SOLIDIFICATION OF MOLTEN TIN DROP ON A NICKEL SUBSTRATE

1994 ◽  
Author(s):  
T. Loulou ◽  
E.A. Artyukhin ◽  
Jean Pierre Bardon
Keyword(s):  
Nickel Substrate

Thin Pyrolytic Graphite Films for Electron Microscope Substrates

1971 ◽  
Vol 29 ◽  
pp. 226-227 ◽  
Author(s):  
George H. N. Riddle ◽  
Benjamin M. Siegel
Keyword(s):  
Vacuum Chamber ◽  
Pyrolytic Graphite ◽  
High Vacuum ◽  
Dark Field ◽  
Ultra High Vacuum ◽  
Graphite Substrate ◽  
Nickel Substrate ◽  
Routine Procedure ◽  
Field Electron Microscopy ◽  
Dark Field Electron

A routine procedure for growing very thin graphite substrate films has been developed. The films are grown pyrolytically in an ultra-high vacuum chamber by exposing (111) epitaxial nickel films to carbon monoxide gas. The nickel serves as a catalyst for the disproportionation of CO through the reaction 2C0 → C + CO2. The nickel catalyst is prepared by evaporation onto artificial mica at 400°C and annealing for 1/2 hour at 600°C in vacuum. Exposure of the annealed nickel to 1 torr CO for 3 hours at 500°C results in the growth of very thin continuous graphite films. The graphite is stripped from its nickel substrate in acid and mounted on holey formvar support films for use as specimen substrates.The graphite films, self-supporting over formvar holes up to five microns in diameter, have been studied by bright and dark field electron microscopy, by electron diffraction, and have been shadowed to reveal their topography and thickness. The films consist of individual crystallites typically a micron across with their basal planes parallel to the surface but oriented in different, apparently random directions about the normal to the basal plane.

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.

Electrodeposition of Ni-Mo Defect-Free Alloy from Ammonium-Citrate Electrolyte in Pulse Current Mode

MRS Advances ◽  
2017 ◽  
Vol 2 (58-59) ◽  
pp. 3585-3589
Author(s):  
Sergey M. Karabanov ◽  
Yulia M. Stryuchkova ◽  
Dmitriy V. Suvorov ◽  
Gennadiy P. Gololobov ◽  
Dmitry Yu. Tarabrin ◽  
...  
Keyword(s):  
Pulse Current ◽  
Current Mode ◽  
Density Variation ◽  
Pulse Mode ◽  
Ammonium Citrate ◽  
Molybdenum Alloy ◽  
Nickel Substrate ◽  
Sem Images ◽  
Citrate Electrolyte ◽  
Electrolysis Mode

ABSTRACT Electrodeposition in pulse current mode of nickel-molybdenum alloy on a nickel substrate was studied. The range of current density variation from 2 to 9 A/dm2 was investigated. The range of pulse and pause step lengths is from tens to hundreds of milliseconds. SEM-images of applied coatings surfaces are obtained. The method of energy dispersive spectroscopy determined that the molybdenum content in the coating is 21-24 wt%. It was found that under transient pulse mode of electrolysis, with the pulse step corresponding to hundreds of milliseconds, the most rigid and smooth coatings of the electrolytic nickel-molybdenum alloy are obtained from ammonium-citrate electrolyte. It is shown that the percentage of nickel in the alloy does not depend on the electrolysis mode.

scholarly journals The influence of ultrasound on nucleation in electrodeposition of lead dioxide on a nickel substrate

2021 ◽  
Vol 21 (2) ◽  
pp. 108-113
Author(s):  
Vasiliy A. Korotkov ◽  
◽  
Varvara I. Shpekina ◽  
Nina D. Solovyova ◽  
◽  
...  
Keyword(s):  
Lead Dioxide ◽  
Ultrasonic Field ◽  
Electrochemical Characteristics ◽  
Nickel Substrate ◽  
Power Sources

The effect of ultrasound on the electrodeposition of lead dioxide from lead (II) nitrate on a nickel substrate was studied. It was shown that the highest electrochemical characteristics are observed for the prototypes of backup power sources based on the Pb/HClO4/PbO2 system, in which lead dioxide obtained by electrodeposition under the influence of an ultrasonic field on a nickel substrate was used.

Graphene Converted from the Photoresist Material on Polycrystalline Nickel Substrate

2012 ◽  
Vol 51 ◽  
pp. 06FD17 ◽  
Author(s):  
Hyonik Lee ◽  
Seulah Lee ◽  
Juree Hong ◽  
Sang Geun Lee ◽  
Jae-Hong Lee ◽  
...  
Keyword(s):  
Nickel Substrate ◽  
Polycrystalline Nickel
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