Inorganic Materials, volume 44, issue 9, pages 954-959
Determination of oxygen in W-C-Co nanopowders
Publication type: Journal Article
Publication date: 2008-08-30
Journal:
Inorganic Materials
Quartile SCImago
Q3
Quartile WOS
Q4
Impact factor: 0.8
ISSN: 00201685, 16083172
Materials Chemistry
Metals and Alloys
Inorganic Chemistry
General Chemical Engineering
Abstract
The oxygen content of W-C-Co nanopowders produced by plasma reduction of WO3, followed by low-temperature carburization in hydrogen has been determined by carrier gas hot extraction. The oxygen in adsorbed water, carbon-oxygen complexes weakly bound to the surface, and surface oxides (WO x and CoO x ) has been determined separately. Freshly prepared, passivated WC and WC + 8% Co powders with a specific surface area of 6–11 m2/g were found to contain 0.03–0.07 μg/cm2 of oxygen, not counting adsorbed water. Strongly bound oxygen in the form of surface oxides accounts for at least 80% of the total oxygen. These oxygen contents are equivalent to surface coverages from 1.2 to 2.5 oxygen monolayers (monolayer density of 1015 at/cm2). The water content varies from 0.15 to 0.3%, which corresponds to a water film no thicker than a monolayer. All of the water is physisorbed. The products of the plasma reduction of WO3 have a complex phase composition (W2C, WC1 − x , W, α-WC) and a specific surface area from 21 to 24 m2/g. In spite of the high content of the readily oxidizable phases W and W2C, the plasma-synthesized mixtures have submonolayer surface coverages with oxygen. They are protected from air oxidation by thin (one to three monolayers) pyrolytic carbon films, while the small amount of oxygen present originates from unreacted particles. In dry air, the powders oxidize insignificantly. At 100% humidity, stoichiometric WC powders are the most stable, while WC + 8% Co shows the lowest stability. The oxidation rate of W-C powders is proportional to the overall content of W and W2C.
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Krasovskii P. V., Blagoveshchenskii Yu. V., Grigorovich K. V. Determination of oxygen in W-C-Co nanopowders // Inorganic Materials. 2008. Vol. 44. No. 9. pp. 954-959.
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Krasovskii P. V., Blagoveshchenskii Yu. V., Grigorovich K. V. Determination of oxygen in W-C-Co nanopowders // Inorganic Materials. 2008. Vol. 44. No. 9. pp. 954-959.
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TY - JOUR
DO - 10.1134/S0020168508090100
UR - https://doi.org/10.1134%2FS0020168508090100
TI - Determination of oxygen in W-C-Co nanopowders
T2 - Inorganic Materials
AU - Krasovskii, P V
AU - Blagoveshchenskii, Yu V
AU - Grigorovich, K V
PY - 2008
DA - 2008/08/30 00:00:00
PB - Pleiades Publishing
SP - 954-959
IS - 9
VL - 44
SN - 0020-1685
SN - 1608-3172
ER -
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@article{2008_Krasovskii,
author = {P V Krasovskii and Yu V Blagoveshchenskii and K V Grigorovich},
title = {Determination of oxygen in W-C-Co nanopowders},
journal = {Inorganic Materials},
year = {2008},
volume = {44},
publisher = {Pleiades Publishing},
month = {aug},
url = {https://doi.org/10.1134%2FS0020168508090100},
number = {9},
pages = {954--959},
doi = {10.1134/S0020168508090100}
}
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Krasovskii, P. V., et al. “Determination of oxygen in W-C-Co nanopowders.” Inorganic Materials, vol. 44, no. 9, Aug. 2008, pp. 954-959. https://doi.org/10.1134%2FS0020168508090100.
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