Ultrafine Tungsten Powder Obtained with Violet Tungsten Oxide Using Circulatory Oxidization-Reduction Method

Xiao Ming Fu

doi:10.4028/www.scientific.net/AMM.127.101

Paper Titles

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A Role of Low Energy Grain Boundaries in the Abnormal Grain Growth in Fe-3%Si Alloy
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Effects of Hot Band Annealing on the Precipitation of Copper Sulfide in Fe-3%Si Steel
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Ultrafine Tungsten Powder Obtained with Violet Tungsten Oxide Using Circulatory Oxidization-Reduction Method
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Straightness of U75V 100m Heavy Rail under Deferent Straightening Processes
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Material Selection and Application of Abrasive-Liquid Device Sealing Bush
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A Description Method for MSER with SIFT Descriptor
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Study on the Crack Initiation Criterion in Fretting Fatigue of LZ50 Steel
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 127Ultrafine Tungsten Powder Obtained with Violet...

Ultrafine Tungsten Powder Obtained with Violet Tungsten Oxide Using Circulatory Oxidization-Reduction Method

Abstract:

Violet tungsten oxide is prepared with pure ammonium paratungstate in the argon gas. Tungsten powder is obtained with violet tungsten oxide through deoxidation in the hydrogen gas (Rate of purity: 99.99 %, dew point: -40 °C), and tungsten powder is oxidized in the air. Tungsten oxide is reduced with tungsten powder in the hydrogen gas. The samples are characterized with the laser particle size distribution measuring instrument and field-emission scanning electron microscope. The results show that ultrafine tungsten powder is obtained through circulatory oxidation twice and reduction three times. The percentage of the particle size distribution of ultrafine tungsten powder is 95.73 % between 0.1 μm and 1.0 μm.