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Preparation of Nickel Powders by Reduction of Nickel Hydroxide Using the Taylor Fluid Flow

Park I.-J., Kim D.-W., Kim G.-H., Chae H.-J., Jung H.-C.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 3

1443--1447

In this study, Ni(OH)2 was synthesized by the continuous reaction by the Taylor fluid flow and compared with those prepared from the conventional batch type reaction. The nickel powders were synthesized by reduction of Ni(OH)2 in an aqueous solution with hydrazine hydrate acting as the reductant. And then the characteristics of the nickel powder according to the synthesis method were compared. The average particle size of the synthesized Ni(OH)2 using Taylor reactor was generally decreased about 1.5~2.5 times more than the batch reaction. The nickel powders prepared by the batch reaction highly agglomerated with non-uniform particles. In the Taylor reaction, the agglomeration of particles was broken and uniform nickel powder was produced.

The effect of fine metal alloy powders on rubbing steel surfaces

Zolotukhina L. V., Frishberg I. V., Kharlamov V. V., Zhidovinova S. V., Kishkoparov N. V., Dudko P. P., Kuzmin V. N.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

201-206

The paper discusses the mechanism, by which the antiwear oil additive "Rimet" and the multi-purpose grease (MG) "Vympel", both containing fine powders of metal alloys, act upon rubbing steel surfaces.

Particle velocity, pressure and flushing phenomenon of fine powders

Kuchii S., Tomita Y.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

109-114

When a load is applied to a free surface of cohesive fine powder in a vessel, the powder can spout from a small orifice, which we call the flushing. This phenomenon is explained by using a gas-solid two phase flow modeling in a view of effective stress and Darcy's law, and is verified experimentally and numerically for a case when the powder in a rectangular vessel spouts from a slit by a constant piston load. It is found that near the slit there appears a high-speed region of particle of which velocity is considerably larger than that of free following due to the gravity.