Structure and Magnetic Properties of MnAl/α-Fe Nano-Composite Powders Prepared by High-Energy Ball Milling

2011 ◽  
Vol 287-290 ◽  
pp. 1492-1495 ◽  
Author(s):  
Hai Xia Wang ◽  
Ping Zhan Si ◽  
Wei Jiang ◽  
Jin Jun Liu ◽  
Jung Goo Lee ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
Elevated Temperatures ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Composite Powders ◽  
Two Phase ◽  
Nano Composite ◽  
Β Phase ◽  
Energy Ball

Novel nano-composite powders composed of hard-magnetic Mn54Al46 and soft-magnetic α-Fe were prepared by high-energy ball milling. The effect of α-Fe and preparation conditions on the structure and magnetic properties of the composite powders has been investigated. The ε-MnAl transforms to γ-MnAl, τ-MnAl, and β-phase under ball milling and annealing. The saturation magnetization and coercivity of the two-phase samples decrease with increasing temperature for the τ-phase decomposes at elevated temperatures. With increasing iron content, the coercivity decrease first and then increase up to 0.33 T when the Fe content is 10 wt%. Further addition of the magnetically soft iron phase would result in a decrease of the coercivity.

scholarly journals Magnetic properties and crystal structure of elemental cobalt powder modified by high-energy ball milling

2019 ◽  
Vol 8 (5) ◽  
pp. 4995-5003 ◽  
Author(s):  
J.A. Betancourt-Cantera ◽  
F. Sánchez-De Jesús ◽  
A.M. Bolarín-Miró ◽  
G. Torres-Villaseñor ◽  
L.G. Betancourt-Cantera
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Cobalt Powder ◽  
Energy Ball

scholarly journals Magnetic properties of iron nitride-alumina nanocomposite materials prepared by high-energy ball milling

2003 ◽  
Vol 24 (1-3) ◽  
pp. 93-96 ◽  
Author(s):  
S. R. Mishra ◽  
G. J. Long ◽  
F. Grandjean ◽  
R. P. Hermann ◽  
S. Roy ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
High Energy ◽  
Nanocomposite Materials ◽  
High Energy Ball Milling ◽  
Iron Nitride ◽  
Energy Ball

Physical and Electrochemical Properties of SiOx /C Composites Prepared by a Combination of Spray Pyrolysis and High Energy Ball Milling

2015 ◽  
Vol 1775 ◽  
pp. 7-12 ◽  
Author(s):  
Anara Molkenova ◽  
Izumi Taniguchi
Keyword(s):  
Electrochemical Properties ◽  
Spray Pyrolysis ◽  
Ball Milling ◽  
Ultrasonic Spray Pyrolysis ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Potential Range ◽  
Composite Powders ◽  
Ultrasonic Spray ◽  
Energy Ball

ABSTRACTSpray pyrolysis has been widely used to prepare homogeneous and uniform ceramic powders with high purity. In this study, we are proposing ultrasonic spray pyrolysis followed by heat treatment to produce SiOx/C composite powders, where sucrose was used as a carbon source. Furthermore, high energy ball milling of the as-prepared powders in the presence of acetylene black was conducted to activate its electrochemical properties by reducing the particle size and improving the functionalization of the SiOx composite particles. SiOx/C nanocomposite finally obtained at a sucrous concentration of 0.1 mol L-1 showed superior electrochemical properties, and the SiOx/C nanocomposite electrode delivered the first discharge and charge capacities of 1252 and 819 mAh g-1, respectively, with an initial columbic efficiency of 65% at a current density of 50 mAh g-1 in the potential range from 0.01 to 3 V versus Li/Li+.

Development of Ni/h-BN Self-Lubricating Composite Powder by High-Energy Ball Milling

2016 ◽  
Vol 869 ◽  
pp. 277-282
Author(s):  
Moisés Luiz Parucker ◽  
César Edil da Costa ◽  
Viviane Lilian Soethe
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
Solid Lubricants ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Second Phase ◽  
Average Particle ◽  
Composite Powders ◽  
The Matrix ◽  
Energy Ball

Solid lubricants have had good acceptance when used in problem areas where the conventional lubricants cannot be applied: under extreme temperatures, high charges and in chemically reactive environments. In case of materials manufactured by powder metallurgy, particles of solid lubricants powders can be easily incorporated to the matrix volume at the mixing stage. In operation, this kind of material provides a thin layer of lubricant that prevents direct contact between the surfaces. The present study aimed at incorporating particles of second phase lubricant (h-BN) into a matrix of nickel by high-energy ball milling in order to obtain a self-lubricating composite with homogeneous phase distribution of lubricant in the matrix. Mixtures with 10 vol.% of h-BN varying the milling time of 5, 10, 15 and 20 hours and their relationship ball/powder of 20:1 were performed. The effect of milling time on the morphology and microstructure of the powders was studied by X-ray diffraction, SEM and EDS. The composite powders showed reduction in average particle size with increasing milling time and the milling higher than 5 hours resulted in equiaxial particles and the formation of nickel boride.

Nanocrystalline Nd2Fe17synthesized by high-energy ball milling: crystal structure, microstructure and magnetic properties

2010 ◽  
Vol 22 (21) ◽  
pp. 216005 ◽  
Author(s):  
Pablo Álvarez ◽  
Pedro Gorria ◽  
Victorino Franco ◽  
Jorge Sánchez Marcos ◽  
María J Pérez ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Microstructure And Magnetic Properties

Al2O3-10 wt% Fe composite prepared by high energy ball milling: Structure and magnetic properties

2021 ◽  
Vol 47 (1) ◽  
pp. 984-991
Author(s):  
Rafael A. Raimundo ◽  
Rayanne S.S. Reinaldo ◽  
Nailton T. Câmara ◽  
Cleber S. Lourenço ◽  
Franciné A. Costa ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Effect of Ball Milling on Magnetic Properties of Nb Substituted R2Fe16Nb1 (R: Gd and Er) Alloys

2013 ◽  
Vol 1516 ◽  
pp. 227-231
Author(s):  
B. K. Rai ◽  
S. R. Mishra ◽  
S. Khanra ◽  
K. Ghosh
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Saturation Magnetization ◽  
Ball Milling ◽  
Grain Refinement ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Lattice Expansion ◽  
Energy Ball

AbstractIn this work, we report the effect of high energy ball milling (HEBM) on Nb doped R2Fe16Nb1 (R= Gd, Er) compounds. The focus of the work is to bring enhancement in magnetic properties of R2Fe17 (2:17) compounds with the ball milling. Specifically, we find that the ball milling increases saturation magnetization, coercivity, and Curie temperature. The increase in the magnetization and Curie temperature upon ball milling is related to the lattice expansion and microstrains while the increase in coercivity is related to the grain refinement.

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