Tungsten Reduction Hydrogen

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Reduction of Oxide Minerals by Hydrogen Plasma: An Overview

The process of reduction of tungsten oxide in hydrogen arc plasma using linear plasmatron (300 kW) and a direct-flow reactor has been developed on semi-industrial scale (INET, VNIITS, VNIIETO, USSR) . By rapid cooling (quenching) metallic tungsten powder as globular particulates with a specific surface of 10–12 m 2 /g was produced. After ...

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Regulation of particle size and morphology of tungsten powders in

In the industrial production, the tungsten powders are mainly produced by the hydrogen reduction of tungsten oxides [14].The temperature and the water vapor partial pressure are the main factors influencing the hydrogen reduction of tungsten oxides [5].The reduction process is accompanied by a chemical vapor transport process, especially at high temperature.

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Preparation of nano-crystalline tungsten powders from gaseous WO

The industrial production of tungsten powder is carried out by the reduction of tungsten oxide powder via hydrogen. In this process, the size of the W particles is limited to particle sizes larger than 100 nm. To get below this limit, alternative processes are needed. In the current work, the possibility of preparing W powder below 100 nm via a vapour phase …

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The reduction of tungsten-VI-oxide to tungsten: A …

The purpose of this work is to add further details to the course of the hydrogen reduction reaction from tungsten-VI-oxide to tungsten powder. The investigations have been carried out under conditions far away from technical processes. The reduction has been studied by thermogravimetry forcing a thermodynamic reaction control by the use of tiny ...

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Eindhoven University of Technology MASTER Reduction of …

Reduction of tungsten oxide using a hydrogen plasma Rasulyaar, Parwez Award date: 2021 Link to publication Disclaimer This document contains a student thesis (bachelor's or master's), as authored by a student at Eindhoven University of Technology. Student theses are made available in the TU/e repository upon obtaining the required degree.

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Environmentally safe fluoride cycle in tungsten technology

A fluoride cycle in tungsten technology is based on three processes: (i) electrochemical decomposition of HF in the KHF 2 + HF melt at 80–100°C with the separate evolution of gaseous fluorine and hydrogen; (ii) fluorination of the tungsten powder with evoluated fluorine at 300–350°C with the condensation of formed WF 6 in a liquid form at t = 2.5–3.0°C, …

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Hydrogen Reduction

An alternate method of producing metallic tungsten from WO 3 via hydrogen reduction is the use of a rotary furnace (Lassner & Schubert, 1999). The primary benefit of using a rotary furnace is the removal of the static powder bed. The powder in the rotary furnace tube is constantly tumbled as it progresses through the furnace, constantly ...

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Tungsten Carbide/Tungsten Oxide Catalysts for Efficient

Catalyzing hydrogen evolution reaction (HER) is a key process in high-efficiency proton exchange membrane water electrolysis (PEMWE) devices. To replace the use of Pt-based HER catalyst, tungsten carbide (W2C) is one of the most promising non-noble-metal-based catalysts with low cost, replicable catalytic performance, and durability. However, the …

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Sequential oxidation and reduction of tungsten/tungsten oxide

The reduction of oxide films on the surface of tungsten was studied. The oxide films were created by briefly exposing smooth W foils to oxygen plasma generated using a microwave discharge at 500 W and an oxygen pressure of 40 Pa. Oxidation resulted in the formation of a WO 3 film with a thickness of approximately 1700 nm. The oxidised samples …

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Study on hydrogen adsorption on WO3(001) surface by density

Hydrogen reduction of tungsten oxide is currently the most widely used technology to produce metal tungsten for its simplicity and pollution-free nature. The computer simulation is a powerful tool for exploring the mechanism of hydrogen reduction of tungsten oxide from a microscopic view. The density functional theory (DFT) is applied to investigate the adsorption …

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Evolution of reduction process from tungsten oxide to ultrafine

1 Introduction. Tungsten is widely used in products across the high density alloy [1,2], shielding material [3,4], photocatalyst [], and cemented carbides [].WC-Co-cemented carbides with ultrafine or nanocrystalline grains are widely employed in the precision machining field [7,8,9].The reduction step from tungsten oxide to pure tungsten powder is critical to determine the final …

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A Porous Tungsten Substrate for Catalytic Reduction of Hydrogen …

Selective dissolution of a tungsten (85 wt.%)–rhenium (15 wt.%) alloy with rhenium in hydrochloric acid at the temperature of 298 K and anodic polarization modes was carried out to develop a porous catalytic substrate and to recycle rare metals. The parameters of the effective selective anodic dissolution of the tungsten–rhenium alloy, including the differences in applied …

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Hydrogen retention and affecting factors in rolled tungsten: …

Hydrogen isotope retention of tungsten in nuclear fusion reactors is one of the hot research issues all along. In this paper, tungsten samples in different rolled surfaces were polished by mechanical processing, subsequently subjected to D 2 + irradiation and thermal desorption. To better understand the experimental observations, this study also performed …

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Hydrogen reduction characteristics of WO3 based on density …

Hydrogen reduction of tungsten oxide has the widest application in many tungsten powder preparation for its series of advantages (simple equipment, mature technics, and less introducing impurities) [14]. However, as far as we know, the studies on the mechanism of hydrogen reduction have seldom been reported and are still unclear [15]. As a ...

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