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- W2002544449 abstract "Starting from bulk carbides, the removal by hydrogen of free carbon, oxygen from passivation and from carbidic carbon was studied in temperature-programmed experiments. Treatment of WC1+x Oy with flowing hydrogen shows that the production of methane is maximum at about 700°C, above which it decreases. However, at the final pretreatment temperature, a residual partial pressure of methane is still observed, but this residual methane pressure decreases with temperature and disappears. After a few hours' treatment in hydrogen the final solid corresponds approximately to the stoichiometry WC without extra carbon. Such a treatment was monitored by X-ray diffraction in a diffractometer allowing temperature-programmed experiments from room temperature up to 900°C. It was shown that no metallic tungsten appears below 700°C. The amount of metal formed during treatment at 750°C is very small, and above 750°C it increases with temperature. However, even after a two hour treatment at 800°C, followed by treatment at 900°C, large proportions of carbide are maintained. No W2C formation is detected. W2C, after passivation, is very sensitive to hydrogen treatment, since a thermogravimetric experiment showed that, after a five hour treatment in hydrogen at 600°C, W2C was completely decarburized into W. W2C seems relatively stable at 400°C. A treatment of Mo2C containing large amounts of free carbon in hydrogen at 700°C leads to MoC0.47, that is, to clean Mo2C. On the other hand, Cr3C2 behaves differently in hydrogen since some decarburization occurs before complete elimination of excess free carbon. By temperature-programmed X-ray diffraction in a O2(2%)-N2 mixture from room temperature to 500°C, it is shown that oxidation of WC to WO3 starts at 400°C and is very fast at 500°C. No oxycarbides or intermediary oxides such as WO2 were detected." @default.
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- W2002544449 date "1995-01-01" @default.
- W2002544449 modified "2023-09-25" @default.
- W2002544449 title "Treatment of bulk group VI transition metal carbides with hydrogen and oxygen" @default.
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- W2002544449 doi "https://doi.org/10.1016/0926-860x(94)00203-7" @default.
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