On the minimum oxygen impurity content in tungsten powders

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A theoretical assessment of the minimum oxygen content in tungsten powder was carried out and compared with experimental results for passivated powder. The assumption of particles being spherical in size and distributed according to a lognormal law was used. Using this method, the thickness of the oxide layer in tungsten powders recovered at temperatures of 650, 800 and 950 °С (and with average size 1.53, 2.26 and 4.54 μm) was estimated and it turns out to be much larger than the monomolecular layer: 50, 10, 5 nm, respectively.

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作者简介

M. Alymov

Merzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: alymov.mi@gmail.com

Corresponding Member of the RAS

俄罗斯联邦, Chernogolovka, Moscow Region

S. Rogachev

Merzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences

Email: rogachevsa@gmail.com
俄罗斯联邦, Chernogolovka, Moscow Region

A. Ankudinov

Merzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences

Email: alymov.mi@gmail.com
俄罗斯联邦, Chernogolovka, Moscow Region

A. Samokhin

Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences

Email: alymov.mi@gmail.com
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Scheme of a retort for powder recovery.

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3. Fig. 2. Distribution of tungsten particles by size: dotted lines – experimental data, solid lines – approximation by lognormal distribution: recovery at a temperature of 650 °C (curve 1), at 800 °C (curve 2), at 950 °C (curve 3).

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4. Fig. 3. X-ray diffraction patterns of tungsten powders reduced at temperatures of 650, 800 and 950 °C.

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5. Fig. 4. SEM images of reduced tungsten powders: reduction at 650 (a), 800 (b) and 950 °C (c).

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6. Fig. 5. Calculated oxygen content depending on the thickness of the oxide layer on the particles of reduced tungsten powders: reduction at 650 (curve 1); 800 (curve 2); 950 °C (curve 3).

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7. Fig. 6. Cumulative curves of oxygen accumulation by fractions: recovery at 650 (curve 1), 800 (curve 2), 950 °C (curve 3).

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