Chromium alloys are a promising class of materials for high temperature application. In this work we investigated the microstructure, hot hardness and sliding wear resistance against an Al2O3 counter-body of three Chromium-Nickel (CrNi) alloys. The microstructure of the investigated alloys consi...

Nickel-chromium coatings were deposited on Zr1Nb alloy using magnetron sputtering systems with «hot» Ni and cooled Cr targets. The effect of coating composition on high-temperature oxidation resistance and hydrogen uptake of Zr1Nb was studied. Hydrogen uptake of the alloy was measured in situ un...

High MgO content and the dehydroxylation of laterite ore particles lead to poor compressive strength of fired chromium-nickel bearing iron ore pellets at natural basicity. For improving the compressive strength of the fired chromium‑nickel bearing iron ore pellets, burnt lime was applied as the ...

The corrosion behaviour of microporous nickel-chromium systems was studied by means of conventional electrochemical techniques and localized ones using two chloride based electrolytes with and without cupric ions in their composition. The conscious combination of different methodologies using th...

Metal bonded diamond tools are normally manufactured by hot-press sintering, which is a high energy consuming process and using a large number of graphite moulds as well. Graphite dust is hazardous to operator's health and environment in machining of graphite mould. In present study, a meta...

Aerobic reductive dissolution (AeRD) of iron, nickel, cobalt and manganese from laterite overburden using Acidithiobacillus (At.) thiooxidans and anaerobic reductive dissolution (AnRD) using At. ferrooxidans were examined in laboratory bioreactors. A chemical mobilization of ferric iron occurred...

Low-cost and highly efficient catalysts toward oxygen reduction reaction (ORR) are extremely required for the rapid development of Al-air batteries. Herein, novel trace-iron doped manganese oxide/N-doped ketjenblack carbon composites (Fe–MnOx/N–KB) were prepared by a facie and scalable route u...

Spin scattering characteristics of nickel doped with manganese are compared to nickel doped with iron and chromium in nickel. Conclusions are made based on the spin characteristics of the nickel samples doped with manganese with varying percentages in a host nickel crystal. Manganese doping incr...

The paper considers the effect of sintering and copper infiltration processes on pseudoalloys nickel-molybdenum steel-copper structure and mechanical properties. The study is based on PZhR 3.200.28 and ASC 100.29 iron powders usage.Using iron powder ASC 100.29, that is less contaminated with rel...

The main stages of a novel hydro-electrometallurgical technology for simultaneous production of electrolytic manganese metal, electrolytic γ-MnO2, and manganese sulfate monohydrate (MnSO4∙H2O) were tested at a large laboratory scale. The unified flow sheet comprised large and small process loop...

The integration of nanotechnology and membrane technology has led to the development of nanocomposite membranes that endowed with outstanding performances for arsenic removal in water system. In this study, a novel adsorptive nanocomposite membrane was fabricated by incorporating novel hydrous i...

In the frame of this work complexes of selected 3d transition metals with 2,3-pyrazinedicarboxylic acid were synthesized and characterized by spectroscopic (IR, Raman) and thermal (TGA, DSC) methods. FT-IR and FT-Raman spectra of 3d metal 2,3-pyrazinedicarboxylates were recorded and analyzed in ...

The effectiveness and mechanism of dimethyldithiocarbamate (DDTC) for recovering low-grade cobalt and nickel from the lixivium of a manganese-rich slag have been investigated via a computational and experimental study. First principles calculations using a solvation model showed that DDTC can ef...

The paper describes a process for the recovery of manganese and nickel from the sulfuric acid leach liquor of Indian Ocean manganese nodules using starch as the reductant. The leach liquor contained 22.85 g/L manganese, 6.38 g/L iron, 1.01 g/L copper, 0.023 g/L zinc, 0.09 g/L cobalt and 1.44 g/L...

Elements such as zinc, copper, nickel, and arsenic pose a concern for drinking water quality and ecosystem health and tracking these often nonpoint source contaminants in groundwater presents a significant challenge due to the heterogeneous spatial distribution of sources. Developing an approach...

In zirconium alloys, precipitation of a hydride generally introduces internal stresses in the surrounding matrix. This study aims at understanding the role of internal stresses on the formation, growth and arrangement of δ-hydrides in α-zirconium. To this end, a Fast Fourier Transform based di...

The oxidation kinetics of zirconium hydride powder in air was studied over the temperature range of 100–300 °C. The oxidation kinetic parameters were obtained and a controlling mechanism was proposed. The XPS depth profile analysis was consistent with a layered structure of the oxide film. The...

The combined method of first principles calculations with structure searching is employed to study the phase stability of stoichiometric ZrHx system with x = 1–3. A new zirconium hydride structure of P63/mmc ZrH3 is predicted to be thermodynamically stable at ambient pressure. Compared to ZrH a...

The thermal expansion coefficient of δ hydrides and the evolution of the d-spacing of δ hydride platelets in Zircaloy-4 during heat treatments were investigated by conducting synchrotron x-ray diffraction experiments. Identical experiments enabled a direct comparison of the d-spacing of δ zir...

Zircaloy-4 specimens were H-charged up to 1230 wppmH. Intra-, inter- and trans-granular zirconium hydride precipitates (or ZrH2−x where 1/(2 − x) is the Zr/H molar ratio) were observed throughout the α-Zr matrix. Transmission Electron Microscopy and electron diffraction confirmed that the ZrH2−...