Concentration distribution in reduced iron-nickel powders

ABSTRACTSonoelectrochemistry, or pulsed electrodeposition at high current density in presence of high intensity ultrasound, is used to produce magnetic powders with a mean diameter in the range of 100 nm. Pure iron, cobalt and nickel powders are produced together with their binary and ternary alloys. The powders are crystalline and homogeneous as observed by scanning and transmission electron microscopy, electron diffraction and X-ray fluorescence. The compositions of the binary and ternary alloy powders reproduce strictly the iron, nickel and cobalt compositions of the starting electrolytes except for the nickel-cobalt alloys.

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Deposition of iron-nickel powders from simple electrolytes in a two-layer electrolytic bath

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf01117777 ◽

1976 ◽

Vol 15 (6) ◽

pp. 425-428

Author(s):

T. N. Amelichkina ◽

E. A. Serpuchenko ◽

O. D. Kurilenko

Keyword(s):

Electrolytic Bath ◽

Nickel Powders ◽

Iron Nickel

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Prealloyed Iron-Nickel Powders by an Amalgamation Process

Advances in X-ray Analysis ◽

10.1154/s0376030800002457 ◽

1963 ◽

Vol 7 ◽

pp. 117-125 ◽

Cited By ~ 1

Author(s):

R. J. Peavler ◽

N. I. Ananthanarayanan

Keyword(s):

Particle Size ◽

Solid State ◽

Room Temperature ◽

Dispersion Strengthening ◽

X Ray ◽

Nickel Powders ◽

Ultrafine Metal ◽

Iron Nickel ◽

Equilibrium Structures ◽

Alloy Systems

AbstractX-ray studies indicate that mixed iron and nickel “amalgams” are reactive even at room temperature. By distilling off the mercury from these amalgams at temperatures between 400 and 100°C, ultrafine iron-nickel alloy powders are readily obtained. X-ray studies show that these powders possess equilibrium structures corresponding to the temperature of preparation. Alloy powders belonging to many alloy systems and having controlled composition, purity, and particle size may be prepared by this process. One special use of the process is in the preparation of homogeneous alloy powders for studying solid state equilibria below 400°C, particularly in alloy systems with sluggish transformations, the process being invaluable in the temperature range between 200 and 100°C, Another is in the preparation of ultrafine metal and alloy powders with equally fine, if not finer, dispersions of other phases, suited for studying dispersion-strengthening. Both of these special uses are currently under investigation,

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Electrochemical Synthesis of Binary Carbides of Tungsten and Iron (Nickel, Cobalt) in Halide-Oxide Melts at 823 K

Zeitschrift für Naturforschung A ◽

10.1515/zna-2007-1213 ◽

2007 ◽

Vol 62 (12) ◽

pp. 749-753

Author(s):

Hasbi Kushkhov ◽

Marina Adamokova ◽

Vitalij Kvashin ◽

Anzor Kardanov ◽

Svetlana Gramoteeva

Keyword(s):

Acid Base ◽

Iron Carbides ◽

Pressing Method ◽

X Ray ◽

Nickel Powders ◽

Nickel Cobalt ◽

Cobalt Iron ◽

Iron Nickel ◽

Oxide Melts ◽

Cobalt And Nickel

Iron, cobalt and nickel powders are used as binding components for the production of articles of tungsten carbide by the hot pressing method. This fact and the unique properties of binary carbides of tungsten-iron triad metals encouraged the search for new ways of their synthesis. In the present work, the attempt to synthezise binary tungsten-nickel (cobalt, iron) carbides in molten KCl-NaCl-CsCl at 823 K was made. As a result of voltammetry research, it was established that in eutectic KCl-NaCl-CsCl melts the deposition potentials ofWand Ni (Co, Fe) differ by 150 - 350 mV from each other, which makes their co-deposition difficult. It is possible to shift the deposition potentials of tungsten and metals of the iron triad metals towards each other by changing the acid-base properties of the melt. The products of electrolysis in these molten system were identified by X-ray analysis. They are mixtures of tungsten and nickel (cobalt, iron) carbides: Ni2W4C, W6C2.54; Co3W3C, Co6W6C, W2C, Co3C; FeW3C.

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