The aim of this investigation is to study the effect time and temperature on solid-state diffusion welding commercial aluminum alloy 2xxx series with a pure copper at 425°C, 475°C, 500°C, 525°C during holding times from 15 min 240 min. main characterization techniques were optical microscopy, scanning electron energy dispersive spectrometry, nanoindentation, microhardness measurements, x-ray di...

Pure copper, specifically oxygen-free copper (OFC), is widely used in superconductive and low-temperature refrigeration technologies owing to its superior electrical thermal conductive properties at cryogenic temperatures. These properties, which can be expressed terms of the residual resistivity ratio (RRR), are associated with purity or impurity concentration. High-purity a low concentration ...

The nanoparticles of gold doped with various percentage of copper (Cu 10%, 25%, 75%) were synthesized by wet-chemical method at room temperature. Copper (II) sulfate and gold (III) chloride trihydride was taken as the metal precursor and ascorbic acid as a reducing agent and anhydride maleic as surfactant. The reaction is performed with high-speed stirring at room temperature under nitrogen atm...

Previous investigations suggested that sulphide layers on pure silver surfaces were easily removed with a reducing plasma afterglow at atmospheric pressure, but harder to remove silver-copper alloys. In this study we investigated by synchrotron x-ray photoelectron spectroscopy the effect of tarnished silver, copper and sterling alloy. The results confirmed was able reduce in depth all sulphides...

In this study, a feasible green method for the synthesis of copper oxide nanocrystalline is described by using sour cherry juice which has a significant effect on crystalline size, and morphology. The benefits of the green method, not only nanometer scale are formed but also low-cost method are obtained in a normal atmosphere which it has been used (CH3COO)2Cu.H2O individually as Cu sources. Al...

In this study, a feasible green method for the synthesis of copper oxide nanocrystalline is described by using sour cherry juice which has a significant effect on crystalline size, and morphology. The benefits of the green method, not only nanometer scale are formed but also low-cost method are obtained in a normal atmosphere which it has been used (CH3COO)2Cu.H2O individually as Cu sources. Al...