition of Y(Ⅲ) on Ni electrode. Electromotive force(emf) measurements were performed to calculate the relative partial molar Gibbs energies and activities of Y in Y-Ni alloys. The standard Gibbs energies of formation for different Y-Ni intermetallic compounds were also estimated. The different Y-Ni alloys were formed by potentiostatic electrolysis at different potentials and characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and energy dispersive spectrometry(EDS). It was found that four intermetallic compounds, YNi5, Y2Ni7, YNi3 and YNi2, were selectively produced by controlling applied potential.
HAN WeiZHAO QiangWANG JiLI MeiLIU WenlaiZHANG MilinYANG XiaoguangSUN Yang
The chlorination of La_2O_3 by MgCl_2 in the LiCl-NaCl melts
2015年
The chlorination of rare earth oxides by MgCl2 was investigated in the molten chlorides. To reduce the solvent salt volatility, the LiCl-NaCl mixture was selected as a solvent by comparing the mass loss of the Li ClNaCl with LiCl-KCl melts after the addition of MgCl2 in the temperature range of 873 K to 1073 K. The dissolution behavior of La2O3 was investigated in the LiCl-NaCl-MgCl2 melts by XRD measurements and ICP-AES analysis of the melts, which indicated that La2O3 was chlorinated by Mg Cl2 to produce La Cl3. The reduction peak of La(Ⅲ) in the LiCl-Na Cl-MgCl2-La2O3 melts was observed from cyclic voltammogram and square wave voltammogram. The Mg-La alloy obtained by galvanostatic electrolysis in the LiCl-NaCl-MgCl2-La2O3 melts was characterized by XRD and SEM-EDS, indicating that the Mg-La alloy consisted of Mg and La2Mg17 phases.
王英财李梅韩伟刘垚臣刘斌颜永得张密林
关键词:ICP-AES分析SEM-EDSNACL
Electrochemical extraction of cerium and formation of Al–Ce alloy from CeO_2 assisted by AlCl_3 in LiCl–KCl melts被引量:2
2014年
This work presents an electrochemical extraction of cerium and synthesization of Al–Ce alloy in LiCl–KCl melts on Mo and Al electrodes by chlorination of CeO2 using AlCl3 at 873 K. The cyclic voltammogram on Mo electrodes in LiCl–KCl–CeO2 melt showed no obvious reduction wave other than the reduction of Li(I). After the addition of AlCl3, the signals of the reaction of Ce(ⅡI)/Ce(0) and the synthesization of Al–Ce and Al–Li alloys were investigated by cyclic voltammetry, square-wave voltammetry, open-circuit chronopotentiometry and chronopotentiometry. These results indicated that AlCl3 can chloridize CeO2 and that it is possible to extract cerium and form Al–Ce and Al–Li–Ce alloys in LiCl–KCl–CeO2–AlCl3 melts. According to potentiostatic electrolysis, only the Al4 Ce layer coated the Al electrodes. According to galvanostatic electrolysis, Al–Ce(Al4Ce, Al3 Ce, and Al92Ce8), Al2Li3, and Al phases were formed on Mo electrodes, and the content of cerium in the Al–Li–Ce alloys was more than 17 wt%.
ZHANG MengWANG HaoYuHAN WeiZHANG MiLinLI YunNaWANG YanLiXUE YunMA FuQiuZHANG XingMei
关键词:CERIUM
A new electrochemical preparation method for formation Sm-Al alloys on inert Mo electrode from Sm_2O_3 in LiCl-KCl-MgCl_2 -KF molten salts被引量:4
2012年
This work presents a new method for preparation of samarium alloy. Using A1 rod as anode, electrochemical formation of Sm-A1 alloy on Mo electrode from Sm203 in LiC1- KC1-MgC12-KF molten salts was investigated. Samarium mainly exists in the form of A12Sm in Li-Mg matrix, and the concentration of Sm in this alloy runs up to be as high as 34.7%. The reaction of samarium preparation appears like a replacement reaction. The new preparation method makes possible a high samarium content in electrochemical deposition of Sm-A1 alloy. Using A1 rod as anode consumedly decreased, the electrolytic cell voltage, and facilitated Sm deposition from Sm203. This preparation method uses 8m203 as raw materials to gain samarium alloy directly, which could revolutionize the industrial production of samarium alloys.
Qiong CHENWei HANYusheng YANGYanlu XU
Dy(Ⅲ)离子在LiCl-KCl熔盐中的电化学行为及Dy-Ni金属间化合物的选择性制备(英文)被引量:8
2015年
采用循环伏安、方波伏安和开路计时电位等电化学方法研究了Dy(III)离子在Li Cl-KCl共晶盐中的电化学行为及Dy-Ni合金形成的电化学机理.循环伏安和方波伏安法研究表明,Dy(III)离子的电化学还原过程为三个电子转移的一步反应.与惰性W电极相比,Dy(III)离子在Ni电极上的循环伏安曲线多出了三对氧化还原峰,是由于Dy与Ni形成了合金化合物,导致Dy(III)离子在活性Ni电极发生了欠电位沉积.采用X射线衍射(XRD)和扫描电子显微镜(SEM)附带能量散射谱(EDS)对恒电位(-1.6,-1.8和-2.0 V)电解制备的Dy-Ni合金进行分析,分别获得了DyNi_5,Dy_2Ni_7和DyNi_2金属间化合物.实验结果表明,通过控制电位进行恒电位电解可以有选择性地制备不同的金属间化合物.
李梅孙婷婷刘斌韩伟孙扬张密林
关键词:电化学行为镍电极
在LiCl-KCl共晶熔体中电化学制备钬镍金属间化合物(英文)被引量:2
2015年
采用循环伏安、方波伏安和开路计时电位等方法研究了Ho(Ⅲ)离子在LiCl-KCl共晶熔体中的电化学行为及Ho-Ni合金化机理。在惰性W电极上,Ho(Ⅲ)离子在-2.06 V(vs Ag/Ag Cl)发生电化学还原,该还原过程为3个电子转移的一步反应。与惰性W电极上的循环伏安相比,Ho(Ⅲ)离子在活性Ni电极的循环伏安曲线上还出现了3对氧化还原峰,是Ho与Ni形成了金属间化合物,导致了Ho(Ⅲ)离子在活性Ni电极发生了欠电位沉积。在不同的电位进行恒电位电解制备的3个不同的Ho-Ni合金,采用X-射线衍射(XRD)和扫描电子显微镜-能谱仪(SEM-EDS)等测试手段进行表征,结果表明:制备的3种合金分别是Ho2Ni17,Ho Ni5和Ho Ni23种合金化合物。
李梅孙婷婷韩伟王珊珊张密林颜永得张萌
关键词:电化学行为镍电极
Electrodeposition of quarternary Mg-Zn-Li-Ca alloys from molten salts被引量:1
2013年
Direct electrodeposition of quarternary Mg-Zn-Li-Ca alloys on a molybdenum electrode from LiCl-KCl-MgCl2-ZnCl2-CaCl2 melts at 943 K was investigated.Cyclic voltammograms(CVs) show that the deposition potential of Li shifts in a positive direction after adding MgCl2,ZnCl2 and CaCl2.Chronopotentiometric measurements indicate that the codepositon of Mg,Li,Zn,and Ca occurs at current densities lower than-1.55 A/cm2.X-ray diffraction(XRD) indicates that Mg-Zn-Li-Ca alloys with different phases were prepared via galvanostatic electrolysis.The microstructures of typical phase of Mg-Zn-Li-Ca alloys were characterized by optical microscopy(OM) and scanning electron microscopy(SEM).The analysis of energy dispersive spectrometry(EDS) shows that elements of Mg and Ca distribute homogeneously in the Mg-Zn-Li-Ca alloy.However,element Zn mainly locates at the edges of the domain.
曹鹏张密林韩伟颜永得陈丽军
关键词:ELECTROLYSIS
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