Methods of preparation and properties of nickel powder from powdered nickel oxide of cuban origin. II. Comminution of products during the reaction of reduction of nickel from its oxide

1989 ◽  
Vol 28 (2) ◽  
pp. 75-78
Author(s):  
Saez Carmen ◽  
I. V. Uvarova ◽  
M. P. Savyak ◽  
V. T. Bondar' ◽  
A. F. Khrienko
Keyword(s):  
Nickel Oxide ◽  
Nickel Powder ◽  
Powdered Nickel

scholarly journals Perspective nickel-oxide cathodes technologies for centimetric range microwave devices

2016 ◽  
Vol 11 (3) ◽  
pp. 74-81 ◽  
Author(s):  
N. E. Ledentsova ◽  
I. P. Li ◽  
V. S. Petrov ◽  
V. I. Kapustin
Keyword(s):  
Nickel Oxide ◽  
Nickel Powder ◽  
Wave Length ◽  
Active Agent ◽  
Centimetric Wave ◽  
Optimum Temperature ◽  
Optimum Pressure ◽  
Nickel Particles ◽  
Oxide Cathodes ◽  
Length Range

Three technologies of nickel-oxide cathodes based on nickel powder and on barium-calciumstrontium triple carbonate powder for microwave ovens of the centimetric wave length range devices are suggested. The optimum fraction of nickel powder for the production of cathodes is 45-71 microns. The optimum content of the triple carbonate is 10%. The optimum pressure of pressing is 7 t/cm2. The optimum temperature of agglomeration is 1100°C for 10 min. The quality improvement and yield of suitable cathodes are provided by the use of agglomerates of nickel and triple carbonates. The agglomerates contain nickel particles of the 10-25 microns fraction coated with the triple carbonate containing 50% of the carbonate and baked in dried hydrogen at 1000°C for 10 min. The formation of the cathode is carried out by mixing and agglomerating the 45-63 microns fraction and the nickel 45-71 microns fraction with the carbonates concentration 10%. In order to improve the cathodes quality it is expedient to anneal the agglomerates after their production in carbon dioxide at 200-300°C with a final purge by nitrogen at 1000°C for 10 minutes. The use of agglomerates based on nickel and the triple carbonate for the production of oxide-nickel cathodes provides more uniform distribution of the emission-active agent in the volume and on the surface of the cathodes.

The Microstructure of Nickel Oxide Scales

1981 ◽  
Vol 39 ◽  
pp. 86-87
Author(s):  
M. T. Tinker ◽  
L. W. Hobbs
Keyword(s):  
Electron Microscopy ◽  
Nickel Oxide ◽  
Ion Beam ◽  
Oxide Scales ◽  
Nickel Substrate ◽  
Outward Diffusion ◽  
Transmission Electron ◽  
Nickel Substrates ◽  
Nickel Base ◽  
Technological Interest

There is considerable technological interest in oxidation of nickel because of the importance of nickel-base superalloys in high-temperature oxidizing environments. NiO scales on nickel grow classically, by outward diffusion of nickel through the scale, and are among the most studied of oxidation systems. We report here the first extensive characterization by transmission electron microscopy of nickel oxide scales formed on bulk nickel substrates and sectioned both parallel and transversely to the Ni/NiO interface.Electrochemically-polished nickel sheet of 99.995% purity was oxidized at 1273 K in 0.1 MPa oxygen partial pressure for times between 5 s and 25 h. Parallel sections were produced using a combination of electropolishing of the nickel substrate and ion-beam thinning of the scale to any desired depth in the scale. Transverse sections were prepared by encasing stacked strips of oxidized nickel sheet in epoxy resin, sectioning transversely and ion-beam thinning until thin area spanning one or more interfaces was obtained.

HREM observation of NiO growth on submicron spheres of pure nickel

1989 ◽  
Vol 47 ◽  
pp. 548-549
Author(s):  
C.M. Teng ◽  
T.F. Kelly ◽  
J.P. Zhang ◽  
H.M. Lin ◽  
Y.W. Kim
Keyword(s):  
Nickel Oxide ◽  
Grain Boundaries ◽  
Pure Nickel ◽  
Submicron Particles ◽  
Crystal Formation ◽  
Nickel Wire ◽  
Liquid Droplets ◽  
Oxide Interface ◽  
Nickel Chromium ◽  
Chromium Alloys

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

Magnetocatalytic Effects and Electric Anomalies at the Néel Point of Nickel Oxide

1958 ◽  
Vol 16 (1_2) ◽  
pp. 101-125 ◽  
Author(s):  
Alessandro Cimino ◽  
Ettore Molinari ◽  
Giovanni Romeo
Keyword(s):  
Nickel Oxide

Synthesis, Characterization and d.c conductivity of Nano sized Nickel Oxide

2011 ◽  
Vol 3 (6) ◽  
pp. 60-61
Author(s):  
B. Govindaraj B. Govindaraj ◽  
◽  
Arunkumar Lagashetty ◽  
A. Venkataraman A. Venkataraman
Keyword(s):  
Nickel Oxide

Exploring the characteristics of the nickel oxide nanoparticles via Sol - gel method

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Jothi M ◽  
Sowmiya K
Keyword(s):  
Nickel Oxide ◽  
Ph Value ◽  
Lattice Structure ◽  
Sol Gel ◽  
Systematic Change ◽  
Average Crystalline Size ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy

Nickel Oxide (NiO) is an important transition metal oxide with cubic lattice structure. NiO is thermally stable that is suitable for tremendous applications in the field of optic, ceramic,glass, electro-chromic coatings, plastics, textiles, nanowires, nanofibers, electronics,energy technology, bio-medicine, magnetism and so on. In this present study, NiO nanoparticles were successfully synthesized by sol-gel technique. Nano-sols were prepared by dissolving Nickel-Chloride [NiCl2.6H2O] in NaOH solvent and were converted into nano structured gel on precipitation. A systematic change in preparation parameters like calcination temperature, time, pH value has been noticed in order to predict the influence on crystallite size. Then the prepared samples were characterized by the X-ray Diffraction Spectroscopic (XRD), UV-VIS Spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). From XRD, the average crystalline-size has been calculated by Debye-Scherrer Equation and it was found to be 12.17 nm and the band gap energy of Nickel oxide (NiO) from UV studies reveals around 3.85 eV. Further, EDX and FTIR studies, confirm the presences of NiO nanoparticles. The SEM study exhibits the spherical like morphology of Nickel oxide (NiO). Further from PSA, the mean value of NiO nanoparticles has been determined.

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