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Solid-state transformation in ball milled nickel powder

Sep 15, 2010 A solid-state tetragonal transformation of ball milled and cold pressed unmilled nickel powder is proposed. The phase evolution was characterized using the X-ray diffraction (XRD) technique, while the phase transition was analysed by the differential scanning calorimetry (DSC).

Hydrogen uptake of high-energy ball milled nickel

Jan 01, 2014 Milling was carried out in a high-energy ball mill (SPEX 8000 Mixer) for 8 h at room temperature. The ball to powder weight ratio was 10:1. The crystal structure of Nickel/carbon nanotube composites was examined using Rigaku D/MAX 2500 X-ray diffractometer (XRD) equipped with a Cu-Kα radiation source (λ = 0.15418 nm).

Solid-state transformation in ball milled nickel powder

A solid-state tetragonal transformation of ball milled and cold pressed unmilled nickel powder is proposed. The phase evolution was characterized using the X-ray diffraction (XRD) technique, while

Effects of ball milling on the physicochemical and

With the goal of combining the advantages of ball-milling and biochar technologies, a variety of ball-milled biochars (BM-biochars) were synthesized, characterized, and tested for nickel (Ni(II)) removal from aqueous solution.

Magnetic properties of ball milled nanocrystalilne Ni and

Jan 01, 1995 For nickel the appearance of the peak seems to be a more inherent property and interesting to mentioning that the peak is situated at the same d values where the sharp drop on the He vs. d curve appeared. The saturation magnetization of the ball milled Ni is considerably larger than for the bulk (100pm grain size) material, their ratio is 1.37.

Properties of Zr0.5Ti0.5(V0.25Mn0.15Ni0.6)2 alloy ball

Feb 15, 1997 Thus the ball-milled alloy and nickel is not simply a mixture of two metals, but a metastable system with high reactivity due to the large interface between the metals, the presence of defects, the dissolation of nickel in the alloy and the chemical interaction of the compounds. 3.3. Activation of the electrode The as-cast and ball-milled Zro

Dilatometry of Ball Milled Nickel Nano Powder during Non

This work attempts to evaluate the sintering mechanisms of ball milled nanocrystalline nickel during nonisothermal heating. Samples showed a sintered density of 91.2% (theoretical) and grain growth up to 414 nm at 1273K. The activation energies of 12.4, 32.0 and 51.6 kJ/mol were found for viscous flow, lattice diffusion and grain boundary

Performance improvement of pasted nickel electrodes with

Sep 15, 2006 Pasted nickel electrodes with an addition of ball-milled Ni(OH) 2 were prepared as follows: 8 wt.% Ni(OH) 2 powder ball-milled with 120 h was mixed thoroughly with 92 wt.% spherical Ni(OH) 2 powder as the active material, 10 wt.% nickel and 5 wt.% CoO powders were used as conductors, and 3 wt.% suspension containing 60 wt

Hydrogen storage characteristics of ball-milled magnesium

Jun 01, 1999 Magnesium-nickel alloys with about one percent nickel prepared by ball-milling yield the most significant improvements in hydrogen storage behavior relative to pure magnesium. Of potential hydrogen storage materials, pure magnesium would be best

Physically synthesized Ni-Cu nanoparticles for magnetic

May 08, 2004 Results. It was found that the desired alloy is composed of 71% nickel and 29% copper by weight. It was observed that the coarse sand-grinded powder has a Curie temperature of 345 K and the fine ball-milled powder shows a temperature of 319 K 320 K.

Effects of ball milling on the physical and

Abstract. Nickel hydroxide powder was modified by the method of ball milling, and the physical properties of both the ball-milled and un-milled nickel hydroxide were characterized by scanning electron microscopy, specific surface area, particle size distribution and X-ray diffraction.

Microstructural characterization of ball-milled metal

The ball milled nickel powders after 2 and 6 hours are shown in Figures 4(a) and (b). They exposed severe cold welding after 2 hours milling, leading to a considerable particle size increment. By increasing the milling time up to 6 hours, the particles were broken down into finer fragments, in contrast with Ti powders, in which the mean

Optimizing the production procedure of ball milled

It was established that Mg-10%Ni ball milled for 10hours, charged at a hydrogen pressure and temperature of 20 bar and at 300 °C respectively was the best sample in terms of the amount of hydrogen stored (≈ 5.6 weight percent) and the hydrogen

Corrosion Behaviour of Nickel Coating Obtained by Ball Milling

The objective of this study is to assess the corrosion behaviour of ball-milled nanocrystalline Ni coatings (12 H and 24 H duration) in 0.1M H2SO4 media. such as nano-crystalline nickel

Nickel phosphide: the effect of phosphorus content on

As the ball milling time increases to 9 hours, the average size of nickel phosphide reduces even further (1–2 μm) with again varied shapes of Ni 2 P powders. 9 hour ball milled Ni 2 P powder shows a very smooth surface morphology compared to that of either as-received or 6 h ball milled powders.

NASA TECHNICAL NOTE NASA D-

In addition, nickel powder was also ball milled in some of these organic liquids to compare the reaction behavior of this less reactive metal with that of chromium. In order to determine the nature of the reaction products, the three phases present in the ball mill (solid metal powder, milling liquid, and head space gases) were chemi­

(PDF) Effect of Ni content on the electrochemical

Anodic polarization curves for the ball-milled La2 Mg17−x Nix + Fig. 9. High-rate dischargeability as a function of exchange current density for 200 wt.% Ni (x = 0, 1, 3, 5) composite electrodes at full-charge state and 303 K. hydrogen evolution reaction at ball-milled La2 Mg17−x Nix + 200 wt.% Ni (x = 0, 1, 3, 5) composite electrodes.

Nanocrystalline Nickel Hydroxide in Pasted Nickel

The ball-milled nanocrystalline Ni(OH)2 was then used to alter the microstructure of pasted nickel electrodes and improve the distribution of the active material in the porous electrode substrate.

Hydrogen storage characteristics of ball-milled magnesium

Magnesium-nickel alloys with about one percent nickel prepared by ball-milling yield the most significant improvements in hydrogen storage behavior relative to pure magnesium. Of potential hydrogen storage materials, pure magnesium would be

Physically synthesized Ni-Cu nanoparticles for magnetic

Results. It was found that the desired alloy is composed of 71% nickel and 29% copper by weight. It was observed that the coarse sand-grinded powder has a Curie temperature of 345 K and the fine ball-milled powder shows a temperature of 319 K 320 K.

CO NASA

ball milled with either thoria or yttria dispersoid powders using water as the milling fluid and helium as a cover gas; samples of the milled powders were examined by elec- tron microscopy; and the amounts of dispersoid taken up by the milled nickel powder as

Ball-milled Ni-Mn-Zn hydroxide for alkaline secondary battery

Nickel hydroxide powder was modified by the method of ball milling, and the physical properties of both the ball-milled and un-milled nickel hydroxide were characterized by scanning electron

URL: aessweb THE EFFECTS OF NICKEL ADDITIONS

Ball milling (BM) of the powder was conducted in a planetary high-energy ball mill (Fritsch model Pulverisette 5) under argon atmosphere using stainless steel balls of 10 mm to 20 mm diameter. The balls/powder weight ratio achieved for nickel in the milled powders during this study. On mechanically alloying blended elemental powder mixtures

Ball milled cobalt oxyhydroxide coat on the surface of

Aug 29, 2009 Cobalt oxyhydroxide coat on the surface of nickel hydroxide particles is finished employing a simple ball milling process. The structure, morphology, and surface composition of the coated Ni(OH)2 particles is characterized by using X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy tests. The results show that numerous strip-like particles of a mixture

Optimizing the production procedure of ball milled

It was established that Mg-10%Ni ball milled for 10hours, charged at a hydrogen pressure and temperature of 20 bar and at 300 °C respectively was the best sample in terms of the amount of hydrogen stored (≈ 5.6 weight percent) and the hydrogen

URL: aessweb THE EFFECTS OF NICKEL ADDITIONS

Ball milling (BM) of the powder was conducted in a planetary high-energy ball mill (Fritsch model Pulverisette 5) under argon atmosphere using stainless steel balls of 10 mm to 20 mm diameter. The balls/powder weight ratio achieved for nickel in the milled powders during this study. On mechanically alloying blended elemental powder mixtures

CO NASA

ball milled with either thoria or yttria dispersoid powders using water as the milling fluid and helium as a cover gas; samples of the milled powders were examined by elec- tron microscopy; and the amounts of dispersoid taken up by the milled nickel powder as

NASA TECHNICAL NOTE NASA D-

In addition, nickel powder was also ball milled in some of these organic liquids to compare the reaction behavior of this less reactive metal with that of chromium. In order to determine the nature of the reaction products, the three phases present in the ball mill (solid metal powder, milling liquid, and head space gases) were chemi­

Nickel phosphide: the effect of phosphorus content on

As the ball milling time increases to 9 hours, the average size of nickel phosphide reduces even further (1–2 μm) with again varied shapes of Ni 2 P powders. 9 hour ball milled Ni 2 P powder shows a very smooth surface morphology compared to that of either as-received or 6 h ball milled powders.

Alkaline earth filled nickel skutterudite antimonide

Disclosed are methods for the manufacture of n-type and p-type filled skutterudite thermoelectric legs of an electrical contact. A first material of CoSi.sub.2 and a dopant are ball-milled to form a first powder which is thermo-mechanically processed with a second powder of n-type skutterudite to form a n-type skutterudite layer disposed between a first layer and a third layer of the doped

Preparation and Electrochemical Hydrogen Storage of the

The LaMg12-based nanocrystalline alloys were prepared by ball-milling as-cast LaMg12 alloy with Ni powders. The electrochemical charging and discharging in KOH solution of the ball-milled LaMg12-based nanocrystalline alloys succeeded due to the formation of the metallic Ni particles highly dispersed through nanocrystalline alloy matrix. The first discharge capacity of the ball-milling LaMg12

(PDF) Strength versus ductility in carbon nanotube

For CNT/Ni nanocomposite (ball milled), CNT/Ni nanocomposite powder is synthesized by mixing nickel powder and CNTs through high energy ball milling process for 24 h at 400 rpm. The volume fraction of CNTs in both the composite powders was about 5%. The CNT/Ni composite powders were precompacted in a graphite mold under a pressure of 5 MPa.

Strength versus ductility in carbon nanotube reinforced

Mar 01, 2014 Unlike, CNT/Ni (ball milled) nanocomposites, in the molecular-level mixed nanocomposite, individual CNTs are homogeneously dispersed within the nickel matrix, thus providing a large number of very strong nickel-CNT interfaces that leads to improvement in mechanical properties such as high yield strength and microhardness.

Dense nanostructured nickel produced by SPS from

Jan 01, 2013 Consequently, 120 g of elemental powder Ni (Alfa Aesar, APS 3-7 [micro]m in particle size, 99.9% purity) was milled in a planetary ball vario-mill Fritsch Pulverisette 4 [47, 48]. Based on previous works [49, 50], a specific ball milling condition was established at 250 rpm (rotation per minute) for the disk rotation speed and -50rpm for the

High-Energy Ball Milling and Synthesis Temperature Study

MgB2 monofilamentary nickel-sheated tapes and wires were fabricated by means of the ex-situ powder-in-tube method using either high-energy ball milled and low temperature synthesized powders. All sample were sintered at 920 C in Ar flow. The milling time and the revolution speed were tuned in order to maximize the critical current density in field (Jc): the maximum Jc value of 6 x 10e4 A/cm2

A comparison between different X-ray diffraction line

The microstructural characteristics of aluminum, copper and nickel powders are investigated using different X-ray diffraction line broadening analysis approaches. Prior to analysis, the powders were ball-milled to produce a nanocrystalline structure with high density of probable types of lattice defects. A variety of methods, including Scherrer, Williamson-Smallman, Williamson-Hall, Warren

Nanocrystalline Nickel Hydroxide in Pasted Nickel

Nanocrystalline nickel hydroxide powder was modified by the planetary ball milling (PBM), and the physical properties of both the ball-milled and un-milled nickel hydroxides were characterized by scanning electron microscopy, specific surface area (BET), particle size distribution and X-ray diffraction. It was found that the ball milling processing could obviously increase the surface area

CATALOGED BY WCOSI-3 TI-

35 Metallwerk Plansee Ball Milled in Steel Mill with WC Balls, Ball Mill Mixed with 20% Nickel, Cold Pressed and Vacuum Sintered . 92 WADC TR 54-13 Part II vii. LIST OF TABLES * Table Page 1 Investigated Materials 3 2 Chemical Composition of Commercial Titanium Carbides .. . . . .. 4 3 Reduction of Particle Size During Ball Milling in Different