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We present a new method to sort non-magnetic conductive metals — specifically brass, copper and aluminium — with the aim of improving economic yields in the scrap metal and recycling industries. The method uses the impedance spectra of the metal objects derived from the scattered magnetic field. Preliminary results are presented on a small sample set showing good accuracy across all metal classes...
High frequency power electronic converters require lossless, accurate and isolated current measurement. High frequency currents through a Printed Circuit Board (PCB) trace generates a non-uniform magnetic field around the trace. The non-uniform magnetic fields can be normalized by means of utilizing Magnetic Field Concentrators (MCON) using conductive materials. In this work, the effect of different...
In this paper, an investigation of arc root behavior on a pair of parallel electrodes is presented. An effective filtering method is introduced to allow the clear observation of arc root behavior. The position of the arc root is identified and tracked by a multi-objective dynamic tracing algorithm. Thus the trajectories and the speeds of arc roots can be obtained. The results show that the movement...
The use of electromagnetic shielding materials continues to grow in terms of research and application at various areas. In this paper, shielding effectiveness measurements are conducted to investigate the behavior of three different materials against electromagnetic fields. These materials are copper wire mesh, galvanized wire mesh, and aluminum plate. The purpose of using wire mesh structures is...
This paper presents channel measurements for short range radar applications in a frequency range from 5 GHz up to 7.5 GHz. For these measurements antennas with a half power beam width of 80° and circular polarization were provided by Maxim Integrated. The measured scenarios included a 28 mm copper pipe, a 26 cm × 28 cm aluminium plate, a bicycle and a 75 mm polokal plastic pipe. All measurements were...
Insulated gate bipolar transistor (IGBT) operates at high current, high power and repeated shock current conditions. Joule heating induced during high current conditions, subsequently raising the temperature of the IGBT module. In this paper, we carried out the DC power cycling test with the 200 A current condition. The temperature distribution and the temperature change process of the whole IGBT...
This study reports the design and experimental results of a fully-passive solid-state RF switch based on the Conductive Bridging Memory Technology, popularly known as CBRAM. The developed device is a shunt mode RF switch based on a Metal-Insulator-Metal (MIM) structure with Copper — Nafion — Aluminum switching layers on a Coplanar Waveguide (CPW) transmission line, operational in the DC to 3GHz range...
In this work we present the performance of metallic (copper and aluminum) and graphene buckypaper based microstrip transmission lines and the comparison between these device configurations. The graphene buckypapers were deposited by a simple vacuum filtration method, leading to freestanding paper with 350 Dm thickness and diameter up to 1.2 inches. After deposition and drying, the graphene paper and...
Aluminium is widely used as conductor material for power cables, but corrosion taking place under specific circumstances can have impact on its reliability. Aluminium corrosion under the influence of an alternating current was studied experimentally. Submerged cable segments with inflicted damage exposing the conductors resulted in a continuous corrosion of the conductor material. Effects of temperature...
Induction motor is the most popular load in the transportation systems like Hybrid vehicle, Traction and Propeller. Now-a-days most of the researches are done on hybrid vehicle. It is very important to study about the cost effective, efficiency and quality on induction motor performance. For easy transportation purpose the weight of the motor is low and similarly for the performance of the motor the...
The corrosion behavior of the anodized Al alloys in the electrolytes containing different metal ion has been investigated. The galvanic corrosion current of anodized AA6061 aluminum plate and C2800 brass plate couples was measured using a zero resistance ammeter for 8 hours in solution containing 3000ppm of copper sulfate. The corrosion current of AA6061-T6 specimen was 8.9 × 10−7 A/cm2 and 3.1 ×...
This article proposes the research and simulation of general bars of medium voltage metal enclosed switchgear, made of aluminum bars with copper contacts, in order to find a similar or even more convenient solution than that of copper bars, both from a technical and economic point of view. The goal is to improve heat distribution at the passage of the current, in the bar and particularly in contacts,...
The high frequency resonant current in coupler would inevitable results in interaction of electromagnetic force (EMF), leading to short service life, poor security and low reliability of wireless power transmission (WPT). It may be worse when electromagnetic shielding (EMS) materials are used. The mechanism and characteristics of the EMF on various EMS materials are revealed. Based on Lorentz force...
The use of a thick Copper layer on top of an AlCu-metallization stack instead of a common thick Aluminium layer triggers the need for a change in the reliability characterization, the test structure layouts and reliability test methods. The failure and degradation mechanisms of thick Copper and Aluminium are partly different for the material as well as for thick and thin metal layers. Electromigration...
This paper presents a mathematical model of temperature in solar thermal which are evinced in the second-order partial differential equation. The solar thermal analysis uses copper pipe, aluminium pipe, and anodized aluminium pipe to compare temperature distribution of water from three types of pipe. In a computer simulation, 3-D finite element method established in MATLAB program were applied for...
Contactless dosing of minute amounts of molten metals in the form of micron sized droplets is a promising technology with applications in the area of three dimensional printing (3DP) and electronics manufacturing. However the generation of droplets of higher melting point metals, such as aluminum and its alloys, has proven to be a challenging task. Difficulties arise mainly due to the high temperatures...
Friction stir spot welding (FSSW) is a solid-state welding process used for joining similar and dissimilar materials. AA1060 and C11000 sheets were joined using different process parameters and tool geometries. The presence of a copper rings also called hooks were observed in all the produced spot welds and their length increases with the tool shoulder plunge depth; whereas the spot welds produced...
Fabrication of anti-corrosion and self-cleaning superhydrophobic coatings for metallic surfaces which are regenerable and durable in the aggressive conditions has shown tremendous interest in materials science. In this work, the superhydrophobic coatings on metallic surfaces (aluminum, steel, copper) were prepared chemical etching process. Thermal, mechanical, ultra-violet stability of these coatings...
In 1991, a game changing technique was introduced into the metal joining community. Patented in 1991 by The Welding Institute, the Friction Stir Welding (FSW) process has since transformed the way metal joining is being done. Since then, many industries have come to embrace the new joining technology due to its ease of operation and other numerous advantages it offers. Aside from the ease with which...
The article describes the application of electrochemical methods of analysis to predict the nature of oxidation-reduction reactions in the processes of chemical and electrochemical formation of solder materials for high-density circuit wiring of microcircuit chip. Were studied the effective concentration of ions in contact chemical deposition of zinc on aluminum, composition and thermodynamic characteristics...
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