The wear resistance mechanisms of a silicon carbide (SiC) paticulate reinforced Al–Li alloy composite at 250°C by a pyramidal indenter have been studied. It is found that the subsurface damages that control the wear resistance are: generation of dislocations and cracks in the SiC particles, interface debonding between matrix and reinforcements and plastic deformation of the matrix. © 1998 Elsev...

Large 6 mm× 9 mm silicon chips have been successfully bonded to alumina substrates with electroplated Au/Sn/Au structure at the eutectic omposition. The new bonding process is entirely fluxless, or flux-free. It is performed in vacuum (50 milliTorrs), where the oxygen content is educed by a factor of 15,200 comparing to air, to inhibit solder oxidation. Eutectic Au80Sn20 alloy is a well establi...

Dendritic and porous Ag-Pd alloy nanostructures were successfully fabricated on the surface of silicon substrate using the co-reduction method and galvanic replacement reaction, respectively. The molar compositions of Ag and Pd in the alloy could be modulated by controlling the molar ratios of metal precursors and reaction time. The Ag-Pd alloy nanostructures were characterized by transmission ...

Engineering silicon into nanostructures has been a well-adopted strategy to improve the cyclic performance of silicon as a lithium-ion battery anode. Here, we show that the electrode performance can be further improved by alloying silicon with germanium. We have evaluated the electrode performance of SixGe1-x nanoparticles (NPs) with different compositions. Experimentally, SixGe1-x NPs with com...

From different sources of carbon , propane have been chosen to get a wider band gap amorphous silicon alloy . After analyzing the conductivity and optical gap variation with the doping ratio , the best were used to fabricate 5x5 cm solar cells . Those cells are connected to form 75 x 75 cm panels. Photo-oxidation were carried out using different sources as an accelerated method to study the met...

In recent years, a lot of research has been done in the field of producing soft magnetic nano composites by means of mechanical alloying. These materials indicate more electrical resistance and permeability in comparison with soft magnetic composites (SMCs). In this research, reduction of silicothermal mixed powder (Nickel-oxide, Silicon and Iron) was carried out by mechanical alloying to form ...

The rapid inward migration of fluoride ions in growing anodic titanium oxide under a high electric field has been elucidated by anodizing a Ti-12 at% silicon alloy, where film growth proceeds at nearly 100% efficiency in selected electrolytes. Further, incorporated silicon species in the anodic film are immobile, acting as marker species. The migration rate of fluoride ions is determined precis...

RECENT DEVELOPMENTS IN HANDHELD X-RAY FLUORESENCE INSTRUMENTATION The introduction of new large area silicon drift detectors to handheld XRF technology expands technique capabilities with greater analytical range and lower detection limits James Pasmore, Director, Business Development [email protected] Thermo Niton Analyzers LLC Thermo Fisher Scientific 900 Middlesex Turnpike, Buil...

The present work has as main aim to make a small introduction about the types of steels, specially the ones used in the construction industry. This material is appreciated in construction due to its many advantages as strengths, resistance, adaptability and flexibility in design, durability, recyclability,...; even thou its also has week points like a low resistance to fire, weak against corros...