Reversed Pulse Plating of Silver-Cobalt for Connector Applications

2018 ◽  
Vol 2018 (1) ◽  
pp. 000403-000408
Author(s):  
Nazila Dadvand ◽  
Mina Dadvand ◽  
Georges Kipouros
Keyword(s):  
Cost Effective ◽  
Electrical Contacts ◽  
Cobalt Alloy ◽  
Low Friction ◽  
Metallic Contact ◽  
Silver Alloys ◽  
Electrodeposition Process ◽  
Pulse Electroplating ◽  
Silver Palladium ◽  
Electroplating Process

Abstract The manuscript describes the use of anti-galling silver-cobalt alloy as a novel metallic contact finish for connector applications. The purpose of this work was to develop a cost-effective and cyanide-free and self-lubricated silver-cobalt alloy deposited using reversed pulse electrodeposition process for silver-based contact finishes in electrical contacts applications. The manuscript describes a novel silver-cobalt alloy deposited through reversed pulse-electroplating process that provides exceptionally low friction coefficient (similar to hard gold) and outstanding wear resistance compared to standard silver and any commercially available electroplated silver alloys such as silver-tin, silver palladium, silver antimony, silver-bismuth, silver-tellurium, and silver-tungsten.

Desorption of Hydrogen from Palladium and Palladium-Silver Alloys followed by Differential Scanning Calorimetry

1972 ◽  
Vol 50 (9) ◽  
pp. 1321-1324 ◽  
Author(s):  
D. Artman ◽  
Ted B. Flanagan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Slow Step ◽  
Differential Scanning Calorimetric ◽  
Solid State Diffusion ◽  
Palladium Alloys ◽  
Scanning Calorimetry ◽  
Silver Alloys ◽  
State Diffusion ◽  
Silver Palladium ◽  
Palladium Silver

Differential scanning calorimetric curves have been obtained corresponding to the desorption of hydrogen from palladium and palladium–silver alloys. There was no evidence for the existence of an exotherm, following the endothermic desorption of hydrogen, which has been previously found and attributed to the relaxation of a metastable, expanded hydrogen-free palladium lattice. Heats of desorption have been evaluated from the areas of the endotherms and these are reasonable in the light of values obtained by other techniques. Comparisons of scanning curves for palladized and unpalladized hydrogen-containing silver–palladium alloys demonstrate that solid-state diffusion cannot be the slow step for the former but may be for the latter.

scholarly journals A Textile-Based Microfluidic Platform for the Detection of Cytostatic Drug Concentration in Sweat Samples

2020 ◽  
Vol 10 (12) ◽  
pp. 4392 ◽  
Author(s):  
Goran M. Stojanović ◽  
Maja M. Radetić ◽  
Zoran V. Šaponjić ◽  
Marija B. Radoičić ◽  
Milan R. Radovanović ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Cost Effective ◽  
Electrical Contacts ◽  
Cytostatic Drug ◽  
Variable Resistor ◽  
Microfluidic Platform ◽  
Textile Fabrics ◽  
Drug Concentrations ◽  
Artificial Sweat ◽  
Conductive Textile

This work presents a new multilayered microfluidic platform, manufactured using a rapid and cost-effective xurography technique, for the detection of drug concentrations in sweat. Textile fabrics made of cotton and polyester were used as a component of the platform, and they were positioned in the middle of the microfluidic device. In order to obtain a highly conductive textile, the fabrics were in situ coated with different amounts of polyaniline and titanium dioxide nanocomposite. This portable microfluidic platform comprises at least three layers of optically transparent and flexible PVC foils which were stacked one on top of the other. Electrical contacts were provided from the edge of the textile material when a microfluidic variable resistor was actually created. The platform was tested in plain artificial sweat and in artificial sweat with a dissolved cytostatic test drug, cyclophosphamide, of different concentrations. The proposed microfluidic device decreased in resistance when the sweat was applied. In addition, it could successfully detect different concentrations of cytostatic medication in the sweat, which could make it a very useful tool for simple, reliable, and fast diagnostics.

Co-electrodeposited Cu2ZnSnS4 thin-film solar cells with over 7% efficiency fabricated via fine-tuning of the Zn content in absorber layers

2016 ◽  
Vol 4 (10) ◽  
pp. 3798-3805 ◽  
Author(s):  
Jiahua Tao ◽  
Leilei Chen ◽  
Huiyi Cao ◽  
Chuanjun Zhang ◽  
Junfeng Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
High Performance ◽  
Cost Effective ◽  
Fine Tuning ◽  
Thin Film Solar Cells ◽  
Electrodeposition Process ◽  
Photovoltaic Materials ◽  
Zn Content ◽  
Cu2znsns4 Thin Film

A simple and cost-effective co-electrodeposition process has been demonstrated to fabricate high-performance Cu2ZnSnS4 (CZTS) photovoltaic materials with composition tunability and phase controllability.

Fluid Film Lubrication of Parallel Thrust Surfaces

1946 ◽  
Vol 155 (1) ◽  
pp. 49-67 ◽  
Author(s):  
A. Fogg
Keyword(s):  
Thrust Bearing ◽  
Fluid Film ◽  
Load Carrying Capacity ◽  
Low Friction ◽  
Metallic Contact ◽  
Tilting Pad ◽  
Load Carrying ◽  
Parallel Surfaces ◽  
Film Lubrication ◽  
Fluid Film Lubrication

During the course of an investigation into the general characteristics of various types of thrust bearing, it has been shown that opposed parallel surfaces, under certain conditions of operation, have a load carrying capacity approaching that of tilting pad bearings of the Michell type and of the same bearing area. Considerable evidence has been obtained, such as the low friction losses, the dependence of coefficient of friction on viscosity, speed and load, and the apparent absence of metallic contact, which strongly indicates that these bearings operate under fluid film conditions. Their performance does not seem to depend on a rounded inlet edge, and the apparent establishment of fluid film conditions without the usually accepted requirement of convergence of the bearing surfaces is regarded as a new phenomenon in lubrication. A tentative theory on broad lines is suggested as an explanation of the behaviour.

scholarly journals Experimental Assessment of a Sliding-Blade Inside-Out Ceramic Turbine

2020 ◽  
Author(s):  
Dominik Thibault ◽  
Patrick K. Dubois ◽  
Benoit Picard ◽  
Alexandre Landry-Blais ◽  
Jean-Sébastien Plante ◽  
...  
Keyword(s):  
High Efficiency ◽  
Cost Effective ◽  
Inlet Temperature ◽  
Brayton Cycle ◽  
Low Friction ◽  
Turbine Inlet Temperature ◽  
Blade Loading ◽  
Rotor Design ◽  
Inside Out ◽  
Acceptable Reliability

Abstract In order to reach 40% efficiency, sub-MW turbines must operate in a recuperated gas Brayton cycle at a turbine inlet temperature (TIT) above 1300°C. Current sub-MW turbines have material-related operating temperature limits. Still to this day, there is no cost-effective rotor design which operates at such high temperatures. This paper introduces a novel, sliding-blade, inside-out ceramic turbine (ICT) wheel configuration, which could enable high-efficiency sub-MW recuperated engines to be achieved with cheap monolithic ceramic blades. The inside-out configuration uses a rotating structural hoop, or shroud, to convert centrifugal forces into compressive blade loading. The sliding-blade architecture uses a hub with angled planes on which ceramic blades slide up and down, allowing to match the radial expansion of the structural shroud. This configuration generates low stress values in both ceramic and metallic components and can achieve high tip speeds. A prototype is designed and its reliability is calculated using CARES software. The result is a design which has a single blade probability of failure (Pf) of 0.1% for 1000 h of steady operation. Analyses also demonstrate that reliability is greatly dependent on friction at ceramic-to-metal interfaces. Low friction could lead to acceptable reliability levels for engine applications. The prototype was successfully tested in a laboratory turbine environment at a tip speed of 350 m/s and a TIT of 1100 °C without any damage.

scholarly journals Cost-Effective with Silver Alloys in Water

2017 ◽  
Vol 11 (4) ◽  
pp. 1707-1711
Author(s):  
Amal Aljuraifani ◽  
Azzah Alghamdi
Keyword(s):  
Cost Effective ◽  
Silver Alloys

scholarly journals Carrier photodynamics in 2D perovskites with solution-processed silver and graphene contacts for bendable optoelectronics

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Ridwan F. Hossain ◽  
Misook Min ◽  
Liang-Chieh Ma ◽  
Shambhavi R. Sakri ◽  
Anupama B. Kaul
Keyword(s):  
High Performance ◽  
Cost Effective ◽  
Electrical Contacts ◽  
Perovskite Layer ◽  
Solution Processed ◽  
Bending Tests ◽  
Multiple Contacts ◽  
Mechanical Modulation ◽  
Strain Dependent ◽  
Layered Perovskites

AbstractSilver (Ag) and graphene (Gr) inks have been engineered to serve as efficient electrical contacts for solution-processed two-dimensional (2D) organo-halide (CH3(CH2)3NH3)2(CH3NH3)n−1PbnI3n+1 (n = 4) layered perovskites, where all inkjet-printed heterostructure photodetectors (PDs) were fabricated on polyimide (PI) substrates. To date, limited studies exist that compare multiple contacts to enable high-performance engineered contacts to 2D perovskites. Moreover, of these few reports, such studies have examined contacts deposited using vapor-based techniques that are time-consuming and require expensive, specialized deposition equipment. In this work, we report on the inkjet printed, direct contact study of solution-processed, 2D perovskite-based PDs formed on flexible PI substrates. Solution processing offers a cost-effective, expedient route for inkjet printing Gr and Ag using a dispersion chemistry developed in this work that is compatible with the underlying 2D perovskite layer to construct the PDs. The wavelength λ-dependent photocurrent Ip peaked at λ ~ 630 nm for both PDs, consistent with the bandgap Eg ~ 1.96 eV for our semiconducting 2D perovskite absorber layer. The external quantum efficiency was determined to be 103% for Ag-perovskite PDs, where strain-dependent bending tests were also conducted to reveal the opto-mechanical modulation of the photocurrent in our devices.

Low Friction Cobalt-Based Coatings for Titanium Alloys

1997 ◽  
Author(s):  
K. Hajmrie ◽  
A.P. Chilkowich
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Frictional Contact ◽  
Protective Coatings ◽  
Fretting Wear ◽  
Cobalt Alloy ◽  
Low Friction ◽  
Jet Engine ◽  
Rubbing Pair ◽  
The Many

Abstract Protective coatings adapted for titanium alloys which come into frictional contact with one another are described. Among the many coatings investigated, the best ones are cobalt based. The coatings are sprayed only on one of the rubbing surfaces. During rubbing, a small part of the coating transfers to the unprotected titanium alloy surface. The rubbing pair is thus essentially composed of two cobalt alloy-based surfaces. This leads to low coefficient of friction and little or no damage to the rubbing surfaces. The coatings find particular application in the protection from adhesive and fretting wear, galling and seizure of gas turbine and jet engine parts or the like made from titanium alloys.

Experimental Assessment of a Sliding-Blade Inside-Out Ceramic Turbine

2020 ◽  
Author(s):  
D. Thibault ◽  
P. K. Dubois ◽  
B. Picard ◽  
A. Landry-Blais ◽  
J.-S. Plante ◽  
...  
Keyword(s):  
High Efficiency ◽  
Cost Effective ◽  
Inlet Temperature ◽  
Brayton Cycle ◽  
Low Friction ◽  
Turbine Inlet Temperature ◽  
Blade Loading ◽  
Rotor Design ◽  
Inside Out ◽  
Acceptable Reliability

Abstract In order to reach 40% efficiency, sub-MW turbines must operate in a recuperated gas Brayton cycle at a turbine inlet temperature (TIT) above 1300°C. Current sub-MW turbines have material-related operating temperature limits. Still to this day, there is no cost-effective rotor design which operates at such high temperatures. This paper introduces a novel, sliding-blade, inside-out ceramic turbine (ICT) wheel configuration, which could enable high-efficiency sub-MW recuperated engines to be achieved with cheap monolithic ceramic blades. The inside-out configuration uses a rotating structural hoop, or shroud, to convert centrifugal forces into compressive blade loading. The sliding-blade architecture uses a hub with angled planes on which ceramic blades slide up and down, allowing to match the radial expansion of the structural shroud. This configuration generates low stress values in both ceramic and metallic components and can achieve high tip speeds. A prototype is designed and its reliability is calculated using CARES software. The result is a design which has a single blade probability of failure (Pf) of 0.1% for 1000 h of steady operation. Analyses also demonstrate that reliability is greatly dependent on friction at ceramic-to-metal interfaces. Low friction could lead to acceptable reliability levels for engine applications. The prototype was successfully tested in a laboratory turbine environment at a tip speed of 350 m/s and a TIT of 1100 °C without any damage. These achievements demonstrate the robustness of the sliding-blade ICT configuration. Further research and development will focus on increasing tip speed and TIT to higher values.

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