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Grain boundary optimization induced substantial squareness enhancement and high performance in iron-rich Sm-Co-Fe-Cu-Zr magnets

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Journal of Materials Science & Technology 2021年第26期85卷 56-61页

作者： Jun Cao Tianli Zhang Jinghua Liu Hao Xu Mingyao Hu Wei Xia Ao Wang Hui Wang Chengbao Jiang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Increasing iron content has been witnessed an essential method to improve the remanence of 2:17-type Sm-Co-Fe-Cu-Zr magnets,however,the inferior squareness factor accompanied with the increased iron content turns into a neck sticking *** this work,the grain boundary optimization induced substantial squareness enhancement from 63.4%to 91.4%,and consequently an excellent maximum energy product of 32.63 MGOe have been achieved in iron-rich Sm-Co-Fe-Cu-Zr magnets via tuning solution *** is clearly revealed that the grain boundary(GB)phases as well as the micro-twins’density in grain interiors can be controlled and interprets the enhancement mechanism of squareness.

关键词： iron-rich Sm-Co-Fe-Cu-Zr magnet Grain boundary Squareness

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Research on rare earth and iron-rich diamond-enhanced tungsten carbide composite button

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Rare Metals 2004年第4期23卷 373-376,384页

作者： SHIXiaoliang SHAOGangqin DUANLongchen YUANRunzhang StateKeyLaboratoryofAdvancedTechnologyforMaterialsSynthesis＆Processing WuhanUniversityofTechnologyWuhan430070China EngineeringFaculty ChinaUniversityofGeosciencesWuhan430074China

At the present time in china, the binder used in tungsten carbide composite button is mainly cobalt, which is very expensive. In order to solve the problems, a new type of rare earth and iron-rich diamond-enhanced tungsten carbide with high abrasive resistance and high toughness against impact, which realizes to substitute ferrum for cobalt, has been developed. The key problems in making the button are to improve the mechanical properties of matrix and increase the welding strength between the diamond and the matrix. All these problems have been solved effectively by low temperature activation hot-press sintering, doping rare earth lanthanum in matrix and high sintering pressure. The properties of the button have been determined under laboratory conditions. The test results show that its hardness is more than 90 HRA, its abrasive resistance is 39 times more than that of conventional cemented tungsten carbide, and its toughness against impact is more than 200 J. All these data show the button has very good mechanical properties.

关键词： tungsten carbide composite button rare earth iron-rich

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Dynamic electromagnetic separation of iron-rich phase inclusions from Al alloy

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China Foundry 2006年第3期3卷 200-203页

作者： YU Hai-jun YAO Guang-chun LIU Yi-han Engineering Centre of Advanced Material Preparation Ministry of Education Institute of Material and Metallurgy Northeastern University Shenyang 110004 China

Electromagnetic separation of the iron-rich phase inclusions from Al alloy was investigated. The influencing parameters including magnetic induction density, the section shape of the separating channel and the length of influential loop of the metal melt on the separation efficiency of iron-rich phase inclusions were studied. The results show that when the proper magnetic induction density (B=0.3T) is applied, rectangle separating channel is used, and the influential loop of the metal melt is long, high separating efficiency of the iron-rich phase inclusions can be obtained.

关键词： iron-rich phase inclusion alloy electromagnetic separation

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Molten-salt synthesis of porous La0.6Sr0.4Co0.2Fe0.8O2.9 perovskite as an efficient electrocatalyst for oxygen evolution

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Nano Research 2018年第9期11卷 4796-4805页

作者： Sanzhao Song Jing Zhou Shuo Zhang Linjuan Zhang Jiong Li Yu Wang Ling Han Youwen Long Zhiwei Hu Jian-Oiang Wang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China Max Planck Institute for Chemical Physics of Solids Nothnitzer Strasse 40 Dresden 01187 Germany

The development of an efficient and low-cost electrocatalyst for the oxygen evolution reaction （OER） via an eco-efficient route is a desirable, although challenging, outcome for overall water splitting. Herein, an iron-rich La0.6Sr0.4Co0.2Fe0.8O2.9 （LSCF28） perovskite with an open porous topographic structure was developed as an electrocatalyst by a straightforward molten-salt synthesis approach. It was found that porosity correlates with both the iron content and the molten-salt approach. Benefiting from the large surface area, high activity of the porous internal surface, and the optimal electronic configuration of redox sites, this inexpensive material exhibits high performance with a large mass activity of 40.8A·g^-1 at a low overpotential of 0.345 V in 0.1 M KOH, surpassing the state-of-the-art precious metal IrO2 catalyst and other well-known perovskites, such as Ba0.5Sr0.5Co0.8Fe0.2O3 and SRCoO2.7. Our work illustrates that the molten- salt method is an effective route to generate porous structures in perovskite oxides, which is important for energy conversion and storage devices.

关键词： iron-rich perovskite oxygen evolution reaction energy storage and conversion molten salt

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