Electrochemical processes during plating Fe powder particles by Ni and Ni/Cu coating in the fluidized bed

2001 ◽  
Vol 5 (7-8) ◽  
pp. 502-506 ◽  
Author(s):  
Andrea Turonová ◽  
Miriam Gálová ◽  
Ladislav Lux ◽  
Miroslav Gál
Keyword(s):  
Fluidized Bed ◽  
Electrochemical Processes ◽  
Fe Powder ◽  
Powder Particles

scholarly journals Densification Behaviour in the Fabrication of Al-Fe Metal Matrix Composite Using Powder Metallurgy Route

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Siddhartha Tiwari ◽  
Priyanka Rajput ◽  
Sanjay Srivastava
Keyword(s):  
Powder Metallurgy ◽  
Metal Matrix ◽  
Sintered Density ◽  
Multicomponent System ◽  
Rate Of Change ◽  
Green Density ◽  
Densification Behaviour ◽  
Fe Powder ◽  
Powder Particles ◽  
Powder Metallurgy Route

Densification behaviour of the powder particles in two- and/or multicomponent system is unpredictable. The present work deals with the densification behaviour of Al-Fe powder particles during compaction and sintering in order to fabricate the Al-Fe metal matrix composites by powder metallurgy route. Green compacts of Al-6.23 wt.% Fe powder particles were fabricated under varying compaction pressures, and these fabricated green compacts were sintered over a series of temperatures (430°C–590°C). The sintered products have been characterised with the help of X-ray diffraction (XRD) and scanning electron microscope attached with energy dispersive spectroscopy (EDS). It has been found that the green density of the compacts increases with increase in compaction pressure. The rate of change in green density is found to be lower at higher compaction pressures. Sintered density increases with increasing sintering temperature up to 550°C whereas a drop in sintered density is perceived at 590°C. This decrease in sintered density is considered to occur due to swelling which has been explained on the basis of the Kirkendall effect. The XRD and EDS analyses of sintered products indicated the presence of Al and Fe particles with the trace amount of intermetallics.

Impedance study of Ni–Co electro-deposition on Fe powder particles in fluidised bed systems

2005 ◽  
Vol 10 (7) ◽  
pp. 458-464 ◽  
Author(s):  
Renáta Oriňáková ◽  
Hans-Dieter Wiemhöfer ◽  
Jürgen Paulsdorf ◽  
Veronika Barinková ◽  
Anna Bednáriková ◽  
...  
Keyword(s):  
Fluidised Bed ◽  
Electro Deposition ◽  
Impedance Study ◽  
Fe Powder ◽  
Powder Particles

Particle Size Distribution and Structural State Analysis of Mechanically Milled Strontium Hexaferrite

2019 ◽  
Vol 946 ◽  
pp. 293-297 ◽  
Author(s):  
Ivan N. Egorov ◽  
Svetlana I. Egorova ◽  
Viktor P. Kryzhanovsky
Keyword(s):  
Particle Size ◽  
Magnetic Fields ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Milling Process ◽  
Strontium Hexaferrite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles

Article presents an experimental study result of milling coarse strontium hexaferrite in beater mill with formation of magneto fluidized bed and without it. Magneto fluidized bed is formed by mutually perpendicular constant and alternating gradient magnetic fields. We studied the dynamics of particle size distribution from milling time and parameters of magnetic fields. Microstructure dynamics of strontium hexaferrite powder particles milled in various regimes was studied by X-ray diffraction methods. Milling efficiency and energy efficiency of milling process were studied in conditions with and without powder fluidization by magnetic fields. Analysis of experimental data showed advantages of milling in magneto fluidized bed in increased efficiency, particle size distribution homogeneity and powder chemical activity because of lattice micro-stresses.

The study of Ni–Co alloy deposition on iron powder particles in a fluidized bed from sulphate bath

2005 ◽  
Vol 10 (7) ◽  
pp. 423-429 ◽  
Author(s):  
R. Rozik ◽  
R. Oriňàková ◽  
K. Markušová ◽  
L. Trnková
Keyword(s):  
Fluidized Bed ◽  
Iron Powder ◽  
Alloy Deposition ◽  
Powder Particles ◽  
Sulphate Bath

Distribution of charge in the process of coating Fe powder by electrolysis in a fluidized bed

1998 ◽  
Vol 2 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Miriam Gálová ◽  
Renata Oriňáková ◽  
Ladislav Lux
Keyword(s):  
Fluidized Bed ◽  
Fe Powder

TiO2 Coating onto Fe Powders via Fluidized Bed CVD

2011 ◽  
Vol 495 ◽  
pp. 138-141
Author(s):  
Ioannis Kartswnakis ◽  
Nikolaos Papadopoulos ◽  
Chaido Karayianni
Keyword(s):  
Thin Films ◽  
Fluidized Bed ◽  
Titanium Tetrachloride ◽  
Research Work ◽  
Magnetic Behavior ◽  
Optimum Conditions ◽  
Iron Particles ◽  
High Quality ◽  
Fe Powder

The present research work describes deposition of titania onto Fe powder using a homemade fluidized bed CVD reactor and titanium tetrachloride as the precursor. The as-deposited particles were examined in terms of microstructure and magnetic behavior by means of SEM, XRD, FTIR and VSM. It was realized that high quality TiO2deposition onto iron particles was possible. The produced thin films were microcrystalline and homogenous, with the optimum conditions being in the range of 800-900OC and a TiCl4:air ratio equal to 1:15-1:25.

scholarly journals Effect of Magnesium Addition and High Energy Processing on the Degradation Behavior of Iron Powder in Modified Hanks’ Solution for Bioabsorbable Implant Applications

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 78
Author(s):  
Rafael G. Estrada ◽  
Marta Multigner ◽  
Marcela Lieblich ◽  
Santiago Fajardo ◽  
Joaquín Rams
Keyword(s):  
Degradation Rate ◽  
Degradation Products ◽  
High Energy ◽  
Structural Features ◽  
Degradation Behavior ◽  
Medical Implants ◽  
Fe Powder ◽  
Energy Processing ◽  
Powder Particles ◽  
Phase Quantification

This paper shows the results of applying a combination of high energy processing and magnesium (Mg) as an alloying element in a strategy for enhancing the degradation rate of iron (Fe) for applications in the field of non-permanent medical implants. For this purpose, Fe powder was milled with 5 wt% of Mg (Fe5Mg) and its microstructure and characterized degradation behavior. As-received Fe powder was also milled in order to distinguish between the effects due to high energy processing from those due to the presence of Mg. The powders were prepared by high energy planetary ball milling for 16 h. The results show that the initial crystallite size diminishes from >150 nm to 16 nm for Fe and 46 nm for Fe5Mg. Static degradation tests of loose powder particles were performed in Hanks’ solution. Visual inspection of the immersed powders and the X-ray diffraction (XRD) phase quantification indicate that Fe5Mg exhibited the highest degradation rate followed by milled Fe and as received Fe, in this order. The analysis of degradation products of Fe5Mg showed that they consist on magnesium ferrite and pyroaurite, which are known to present good biocompatibility and low toxicity. Differences in structural features and degradation behaviors of milled Fe and milled Fe5Mg suggest the effective dissolution of Mg in the Fe lattice. Based on the obtained results, it can be said that Fe5Mg powder would be a suitable candidate for non-permanent medical implants with a higher degradation rate than Fe.

On the Origin of the Microscystalline Structure in Rapidly Solidified IN-100 Powder

1977 ◽  
Vol 35 ◽  
pp. 260-261
Author(s):  
J. M. Walsh ◽  
K. P. Gumz ◽  
J. C. Whittles ◽  
B. H. Kear
Keyword(s):  
The Other ◽  
Coarse Grained ◽  
Microcrystalline Structure ◽  
Routine Examination ◽  
Atomization Process ◽  
Centrifugal Atomization ◽  
Splat Quenching ◽  
Powder Particles ◽  
Dendritic Microstructures ◽  
Rapidly Solidified

During a routine examination of the microstructure of rapidly solidified IN-100 powder, produced by a newly-developed centrifugal atomization process1, essentially two distinct types of microstructure were identified. When a high melt superheat is maintained during atomization, the powder particles are predominantly coarse-grained, equiaxed or columnar, with distinctly dendritic microstructures, Figs, la and 4a. On the other hand, when the melt superheat is reduced by increasing the heat flow to the disc of the rotary atomizer, the powder particles are predominantly microcrystalline in character, with typically one dendrite per grain, Figs, lb and 4b. In what follows, evidence is presented that strongly supports the view that the unusual microcrystalline structure has its origin in dendrite erosion occurring in a 'mushy zone' of dynamic solidification on the disc of the rotary atomizer.The critical observations were made on atomized material that had undergone 'splat-quenching' on previously solidified, chilled substrate particles.

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

Shock consolidation of Ni-Ti alloy powder

1986 ◽  
Vol 44 ◽  
pp. 430-431
Author(s):  
Naresh N. Thadhani ◽  
Thad Vreeland ◽  
Thomas J. Ahrens
Keyword(s):  
Alloy Powder ◽  
Amorphous Material ◽  
Ti Alloy ◽  
Two Phase ◽  
Near Surface ◽  
Optical Micrograph ◽  
Shock Compaction ◽  
Powder Particles ◽  
Ti Powder ◽  
Rapidly Solidified

A spherically-shaped, microcrystalline Ni-Ti alloy powder having fairly nonhomogeneous particle size distribution and chemical composition was consolidated with shock input energy of 316 kJ/kg. In the process of consolidation, shock energy is preferentially input at particle surfaces, resulting in melting of near-surface material and interparticle welding. The Ni-Ti powder particles were 2-60 μm in diameter (Fig. 1). About 30-40% of the powder particles were Ni-65wt% and balance were Ni-45wt%Ti (estimated by EMPA).Upon shock compaction, the two phase Ni-Ti powder particles were bonded together by the interparticle melt which rapidly solidified, usually to amorphous material. Fig. 2 is an optical micrograph (in plane of shock) of the consolidated Ni-Ti alloy powder, showing the particles with different etching contrast.

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