METAL HYDRIDE ALLOYS FOR ELECTROCHEMICAL ENERGY SOURCE APPLICATIONS

2007 ◽  
Vol 1042 ◽  
Author(s):  
Stoyan Todorov Bliznakov ◽  
Nikolay G Dimitrov ◽  
Tony Spassov ◽  
Alexander Popov
Keyword(s):  
Metal Hydride ◽  
High Frequency ◽  
Amorphous Alloys ◽  
High Capacity ◽  
High Energy ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Al Content ◽  
Energy Ball ◽  
Metal Hydride Alloys

AbstractHigh-capacity conventional and advanced multicomponent metal hydride alloys were synthesized in this work by two different methods. A set of AB5–type intermetallic compounds, with different Al content, were produced by high-frequency vacuum induction melting method, while AB, A2B and mixed (AB5+Mg)-types composite nanocrystalline-amorphous alloys were obtained mechanochemically by high-energy ball milling in a planetary type mill. The alloys were characterized physically by XRD, SEM and thermodynamically by van't Hoff's plots derived from experimentally obtained PCT isotherms at various temperatures. Different optimized techniques for model electrode preparation from selected metal hydride alloys were also applied. The electrodes were charged-discharged electrochemically in concentrated alkaline solution. In this paper we compare the values for the electrochemical maximum capacity and cycle-life performance of the electrodes prepared by the investigated types of alloys.

scholarly journals Mechanochemical Synthesis and Rapid Consolidation of Nanocrystalline 3NiAl-Al2O3Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
In-Jin Shon ◽  
In-Yong Ko ◽  
Seung-Hoon Jo ◽  
Jung-Mann Doh ◽  
Jin-Kook Yoon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Mechanochemical Synthesis ◽  
High Frequency ◽  
Nanocrystalline Materials ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
Reinforced Composite ◽  
Energy Ball ◽  
High Frequency Induction

Nanopowders of 3NiAl and Al2O3were synthesized from 3NiO and 5Al powders by high-energy ball milling. Nanocrystalline Al2O3reinforced composite was consolidated by high-frequency induction-heated sintering within 3 minutes from mechanochemically synthesized powders of Al2O3and 3NiAl. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition grain growth. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. The relative density of the composite was 97%. The average Vickers hardness and fracture toughness values obtained were 804 kg/mm2and 7.5 MPa⋅m1/2, respectively.

BULK AMORPHOUS AND NANOSTRUCTURED MATERIALS BY HIGH ENERGY BALL MILLING

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2905-2913 ◽  
Author(s):  
CONSTANTIN POLITIS
Keyword(s):  
Ball Milling ◽  
Nanostructured Materials ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Glassy State ◽  
High Strength ◽  
Supercooled Liquid ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Mechanical alloying by high energy ball milling is a promising method for the production of bulk metallic glasses, amorphous alloys and nanostructured materials. Amorphous alloys reinforced by nanocrystals represent a big step in the optimization of new ultra high strength materials. Nano-scale W-Y solid solutions were synthesized by high energy ball milling. Only 1 at. % oxygen can stabilize the bulk metallic glassy state of Zr 54 Cu 19 Ni 8 Al 8 Si 5 Ti 5 O 1 to higher T x and to large supercooled liquid range Δ T xg .

Research on XX Fe Based Alloy Prepared by Air Induction Melting

2013 ◽  
Vol 664 ◽  
pp. 473-476 ◽  
Author(s):  
Xiao Li Zhang ◽  
Ai Fen Xu ◽  
Xiao Fan Chen ◽  
Ruo Lei Li ◽  
Chun Yan Yang
Keyword(s):  
Electron Microscope ◽  
Amorphous Alloys ◽  
Production Cost ◽  
Optical Microscope ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Technical Feasibility ◽  
The Cost ◽  
Very High ◽  
Scanning Electron

The production cost of amorphous alloys by vacuum induction melting (VIM) was very high. In order to reduce the cost, in this paper, alloys were prepared in alkaline crucible protected with different slags by Air induction melting (AIM). The comparison was found out between VTM and ATM in the research by using optical microscope (OM), scanning electron microscope (SEM), EDS, etc. Experimental results showed that Fe-Si-B alloys can be prepared by AIM with economic and technical feasibility.

SnSb/TiO2/C nanocomposite fabricated by high energy ball milling for high-performance lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32462-32466 ◽  
Author(s):  
Haihua Zhao ◽  
Wen Qi ◽  
Xuan Li ◽  
Hong Zeng ◽  
Ying Wu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Ball Milling ◽  
High Performance ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Li Ion Batteries ◽  
Energy Ball ◽  
Li Ion

Alloy anodes for Li-ion batteries (LIBs) have attracted great interest due to their high capacity.

Preparation of High Performance Silicon/Carbon Anode Materials for Lithium Ion Battery by High Energy Ball Milling

2012 ◽  
Vol 602-604 ◽  
pp. 1050-1053
Author(s):  
Ling Long Kong ◽  
Jie Zhao ◽  
Zhi Yuan Wang ◽  
Lei Li ◽  
Ning Xu ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Ball Milling ◽  
Anode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Carbon Anode ◽  
Silicon Carbon ◽  
Energy Ball

Silicon/carbon anode materials of different proportions for lithium ion battery were prepared by high energy ball milling. The composites were characterized using X-ray diffraction (XRD), and scanning electron microscope (SEM). The electrochemical performance of the composites was tested by means of galvanostatic testing system. The results indicated that the initial reversible capacity reached to 2162 mAh•g-1, which was much larger than the theoretical capacity of carbon negative materials at the ratio of 6:4 (Si: C). The capacity maintained to 1042 mAh•g-1 after 50 cycles. High capacity and good cycle property of the Si/C composites revealed that they were potential to take the place of the traditional carbon anode materials.

High Frequency Electrical and Magnetic Properties of Al/Epoxy Composites Prepared by Insulation Coating Process

2017 ◽  
Vol 898 ◽  
pp. 1770-1775 ◽  
Author(s):  
Yun Peng Qu ◽  
Pei Tao Xie ◽  
Yao Liu ◽  
Yong Wang ◽  
Run Hua Fan ◽  
...  
Keyword(s):  
High Frequency ◽  
Ac Conductivity ◽  
High Energy ◽  
Epoxy Composites ◽  
Coating Process ◽  
The Real ◽  
Al Content ◽  
Electrical And Magnetic Properties ◽  
Insulation Coating ◽  
Conduction Behavior

Al/Epoxy composites with different Al content were prepared by insulation coating process including high energy ball milling and hot press. The electrical properties and magnetic performance including ac conductivity, permittivity, reactance and permeability were investigated in detail. The frequency dispersions of ac conductivity followed the power law, indicating the hopping conduction behavior. The real part of permittivity for composites increased with higher Al content, which was attributed to the more interface between Al and epoxy. Besides, the real part of the relative permeability decreased with higher Al content in high frequency.

Mechanochemical Synthesis and Rapid Consolidation of Nanostructured Nb–ZrO2 Composite

2020 ◽  
Vol 20 (7) ◽  
pp. 4253-4256
Author(s):  
Seong-Eun Kim ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Frequency ◽  
Ball Mill ◽  
High Energy ◽  
Molar Ratio ◽  
Replacement Reaction ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
High Frequency Induction

Nb2O5 and Zr powders at a molar ratio of 1:2.5 were milled using a high-energy ball mill. The mixture powders produced Nb and ZrO2 nanopowders through a solid replacement reaction (Nb2O5+ 2.5Zr 2Nb + 2.5ZrO2). The synthesized nanopowders were consolidated via high-frequency induction heated sintering (HFIHS) within two min. The mechanical properties (hardness and fracture toughness) of nanostructured 2Nb–2.5ZrO2 composite were then evaluated. Both the hardness and fracture toughness of the 2Nb–2.5ZrO2 composite were higher than those of monolithic ZrO2.

High-frequency induction heated sintering of High-energy ball milled TiC0.5N0.5 powders and mechanical properties of the sintered products

2013 ◽  
Vol 39 (1) ◽  
pp. 585-591 ◽  
Author(s):  
Wonbaek Kim ◽  
Chang-Yul Suh ◽  
Ki-Min Roh ◽  
Jae-Won Lim ◽  
Sujeong Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
High Energy ◽  
Energy Ball ◽  
High Frequency Induction

Crystallisation and polymorphic transformations in Fe–Zr amorphous alloys obtained by high-energy ball milling

2004 ◽  
Vol 350 (1-3) ◽  
pp. E1075-E1077 ◽  
Author(s):  
P Gorria ◽  
J.S Garitaonandia ◽  
R Pizarro ◽  
D Martı́nez-Blanco ◽  
J Campo ◽  
...  
Keyword(s):  
Ball Milling ◽  
Amorphous Alloys ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Polymorphic Transformations ◽  
Energy Ball
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