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The electrochemical deposition behaviors of Pd-Ni bimetal on different matrix materials were studied by means of the preparation of Pd-Ni/GC, Pd-Ni/foam-Ni and Pd-Ni/Ti electrodes. The effect of the matrix materials to the electrocatalytic activity of electrodes was investigated. CV results reveal that hydrogen absorbability of Pd-Ni/Ti electrode was obviously higher than the Pd-Ni/GC and Pd-Ni/foam-Ni...
The aim of the present work is to investigate on the mechanical and micro structural properties of dissimilar 2024 and 7075 aluminium plates joined by friction stir welding (FSW). The two plates, aligned with perpendicular longitudinal directions, have been successfully welded; successively, the welded plates have been tested under tension at room temperature in order to analyse the mechanical response...
Polyaniline/graphene nanocomposite (PANI/G) was synthesized by an in situ polymerization procedure. The microstructure of PANI/G was characterized to be a mixture of PANI nanowires and graphene sheets by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Energy Dispersive X-Ray Fluoresence Spectrometer (EDX). PANI/G was used to modify glassy carbon electrodes to detect...
Breakdowns are the usual limitation of the dielectric using. Nowadays, the irradiation of materials by the electron beam of a scanning electron microscope can exhibit such breakdown events and also permit more elementary characterization of charging properties of non conducting materials. So, SEM has been equipped to study the fundamental aspects of charge trapping in insulating materials, by two...
In this study, simple model systems are investigated in order to understand the relation between different wear regimes, electrical noise and life time in electrical sliding contacts. The results are interpreted in a system approach by analyzing the tribological system. Based on this interpretation an optimized contact system was developed with a significant improvement with respect to system life...
The behavior of DC-arcs on Ag-composites (Ag/SnO2 and Ag/SnO2/In2O3) and on Ag was investigated using a parallel rail setup. A high speed CCD-Camera (sampling rates of up to 40000 fps) was used to observe the appearance of the arc at the electrodes and its motion characteristics. Previously, the rails were polished up to 0.25 μm grain in order to avoid a possible influence of roughness on the arc...
Contact materials based on copper-chromium are widely used in vacuum interrupters for medium-voltage applications. The microstructures of contacts are rather coarse, with typical chromium particle sizes in the range of 100 microns. During switching operations, such as short-circuit current interruption, a vacuum arc is generated which in turn produces melted and resolidified layers at the contact...
This paper presents the synthesis and characterization of magnetite particles (covered and stabilized with mercaptoetnol) functionalized with invertase, using cyanuric chloride as spacer. The above synthesized materials were structurally characterized using Scanning Electron Microscopy, FT-IR spectroscopy, thermal analysis.
Recently, the materials scientists invented that the dye functionalized MWCNT found applications in photodynamic therapy, due to the apoptosis of targeted cancer cells by the coupled effect of photothermal as well as photodynamic effects. By grouping these ideas, a new type of material was synthesized. In the present investigation, Eosin Y, a xanthenes type dye was functionalized with MWCNT via ethylene...
For application of a lead-free composite solder in advanced electrical components, lead-free Sn3.5Ag0.5Cu composite solder was produced by mechanically mixing 0.5 wt.% nano-TiO2 particles with Sn3.5Ag0.5Cu solder. The corrosion behavior of the new Sn3.5Ag0.5Cu composite solder in 3.5 wt.% NaCl solution was investigated by using potentiodynamic polarization methods. The corrosion products formed during...
High speed turning experiments on powder metallurgy (PM) nickel-base superalloy, were conducted using coated carbide inserts under various speeds and dry cutting condition. Wear in ages of cutting tools was observed by SEM, adhesion and oxygen element distribution of tool surface was analyzed by EDS. Experimental results indicate that under the conditions, adhesive wear, oxidation wear and abrasiver...
The composite antibacterial agents were prepared with nano-hydroxyapatite containing polyvinyl alcohol, copper ions and zinc ions via the parcels and ion exchange respectively. The as-prepared antibacterial agents were characterized by X-ray diffraction, infrared spectrogram and scanning electron microscopy. The results show that PVA has been wrapped in the surface of hydroxyapatite, and copper and...
The Vacuum interrupter is the arc extinction chamber of the vacuum circuit breaker which is widely used in the medium voltage networks for interruption of short -circuit current. In the field of vacuum switching devices, the contact material is the most important parameter determining the switching behavior. During arcing, the contacts are eroded and hence there is a change in the surface microstructure...
Graphite nanosheets were synthesized on carbon fibers by floating catalyst method with the pretreatment of carbon fibers. Its width and height were 50 nm and 600 nm respectly. graphite nanosheets synthesized on carbon fibers may have potential applications in field emission.
In this research, kaolin is used as the raw material and modified to prepare an inorganic ion-exchange material through different modification methods. In this paper, several surface feature evaluation methods (SEM, NMR, IR) are used to discuss and analyze the modification process of kaolin. According to CEC measurement, the obtained inorganic ion exchange material has an ammonium ion exchange capacity...
The microstructure and mechanical properties were studied on X70 pipeline steel strips on 1700 Hot Mill produced by Tangsteel using methods of optical microscope, SEM and TEM tensile tests and so on. And effect of impurities in the steel on impact toughness was researched. The results show that microstructure of X70 pipeline steel strips is mainly acicular ferrite of which the grains are about 6μm...
According to the main technical parameters of Intermediate frequency (IF, range from 100Hz to 10,000Hz) electrical equipments, a variable-frequency and stabilized current experimental power source system with continuously adjustable output frequency and stationary output current is produced in this paper, and the rig of an arc erosion test research with computer testing system of IF and LV switching...
Several camera imaging techniques have been applied to the characterization of Cu(In,Ga)Se2 (CIGS) solar cells having a range of efficiencies. Photoluminescence (PL) imaging shows brightness variations after the deposition of the CIGS layer that persist through CdS deposition and subsequent processing steps to finish the devices. PL and electroluminescence imaging on finished cells show a correlation...
3D ICs is a promising new technology that has many advantages over traditional planar packages. To take advantage of this technology, new bonding techniques have to be developed to satisfy the need for high density micro interconnects. Solid liquid inter-diffusion bonding in which the bond is established by placing a low melting temperature material between high temperature melting substrate and applying...
The loading photocatalyst of TiO2/hollow pearls was prepared by sol-gel method and hollow pearls as carrier. The results indicate that the approach of TiO2 loading on hollow pearls is viable. The scanning electron microscope (SEM) images show that the coating layer is symmetrical on the hollow pearls; the UV-vis DRS shows that TiO2/hollow pearls has strong absorption in the UV range, and the absorption...
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