The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The evolution of microstructure and the effect of laser welding velocity, flow rate of side-blow shielding gas and defocusing distance on fusion zone shape during continuous laser welding of dissimilar metals K418 and 42CrMo were investigated.
Using a torque-rheometer, ceramic-polymer extrudable mixtures were prepared to produce lead zirconate titanate (PZT) fibers through a co-extrusion process. A 7.7 mm diameter PZT-polymer rod was coupled with a 24 mm diameter carbon black-polymer shaped cylinder. This so called preform composite was extruded through a 1 mm die. By this method, 300 mum PZT fiber structures were successfully achieved...
The effects of an inner constraint layer and alumina particles on the microstructure, strength, and shrinkage of the laminated low-temperature cofired ceramic (LTCC) green sheet were investigated. A crystalline glass mixed with alumina particles was used as inner constraint layer. Sintering shrinkage in the x-y direction of the LTCC is related to the bending strength of the alumina particle and glass-ceramic...
The minimal continuous thickness of Mo film was obtained. Microstructure analysis shows the characteristics peak increases sharply and RMS surface roughness reaches its maximum when thickness approaches the minimal continuous thickness. RMS then decreases rapidly.
Surface-confined molecularly imprinted polymer (MIP) layers in the surface of mesoporous silica sphere (SBA-15) using atom transfer radical polymerization (ATRP) were prepared successfully. By taking SBA-15 microspheres as sacrificial material, MIPs we got had the complementary structure with SBA-15 microspheres and the special recognition sites were fixed in the surface of matrix materials in maximum...
The failure mechanism of lead-free solder interconnections under thermal cycling has been studied by cross-polarized light microscopy, scanning electronic microscopy (SEM), and nanoindentation test. From the results of finite element modeling (FEM), it was found that the critical solder interconnection was located at the chip corner, and the stress was concentrated at the outer neck region beneath...
The atom diffusion and growth behavior of intermetallic compound (IMC) at Sn3.5Ag0.5Cu/Cu interfaces under isothermal aging and thermal-shearing cycling conditions were investigated. The results show that the morphology of Cu6Sn5 IMCs formed at Sn3.5Ag0.5Cu/Cu interface changed gradually from scallop-like to chunk-like, and IMCs thickness developed with the isothermal aging and thermal-shearing cycling...
In this paper, Traces of Cr were added into Sn-8Zn-3Bi solder alloys to study the influences of Cr on mechanical properties and high temperature reliability of solder alloys by room temperature tensile test and high-temperature aging treatment. With observation of microstructure and fracture surface analysis, the strengthening mechanisms of Cr in solder alloys were discussed. Experiments show that:...
In this study, we tried to cut thin multi-walled CNTs (thin-MWCNTs) using a tip sonication method and investigated the cutting effect of CNTs from their microstructure and also evaluated field emission properties.
In this study, the fabrication technologies for a gated CuO nanowire emitter were investigated. It is found that the interlayer between CuO nanoemitter and cathode electrode is crucial to achieve good emission. Attempts were made to improve the interlayer structure, including using multilayer-metal thin film electrode and etch residue cleaning.
Mesocarbon microbeads (MCMB) were prepared by heating a medium coal tar pitch at 420degC for 2 hours, with the P-toluene sulphonic acid (PTSA) and the phenyl silicone oil as the catalyst and the reaction medium respectively. After the oxidative stabilization of MCMB, the oxygen content and the number of functional groups are increased, while the micro-crystal structures become worse. However, after...
The microstructure variations with various well thickness of InGaN/GaN MQWs were demonstrated. In 2 nm well thickness, QDs were better confined near the designated QWs layers and might resulted in a higher radiative efficiency due to the less strain energy.
Recently, universal power law becomes widely used. In this paper, it was used to study the ZnO/Bi2O3 ceramics. Bi2O3 is the only additive of ZnO here in order to directly study the effect of Bi2O3 in ZnO. ZnO samples with different content of Bi2O3 were made by the traditional ceramic technique. Then the microstructure of the acid erosion surface was observed by polarized optical microscope, the dielectric...
Our group has demonstrated a commercially viable, continuous, in-line process to fabricate PV devices with efficiencies of 13% on a low iron soda-lime glass (3"??3") with anti-reflection coatings. The process has been extended to large area devices (16"??16" substrate size). In this paper we present our results on the microstructural features of PV devices subjected to stress conditions...
The overall demand to reduce solar energy costs gives a continuous drive to reduce the thickness of silicon wafers. Handling and bowing problems associated with thinner wafers become more and more important, as these can lead to cells cracking and high yield losses. In this paper a discussion of the microstructure and mechanical properties of the aluminium on the rear side of a solar cell is presented...
A model is proposed to assign the hydrogen complexes in amorphous and nano/microcrystalline silicon to the hydride stretching modes in infrared spectra. We demonstrate that this analysis approach is a helpful tool to characterize the material properties of amorphous and microcrystalline silicon.
Polycrystalline silicon still guarantees its application on solar cells as important market product until year 2050. Due to the increase of photovoltaic industry needing, technologies to produce low cost silicon will be needed. The metallurgical grade silicon (Si-GM) has been used to produce Si substrates by the atmospheric plasma thermal spray (APTS) which has the advantages of a low cost and fast...
The flexure of microstructured polymers affects hydrophobicity. As curvature becomes more positive, droplets suspended on the tops of asperities are suspended on fewer asperities, resulting in an increase in contact angle and a decrease in slide angle. Critical curvature constraints presented here can be used to design microstructure geometries that maintain the suspension of a droplet when curved...
We present a novel method for controlling the growth orientation of individual carbon nanotube (CNT) microstructures on a silicon wafer substrate. Our method controls the CNT forest orientation by patterning the catalyst layer used in the CNTs growth on slanted KOH edges. The overlap of catalyst area on the horizontal bottom and sloped sidewall surfaces of the KOH-etched substrate enables precise...
The effect of post deposition hydrogen plasma treatment on microstructural, optical and transport properties of hydrogenated nanocrystalline silicon (nc-Si:H) have been investigated. Nc-Si:H thin film were deposited on glass substrate with 33% hydrogen dilution at 200??C using reactive RF sputtering. Thin films of nc-Si:H were treated with hydrogen plasma with various plasma power densities (0.1 -...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.