5,091 Matching Results

Search Results

Advanced search parameters have been applied.

Contributions to the Data on Theoretical Metallurgy: [Part] 16. Thermodynamic Properties of Nickel and its Inorganic Compounds

Description: From Introduction: "The compilation of thermodynamic properties of nickel and its inorganic compounds was undertaken as part of a continuing effort by the Federal Bureau of Mines to provide information for the extractive metallurgist to use as guidelines for research on improving established process or developing new ones. This report also provides useful information for other areas of thermochemical research."
Date: 1976
Creator: Mah, Alla D. & Pankratz, L. B.
Partner: UNT Libraries Government Documents Department

Conversion of Nicaro Nickel Oxide to Nickel Metal

Description: Report issued by the Bureau of Mines over testing conducted on nickel oxide to produce nickel metal. Details of testing methods and results are presented. This report includes tables, illustrations, and photographs.
Date: 1959
Creator: Mahan, W. M.; Melcher, N. B.; Riott, J. P. & Ostrowski, E. J.
Partner: UNT Libraries Government Documents Department

Kinetic study of mass transfer by sodium hydroxide in nickel under free-convection conditions

Description: An investigation was conducted using static capsules fabricated from "L" nickel tubing to determine the effect of temperature level, temperature gradient, and test duration on corrosion and mass transfer by molten sodium hydroxide under free-convection conditions. A base temperature range from 1000 degrees to 1600 degrees F with temperature differences to 500 degrees was studied. The rate of mass transfer was found to be strongly dependent on both temperature level and gradient. The rate shows little tendency to decrease for test durations up to 200 hours, although the concentration of nickel in the melt approaches a limited value after 100 hours.
Date: March 10, 1954
Creator: Mosher, Don R. & Lad, Robert A.
Partner: UNT Libraries Government Documents Department

The nickel dip : a radioisotope study of metallic deposits in porcelain enameling

Description: Report discussing the use of radioisotope tracer techniques to study the following phenomena: the effect of nickel dip on the deposition of cobalt metal during firing of a cobalt-bearing ground coat, the effect of surface pretreatment on the amount and distribution of nickel deposited from nickel dip on enameling iron, and the effect of application and firing of cobalt-free and cobalt-bearing enamels on the chemical form and physical distribution of nickel previously deposited on enameling iron by the nickel dip.
Date: February 1956
Creator: Richmond, Joseph C.; Kirkpatrick, Harry B. & Harrison, William N.
Partner: UNT Libraries Government Documents Department

Wear and sliding friction properties of nickel alloys suited for cages of high-temperature rolling-contact bearings 1: alloys retaining mechanical properties to 600 degrees F

Description: Report presenting a study of the wear and sliding friction properties of a number of nickel alloys operating against hardened SAE 52100 steel. The alloys included L nickel, wrought monel, cast monel, cast modified H monel, cast S monel, Invar, Ni-Resist 3, and Nichrome V.
Date: August 1952
Creator: Johnson, Robert L.; Swikert, Max A. & Bisson, Edmond E.
Partner: UNT Libraries Government Documents Department

Electrodeposit of Nickel

Description: The purpose of this study is to investigate the varying conditions in types of solutions, concentrations of solutions, hydrogen-ion concentration, current densities and potentials in the electro deposition of nickel.
Date: August 1937
Creator: Rohrer, Charles Stephen
Partner: UNT Libraries

In situ spectroscopic detection of SMSI effect in a Ni/CeO2 system: hydrogen-induced burial and dig out of metallic nickel

Description: In situ APPES technique demonstrates that the strong metal support interaction effect (SMSI) in the Ni-ceria system is associated with the decoration and burial of metallic particles by the partially reduced support, a phenomenon reversible by evacuation at high temperature of the previously absorbed hydrogen.
Date: June 29, 2010
Creator: Caballero, Alfonso; Holgado, Juan P.; Gonzalez-delaCruz, Victor M.; Habas, Susan e.; Herranz, Tirma & Salmeron, Miquel
Partner: UNT Libraries Government Documents Department

Role of Nickel Dip in Enameling of Sheet Steel

Description: Note presenting an investigation of the effects of the firing time and the weight of nickel deposited from the nickel-dip solution on the adherence developed by a cobalt-free and a cobalt-bearing ground-coat enamel on both enameling iron and a titanium-bearing low-carbon steel. Results regarding the effect of nickel dip on adherence, effect of nickel dip on fishscaling, effect of nickel dip on oxidation of steel, nickel remaining on steel after various firing treatments, and effect of nickel dip on appearance of enamel-metal interface are provided.
Date: June 1954
Creator: Moore, D. G.; Pitts, J. W. & Harrison, W. N.
Partner: UNT Libraries Government Documents Department

Effect of pH and Concentration of Ammonium Persulfate on Colorimetric Determination of Nickel by Dimethylglyoxime Method

Description: The following report records the study of the optimum pH of the method of the colorimetric dimethylglyoxime for nickel before the addition of oxidant and the concentration of ammonium persulfate needed to insure complete oxidation to higher nickel valence states and thus prevent precipitation of less soluble nickelous salt that was made. Results of this study is presented in Table 1.
Date: July 30, 1952
Creator: White, J. C.
Partner: UNT Libraries Government Documents Department

Cladding Alloys for Fluoride Salt Compatibility

Description: This report provides an overview of several candidate technologies for cladding nickel-based corrosion protection layers onto high-temperature structural alloys. The report also provides a brief overview of the welding and weld performance issues associated with joining nickel-clad nickel-based alloys. From the available techniques, two cladding technologies were selected for initial evaluation. The first technique is a line-of-sight method that would be useful for cladding large structures such as vessel interiors or large piping. The line-of-sight method is a laser-based surface cladding technique in which a high-purity nickel powder mixed into a polymer binder is first sprayed onto the surface, baked, and then rapidly melted using a high-power laser. The second technique is a vapor phase technique based on the nickel-carbonyl process that is suitable for cladding inaccessible surfaces such as the interior surfaces of heat exchangers. An initial evaluation for performed on the quality of nickel claddings processed using the two selected cladding techniques.
Date: June 1, 2011
Creator: Muralidharan, Govindarajan; Wilson, Dane F; Walker, Larry R; Santella, Michael L & Holcomb, David Eugene
Partner: UNT Libraries Government Documents Department

Investigation of the NiAl Phase of Nickel-Aluminum Alloys

Description: Note presenting an investigation to determine the effects of composition and homogenization heat treatments on the hardness and tensile properties of cast alloys of the NiAl intermetallic phase. The phase exists over a wide range of composition with stoichiometric NiAl at 31.5 percent aluminum. Results regarding the effects of the casting method and mechanical properties of the homogenized NiAl phase are provided.
Date: January 1957
Creator: Grala, Edward M.
Partner: UNT Libraries Government Documents Department

Investigation of the Ni(sub 3)Al Phrase of Nickel-Aluminum Alloys

Description: Note presenting an investigation to determine the effects of homogenization treatments and of composition on the tensile properties of as-cast alloys in the Ni(sub 3)Al-intermetallic-phase region. Results regarding the effects of the casting method, hot-workability of stoichiometric Ni(sub 3)Al, mechanical properties, and microstructure of Ni(sub 3)Al are provided.
Date: April 1956
Creator: Grala, Edward M.
Partner: UNT Libraries Government Documents Department

Corrosion Resistance of Nickel Alloys in Molten Sodium Hydroxide

Description: Note presenting a study of the corrosion resistance of 11 nickel-base compositions to molten sodium hydroxide at 1500 and 1700 degrees Fahrenheit in order to find a container material for the caustic at these temperatures. Results are provided for the solid-solution alloys, nickel with mechanically dispersed second phase materials, and the precipitation-hardened alloy.
Date: January 1958
Creator: Probst, H. B.; May, C. E. & McHenry, Howard T.
Partner: UNT Libraries Government Documents Department

The Use of Metallic Inhibitors for Eliminating Mass Transfer and Corrosion in Nickel and Nickel Alloys by Molten Sodium Hydroxide

Description: Memorandum presenting the effectiveness of chromium and aluminum as inhibitors for mass transfer and corrosion in nickel and nickel alloys by sodium hydroxide under free convection and at fluid velocities of 15 feet per second. The addition of 1 percent by weight of 325-mesh chromium powder to the caustic essentially eliminated the transfer for 50 hours at 1500 degrees Fahrenheit with a temperature difference of 20 degrees Fahrenheit and a flow of 15 feet per second. Results regarding the static test, the toroid test, and a description of the chemical reactions are provided.
Date: February 1955
Creator: Forestieri, Americo F. & Lad, Robert A.
Partner: UNT Libraries Government Documents Department

Determining the "State of Charge" of Nickel-Cadmium Batteries by Farad Capacitance Measurements

Description: From abstract: "A rapid simple method has been developed for determining state of charge of the widely used nickel-cadium rechargeable battery. The method described is based on the experimentally verified relationship between farad capacitance and state of charge."
Date: August 1968
Creator: Latner, Norman
Partner: UNT Libraries Government Documents Department

Synthesis and Characterization of Dimethylbis(2-pyridyl)borate Nickel(II) Complexes: Unimolecular Square-Planar to Square-Planar Rotation around Nickel(II)

Description: This article reports the synthesis, characterization, and solution dynamics of the novel nickel(II) complexes (dimethylbis(2-pyridyl)borate)(triphenylphosphine)nickel(II) chloride (4) and (dimethylbis(2-pyridyl)borate)nickel(II) acetylacetonate (6).
Date: April 7, 2014
Creator: Celaje, Jeff A.; Pennington-Boggio, Megan K.; Flaig, Robinson W.; Richmond, Michael G. & Williams, Travis J.
Partner: UNT College of Arts and Sciences

Layered nickel based superconductors

Description: We review the properties of Ni-based superconductors which contain Ni{sub 2}X{sub 2} (X=As, P, Bi, Si, Ge, B) planes, a common structural element to the recently discovered FeAs superconductors. We also compare the properties ofthe Ni-and Fe-based systems from a perspective ofelectronic structure as well as structure-property relations.
Date: January 1, 2009
Creator: Ronning, Filip; Bauer, Eric D; Park, Tuson; Kurita, Nobuyuki; Klimczuk, T; Movshovich, R et al.
Partner: UNT Libraries Government Documents Department

Electrodeposition of Nickel and Nickel Alloy Coatings with Layered Silicates for Enhanced Corrosion Resistance and Mechanical Properties

Description: The new nickel/layered silicate nanocomposites were electrodeposited from different pHs to study the influence on the metal ions/layered silicate plating solution and on the properties of the deposited films. Nickel/layered silicate nanocomposites were fabricated from citrate bath atacidic pHs (1.6−3.0), from Watts’ type solution (pH ~4-5), and from citrate bath at basic pH (~9). Additionally, the new nickel/molybdenum/layered silicate nanocomposites were electrodeposited from citrate bath at pH 9.5. The silicate, montmorillonite (MMT), was exfoliated by stirring in aqueous solution over 24 hours. The plating solutions were analyzed for zeta potential, particle size, viscosity, and conductivity to investigate the effects of the composition at various pHs. The preferred crystalline orientation and the crystalline size of nickel, nickel/layered silicate, nickel/molybdenum, and nickel/molybdenum/layered silicate films were examined by X-ray diffraction. The microstructure of the coatings and the surface roughness was investigated by scanning electron microscopy and atomic force microscopy. Nickel/molybdenum/layered silicate nanocomposites containing low content of layered silicate (1.0 g/L) had increase 32 % hardness and 22 % Young’s modulus values over the pure nickel/molybdenum alloy films. The potentiodynamic polarization and electrochemical impedance measurements showed that the nickel/molybdenum/layered silicate nanocomposite layers have higher corrosion resistance in 3.5% NaCl compared to the pure alloy films. The corrosion current density of the nickel/molybdenum/layered silicate nanocomposite composed of 0.5 g/L MMT is 0.63 µA·cm-2 as compare to a nickel/molybdenum alloy which is 2.00 µA·cm-2.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: August 2014
Creator: Tientong, Jeerapan
Partner: UNT Libraries

Surface modification of nickel battery electrodes by cobalt plasma immersion ion implantation and deposition

Description: Nickel hydroxide is the electrochemically active material in the positive electrode of several important rechargeable alkaline-electrolyte batteries. It is believed that divalent Ni(OH){sub 2} is converted to trivalent NiOOH as the electrode is electrochemically oxidized during the battery charging process, and the reverse reaction (electrochemical reduction) occurs during battery discharge, however the details of this process are not completely understood. Because these electrochemical reactions involve surface charge-transfer processes, it is anticipated that surface modification may result in improved battery performance. We used broad-beam metal ion implantation and Metal Plasma Immersion Ion Implantation and Deposition to add cobalt and other species to the nickel electrode surface. The principle of the latter technique is explained in detail. It is shown that implanted and deposited cobalt ions act as a dopant of Ni(OH){sub 2}, and thereby alter its electronic conductivity. This electronic effect promotes lateral growth of NiOOH nodules and more-complete conversion of Ni(OH){sub 2} to NiOOH, which can be interpreted in terms of the nodule growth model. Other dopants such as Au, W, Pb, Ta and Ti{sub 4}O{sub 7} were also tested for suppressing the parasitic oxygen evolution reaction in rechargeable nickel cells.
Date: February 1, 1995
Creator: Anders, S.; Anders, A.; Brown, I.; Kong, F. & McLarnon, F.
Partner: UNT Libraries Government Documents Department

Understanding and Tailoring the Mechanical Properties of LIGA Fabricated Materials

Description: LIGA fabricated materials and components exhibit several processing issues affecting their metallurgical and mechanical properties, potentially limiting their usefulness for MEMS applications. For example, LIGA processing by metal electrodeposition is very sensitive to deposition conditions which causes significant processing lot variations of mechanical and metallurgical properties. Furthermore, the process produces a material with a highly textured lenticular rnicrostructural morphology suggesting an anisotropic material response. Understanding and controlling out-of-plane anisotropy is desirable for LIGA components designed for out-of-plane flexures. Previous work by the current authors focused on results from a miniature servo-hydraulic mechanical test frame constructed for characterizing LIGA materials. Those results demonstrated microstructural and mechanical properties dependencies with plating bath current density in LIGA fabricated nickel (LIGA Ni). This presentation builds on that work and fosters a methodology for controlling the properties of LIGA fabricated materials through processing. New results include measurement of mechanical properties of LIGA fabricated copper (LIGA Cu), out-of-plane and localized mechanical property measurements using compression testing and nanoindentation of LIGA Ni and LIGA Cu.
Date: January 25, 1999
Creator: Buchheit, T.E.; Christenson, T.R.; Lavan, D.A. & Schmale, D.T.
Partner: UNT Libraries Government Documents Department

Torsion Testing of Diffusion Bonded LIGA Formed Nickel

Description: A test technique has been devised which is suitable for the testing of the bond strength of batch diffusion bonded LIGA or DXRL defined structures. The method uses a torsion tester constructed with the aid of LIGA fabrication and distributed torsion specimens which also make use of the high aspect ratio nature of DXRL based processing. Measurements reveal achieved bond strengths of 130MPa between electroplated nickel with a bond temperature of 450 C at 7 ksi pressure which is a sufficiently low temperature to avoid mechanical strength degradation.
Date: January 27, 1999
Creator: Buchheit, T.E.; Christenson, T.R. & Schmale, D.T.
Partner: UNT Libraries Government Documents Department