Finely distributed structure of mechanically ground copper-lead powders.

Magnetic hysteresis of mechanically alloyed Smâ•fiCo nanocrystalline powders

Lead Levels in Powders of Surma (Kohl) Used in Kerman

Background & aims: Lead poisoning is a global problem and considered to be the most important environmental disease in children. Exposure to even low amounts of lead is dangerous. Lead containing eye make ups due to the long time contact with skin and eye mucosa can lead to blood and eye symptoms. The purpose of this study was to evaluate the amount of lead in powders of kohl in Kerman. Method:...

“Turbulent” electrical transport in copper powders

– Compressed copper powder has a very large electrical resistance (1MΩ), due to the oxide layer on grains (100μm). We observe that its voltage-current U -I characteristics are nonlinear, and undergo an instability, from an insulating to a conductive state at relatively small applied voltages. Current through the powder is then noisy, and the noise has interesting selfsimilar properties, includi...

Investigation of oxidation behavior and Thermal spray of mechanically milled CoNiCrAlY–YSZ powders

In this study, the effects of mechanical milling and YSZ reinforcing on oxidation behavior of CoNiCrAlY coatings were investigated. Various amounts of YSZ particles (0%, 5%, 10% and 15 wt.%) were mixed with commercial CoNiCrAlY powder and milled for 24 hrs. Then, the mechanically milled and commercial powders were deposited on Inconel 617 substrate using High Velocity Oxygen-Fuel (HVOF) process...

Production of Fe-C Powders with Improved Structure

Production of Fe-C alloy powders by mechanical alloying was studied. Fe and graphite elemental powder mixtures containing 0.8 and 1.5wt.% graphite were mechanically alloyed using a planetary ball mill. The structural changes of powder particles during mechanical alloying were studied by x-ray diffractometery, scanning electron microscopy and microhardness measurements. For both compositions, me...