scholarly journals Effect of the Current Density in the Electrical Resistance Sintering Technique to Fabricate a β-Ti-Nb-Sn Ternary Alloy for the Biomedical Sector

2021 ◽  
Author(s):  
Mariana Rossi ◽  
Montserrat Vicenta Haro Rodríguez ◽  
Angel Vicente Escuder ◽  
Eber de Santi Gouvêa ◽  
Margarida Juri Saeki ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Electrical Resistance ◽  
Central Zone ◽  
Electrical Current ◽  
Peripheral Zone ◽  
Fast Method ◽  
X Ray Diffraction ◽  
Current Densities ◽  
Electrical Current Density

Abstract The electrical resistance sintering is a fast method to fabricate metallic samples in the field of metallurgy and it was used to obtain the Ti-Nb-Sn alloy to be applied as biomaterial, variyng different electrical current densities (11, 12 and 13 kA). The powders were obtained by mechanical alloying, then they were compacted at pressure of 193 MPa during 700 ms. The structure and microstructure of the powders and the samples was evaluated by x-ray diffraction, by Field Emission Scanning Electron Microscopy and electron back-scattered diffraction. The mechanical properties were evaluated by microhardness assay and corrosion resistance was made in Ringer Hartmann’s solution at 37ºC. The samples are formed by α, α” and phase β. The % of phase β in the samples obtained at 11, 12 and 13 kA was 96.56, 98.12 and 98.02 respectively. The peripheral zone present more presence of microporosity than the central zone. The microstructure is also formed by bcc-β grains equiaxial, and the samples obtained at 12 kA present better homogeneity of the microstructure. The grain size increased with the increase of the electrical current density. The microhardness are in the range of 389-418 HV and decreased with the increase of electrical current density. Corrosion tests proved excellent corrosion resistance of the alloys (0.24-0.45 µA/cm2). The standard deviation of kinetic parameters of the samples at 11 and 13 kA were very higher, related to the lack of homogeneity of the microstructure.

Application of near-field scanning microwave microprobe to electrical current density mapping

2005 ◽  
Vol 86 (23) ◽  
pp. 234101 ◽  
Author(s):  
Roberto S. Aga ◽  
Xiang Wang ◽  
Jonathan Dizon ◽  
Jesse Noffsinger ◽  
Judy Z. Wu
Keyword(s):  
Current Density ◽  
Near Field ◽  
Electrical Current ◽  
Density Mapping ◽  
Near Field Scanning ◽  
Electrical Current Density

scholarly journals A microstructural and corrosion resistance study of (Zr, Si, Ti)N-Ni coatings produced through co-sputtering

DYNA ◽  
2018 ◽  
Vol 85 (207) ◽  
pp. 192-197 ◽  
Author(s):  
Estrella Natali Borja-Goyeneche ◽  
Jhon Jairo Olaya-Florez
Keyword(s):  
Corrosion Resistance ◽  
Nickel Content ◽  
Corrosion Current ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Current Densities ◽  
Fcc Phase

This work researches the influence of the nickel content on the structural and anticorrosive properties of ZrSiTiN films deposited by means of reactive co-sputtering on alloys of Ti6Al4V. The morphology and structure were analyzed by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the chemical composition was identified via X-ray scattering spectroscopy (EDS). The corrosion resistance was studied using potentiodynamic polarization (PP) tests employing a 3.5% by weight NaCl solution. In the films, an increase of Ni up to 6.97 at% was observed, while in XRD the FCC phase of (Zr, Ti) N was identified, with a mixed orientation in planes (111) and (200), which tended to diminish with the increase of Ni. Finally, with the addition of Ni, the corrosion current densities were reduced from 5.56 𝑥 10−8 to 2.64 𝑥 10−9 𝐴/𝑐m2. The improvement in the corrosion resistance is due to the effect of the Ni on the microstructure of the system (Zr, Ti) N, which can improve the quality of the passive film and prevent crystalline defects and corrosion zones.

Fabrication of WC and WC(Co) Codeposited Nickel Composite Coating by Electroplating Method for the Replacement of Chromium Coating

2008 ◽  
Vol 569 ◽  
pp. 225-228 ◽  
Author(s):  
Dae Geun Kim ◽  
Jae Ho Lee
Keyword(s):  
Particle Size ◽  
Composite Coating ◽  
Current Density ◽  
Adsorption Mechanism ◽  
Electrical Current ◽  
Chromium Coating ◽  
Adsorption Rate ◽  
Hydrodynamic Conditions ◽  
Strong Adsorption ◽  
Electrical Current Density

The codeposition of fine WC and Co coated WC particles from nickel Watt’s bath has been investigated. Electroplating of Ni/WC and Ni/WC(Co) composites coating were carried out at different current density with variation of particle size. The effect of hydrodynamic conditions of the codeposition of Ni/WC bath has been investigated. The Guglielmi adsorption mechanism is applied to the electroplating of the fine WC and WC(Co) in Ni matrix. The adsorption rate of determination step is controlled by the transferal process of loose adsorption to strong adsorption. The embedded WC concentration can be increased both by increasing electrical current density and additional WC concentration in the bath.

Tribological Behavior at Dry Sliding by Electric Current of Cu-Cr-S Alloy after Equal Channel Angular Pressing

2016 ◽  
Vol 721 ◽  
pp. 430-435 ◽  
Author(s):  
Lembit Kommel
Keyword(s):  
Electrical Conductivity ◽  
Wear Rate ◽  
Equal Channel Angular Pressing ◽  
Wear Mechanism ◽  
Current Density ◽  
Thermomechanical Processing ◽  
Energy Dispersive Spectrometer ◽  
Electrical Current ◽  
Angular Pressing ◽  
Electrical Current Density

The wear tests of ultrafine-grained Cu-0.68Cr-0.02S energy alloy after equal channel angular pressing followed heat treatment were carried out in alloy-graphite sliding pair system without lubricant at different contact electrical current density. The sutable microstructure, mechanical properties and electrical conductivity of severely deformed alloy have been formed on the samples with different levels of parameters of thermomechanical processing. The microstructure and wear surfaces of the samples have been studied using optical microscope and field emission scanning electron microscope equipped with energy dispersive spectrometer. The results illustrated that the mass loss at wear, wear rate and wear mechanism depend on microstructure, hardness and electrical conductivity of test materials as well as normal pressure stress and electrical current density on the contact surface. The mechanical and physical properties of alloy, testing parameters and their influence on the wear rate as well as wear mechanism are analyzed.

scholarly journals THE ELECTRICAL CURRENT DENSITY VECTOR IN THE INNER PENUMBRA OF A SUNSPOT

2010 ◽  
Vol 721 (1) ◽  
pp. L58-L61 ◽  
Author(s):  
K. G. Puschmann ◽  
B. Ruiz Cobo ◽  
V. Martínez Pillet
Keyword(s):  
Current Density ◽  
Electrical Current ◽  
Current Density Vector ◽  
Density Vector ◽  
Electrical Current Density
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