scholarly journals Comparison between magnetic properties of CoFe2O4 and CoFe2O4/polypyrrole nanoparticles

2018 ◽  
Vol 58 (3) ◽  
Author(s):  
Kęstutis Mažeika ◽  
Violeta Bėčytė ◽  
Yulia O. Tykhonenko-Polishchuk ◽  
Mykola M. Kulyk ◽  
Oleksandr V. Yelenich ◽  
...  
Keyword(s):  
Ball Mill ◽  
High Energy ◽  
Composite Nanoparticles ◽  
Specific Loss Power ◽  
Transmission Electron ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Polypyrrole Nanoparticles ◽  
Polypyrrole Composite

CoFe2O4/polypyrrole composite nanoparticles were synthesized using a high energy ball mill. Mössbauer and Fourier transform infrared spectroscopies, magnetization measurements and transmission electron microscopy were used for the characterization of samples. Specific loss power (SLP) was determined by exposing nanoparticles to an alternating magnetic field. Some changes in coercivity were observed and explained comparing CoFe2O4 nanoparticles withCoFe2O4/polypyrrole composite nanoparticles.

Characterization of Al2O3NP–Al2024 and AgCNP–Al2024 composites prepared by mechanical processing in a high energy ball mill

2012 ◽  
Vol 536 ◽  
pp. S26-S30 ◽  
Author(s):  
C. Carreño-Gallardo ◽  
I. Estrada-Guel ◽  
M. Romero-Romo ◽  
R. Cruz-García ◽  
C. López-Meléndez ◽  
...  
Keyword(s):  
Ball Mill ◽  
High Energy ◽  
Mechanical Processing ◽  
High Energy Ball Mill ◽  
Energy Ball

Characterization of prealloyed copper powders treated in high energy ball mill

2006 ◽  
Vol 57 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Viseslava Rajkovic ◽  
Dusan Bozic ◽  
Milan T. Jovanovic
Keyword(s):  
Ball Mill ◽  
High Energy ◽  
Copper Powders ◽  
High Energy Ball Mill ◽  
Energy Ball

scholarly journals Characterization of AgcNP/Al2024 Composites Prepared by Mechanical Processing in a High Energy Ball Mill

2011 ◽  
Vol 17 (S2) ◽  
pp. 1430-1431
Author(s):  
C Carreño-Gallardo ◽  
I Estrada-Guel ◽  
M Neri-Flores ◽  
M Romero-Romo ◽  
C López-Meléndez ◽  
...  
Keyword(s):  
Ball Mill ◽  
High Energy ◽  
Mechanical Processing ◽  
High Energy Ball Mill ◽  
Energy Ball

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Synthesis and Characterization of Al7075, Al7075-10 Vol. % Al2O3 Composite Prepared by High-Energy Ball Milling

2014 ◽  
Vol 592-594 ◽  
pp. 755-759 ◽  
Author(s):  
C. Raja ◽  
R. Devi ◽  
S. Sivaprakash ◽  
V. Anandakrishnan
Keyword(s):  
Ball Mill ◽  
High Energy ◽  
Argon Atmosphere ◽  
Micro Hardness ◽  
High Energy Ball Mill ◽  
Hrtem Micrographs ◽  
Energy Ball ◽  
Uniaxial Compaction ◽  
Vickers Micro Hardness

Al7075 and Al2O3 powders were synthesized via high-energy ball mill for 15 h. Al7075 powders were mixed with 10 vol. % Al2O3, compacted by cold uniaxial compaction at 400 MPa. The green pellets were degassed at 350 oC for 30 min, and then sintered in the temperature of 600 oC under argon atmosphere for 120 min. It was shown that better density, vickers micro hardness and corrosion resistance were achieved due to refinement of grain size. HRTEM micrographs demonstrated a uniform distribution of Al2O3 particles in aluminium alloy and equilibrium η (MgZn2) precipitates along the grain boundaries.

A Study of Exchange-Coupling Effect on Nd2Fe14B / α-Fe Forming Core/Shell Shape

2007 ◽  
Vol 119 ◽  
pp. 147-150 ◽  
Author(s):  
Chang Woo Kim ◽  
Young Hwan Kim ◽  
Don Keun Lee ◽  
In Chul Jeong ◽  
Hae Woong Kwon ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Ball Mill ◽  
Coupling Effect ◽  
Chemical Reduction ◽  
High Energy ◽  
Shell Shape ◽  
Core Shell ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Mill Process

We report the core/shell type as the interesting one of the various techniques to prepare exchange-coupled permanent magnet. In this study, the exchange-coupled Nd2Fe14B/α-Fe was prepared by high energy ball mill process and chemical reduction. Nd15Fe77B8 powder prepared by high energy ball mill process was coated with α-Fe nanoparticle by chemical reduction. α-Fe nanoparticle on the ball milled Nd15Fe77B8 was synthesized by chemical reduction with borohydride as a reducing agent in aqueous solution. After annealing, Nd2Fe14B/α-Fe forming core/shell shape has exchange-coupling effect and was identified by using XRD, FE-SEM, VSM, TMA and EDX.

Technological Aspects of Fe-Al-Si Intermetallic Alloy Preparation by Mechanical Alloying

2019 ◽  
Vol 810 ◽  
pp. 101-106 ◽  
Author(s):  
Petr Haušild ◽  
Jaroslav Čech ◽  
Veronika Kadlecová ◽  
Miroslav Karlík ◽  
Filip Průša ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Ball Mill ◽  
High Energy ◽  
Intermetallic Alloy ◽  
Alloyed Powder ◽  
Temperature Oxidation ◽  
High Energy Ball Mill ◽  
Speed Up ◽  
Energy Ball ◽  
Kinetics Of

In this paper, recently developed ternary FeAl20Si20 (wt.%) alloy with promising high-temperature oxidation and wear resistance was prepared by mechanical alloying in a high-energy ball mill. The possibility to speed-up the mechanical alloying process by replacing aluminium (and partly silicon) elemental powder by the pre-alloyed powder (AlSi30) with relatively fine dispersion of Si in the Al-Si eutectic was examined. The microstructure, phase composition and mechanical properties after various time of mechanical alloying were characterized. The effect of using the pre-alloyed powders on kinetics of mechanical alloying is compared with the results obtained on batches prepared from elemental powders.

Synthesis of Al5083 Alloy by High Energy Ball Mill and Densification through Equal Channel Angular Pressing (ECAP)

2019 ◽  
Vol 969 ◽  
pp. 68-72
Author(s):  
K. Chandra Sekhar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Ball Mill ◽  
High Energy ◽  
Mechanically Alloyed ◽  
Channel Angle ◽  
Angular Pressing ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Scanning Electron

An attempt was made to synthesis Al-5083alloy through high energy ball milling and densification through ECAP. The elemental powders consisting of Al5083 was milled for 5, 10 and 15 hrs using Retsch high energy ball mill (PM400). The physical and structural properties of mechanically alloyed particulates were characterised by diffraction methods and electron microscopy. The 15hrs nanocrystalline structured particulates of Al5083 alloy shows crystallite size of 15nm. Scanning Electron Microscope (SEM) reveals the morphology of alloy which is irregular shaped. The size of alloyed particulates also measured using SEM and found to be 7μm for 15hrs of milling. The 15hr milled alloy particulates were densified by ECAP through 90o die channel angle. Maximum densification of 92% and highest hardness of 63HRB was achieved for sample consolidated with route-A for two passes along with sintering.

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