Preparation of Medium-Sized Tungsten Particles via the New Method

Xiao Ming Fu

doi:10.4028/www.scientific.net/AMR.562-564.212

Paper Titles

Effects of Cryogenic Treatment on Micro-Mechanical Properties of a Cu-Al Alloy
p.196

Transformation Kinetics of α+γ₂ to ß in Cu-Al Alloy after Cryogenic Treatment
p.200

Microstructure and Properties of Boronized Layer Produced by Borosulphurizing Method
p.204

Material Texture Contourlet Retrieval by Energy and Variance Distribution Features
p.208

Preparation of Medium-Sized Tungsten Particles via the New Method
p.212

In Situ Observations of Lateral Growth Rate of δ- Phase during Solidification of Fe-0.2%C-0.6%Mn Steel
p.216

Waveband Selection with Stability for FTIR/ATR Spectroscopic Analysis of COD in Sugar Refinery Wastewater
p.220

Effect of Retrogression Time on the Mechanical Properties and Stress Corrosion Cracking Behavior of 7A60 Aluminum Alloy
p.227

Comparison of Thinning Features of a Hot and Cold Stamped Aluminium B-Pillar Model for Passenger Cars
p.234

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Preparation of Medium-Sized Tungsten Particles via the New Method

Abstract:

Medium-sized tungsten particles are obtained through circulatory oxidation-reduction twice. The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). Blue tungsten oxide (BTO) is prepared with ammonium paratungstate (APT) in the argon gas. Tungsten powders are obtained with BTO through deoxidation in the hydrogen gas (Rate of purity: 99.99%, dew point: -40°C), and tungsten powders are oxidized in the air. Tungsten oxide WO3) is reduced into tungsten powders in hydrogen gas again. The routes are repeated. The volume percent content of medium-sized tungsten powders between 3 μm and 10 μm is 83.86 %.