W and Cu can be found in separate phases the W-Cu composites since these elements do not dissolve each other neither liquid nor solid phase, but with mechanical alloying it is possible to produce nonequilibrium alloys In this work nanostructured were produced by planetary ball milling. The powder was sintered on 900 °C 950 50 MPa pressure applied. meso- microstructure of samples, investigated S...

The alloy design and homogenization processes are intimately associated with the microstructure, phase composition performance for Al-Zn-Mg-Cu alloys. microstructures of a series alloys before after treatments were investigated along thermodynamic calculation to understand underlying relationship. eutectic (?-Al + M (Mg(ZnAlCu)2)) dominating Cu-enriched [AlCuMgZn] particles, both depending on Z...

Porous structured silicon or porous silicon (PS) powder was prepared by chemical etching of silicon powder in an etchant solution of HF: HNO₃: H₂O (1:3:5 v/v). An immersion time of 4 min was sufficient for depositing Cu metal from an aqueous solution of CuSO₄ in the presence of HF. Scanning electron microscopy (SEM) analysis revealed that the Cu particles aggregated upon an increase in metal co...

60) to be used for fabricating jewellery, so alloying additions are made to increase the hardness. Platinum jewellery alloys usually have platinum contents of 90 wt.% and higher. The most common alloys are hallmarked as 950 platinum (95 wt.%). Unlike carat gold (Au) jewellery alloys, where relatively large additions can be made (to alter the properties of the alloy such as its hardness or colou...

although cu and fe are immiscible under equilibrium conditions, they can form supersaturated solid solutions by mechanical alloying. in this paper, nano-structured of the metastable cu-fe phase containing 10, 15, 20 and 25% wt fe were synthesized by intensive ball milling for 15h, in order to achieve a solid solution of fe in cu. the phase composition, dissolution of the fe atoms into the cu ma...

Synthesis of dimethyl carbonate (DMC) from CO2 and methanol under milder reaction conditions was performed using reduced cerium oxide catalysts and reduced copper-promoted Ce oxide catalysts. Although the conversion of methanol was low (0.005-0.11%) for 2 h of reaction, DMC was synthesized as low as 353 K and at total pressure of as low as 1.3 MPa using reduced Cu-CeO2 catalyst (0.5 wt% of Cu)....

The Zr element is one of the important grain refiners for 7xxx series Al-Zn-Mg-Cu alloys, but effect content more than 0.15 wt.% needs to be deeply investigated under action ultrasonic vibration. In this study, effects contents (0.1 0.25 wt.%) on microstructure and mechanical properties alloy were studied. results showed that could refine grains, when was greater wt.%, size not uniform, number ...

This study focused on the use of microbial potential for metal ion removal. Scenedesmus obliquus and Synechocystis sp. PCC 6803 were compared for accumulation of Cu in batch mode. During time course accumulation, S. obliquus accumulated Cu up to 124 μg mg -1 dry wt after 1h of incubation, whereas for Synechocystis sp. PCC 6803 it reached up to 64.9 μg mg -1 dry wt after 2h. Low biomass concentr...