Control of carbon loss during synthesis of WC powder through ball milling of WO3-C-2Al mixture
سال
: 2009
چکیده: WC–Al2O3 composite powder potentially could be synthesized through milling of WO3–C–2Al mixture.
High temperature resulted from reduction ofWO3 by Al, activates the reduction reaction ofWO3 by C and
brings about carbon deficiency in the system which consequently causes the formation of undesirable
W2C phase. Hence, addition of excess amounts of C becomes necessary. The aim of the present study
has been to find out some appropriate routes for the fabrication of WC–Al2O3 composite powder from
WO3–2Al–C mixtures in such away that the formation ofW2C is prevented. Results of high energy milling
showed that the mode of reaction inWO3–2Al–C mixture is MSR (mechanically induced self-propagating
reaction). In this system, evolution of CO gas and high value of C loss were evidences for the need of
excess C. For samples produced via suggested routes, no CO evolution was observed and the amounts of
total carbon were constant. These observations showed that the proposed routes have been capable of
producing WC phase without the presence of W2C. Mechanism of the reactions in each route has been
discussed.
High temperature resulted from reduction ofWO3 by Al, activates the reduction reaction ofWO3 by C and
brings about carbon deficiency in the system which consequently causes the formation of undesirable
W2C phase. Hence, addition of excess amounts of C becomes necessary. The aim of the present study
has been to find out some appropriate routes for the fabrication of WC–Al2O3 composite powder from
WO3–2Al–C mixtures in such away that the formation ofW2C is prevented. Results of high energy milling
showed that the mode of reaction inWO3–2Al–C mixture is MSR (mechanically induced self-propagating
reaction). In this system, evolution of CO gas and high value of C loss were evidences for the need of
excess C. For samples produced via suggested routes, no CO evolution was observed and the amounts of
total carbon were constant. These observations showed that the proposed routes have been capable of
producing WC phase without the presence of W2C. Mechanism of the reactions in each route has been
discussed.
کلیدواژه(گان): WC,Fabrication,Carbon loss
کالکشن
:
-
آمار بازدید
Control of carbon loss during synthesis of WC powder through ball milling of WO3-C-2Al mixture
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| contributor author | M. Sakaki | en |
| contributor author | M. Sh. Bafghi | en |
| contributor author | جلیل وحدتی خاکی | en |
| contributor author | Q. Zhang | en |
| contributor author | F. Saito | en |
| contributor author | Jalil Vahdati Khaki | fa |
| date accessioned | 2020-06-06T14:08:36Z | |
| date available | 2020-06-06T14:08:36Z | |
| date issued | 2009 | |
| identifier uri | https://libsearch.um.ac.ir:443/fum/handle/fum/3384188 | |
| description abstract | WC–Al2O3 composite powder potentially could be synthesized through milling of WO3–C–2Al mixture. High temperature resulted from reduction ofWO3 by Al, activates the reduction reaction ofWO3 by C and brings about carbon deficiency in the system which consequently causes the formation of undesirable W2C phase. Hence, addition of excess amounts of C becomes necessary. The aim of the present study has been to find out some appropriate routes for the fabrication of WC–Al2O3 composite powder from WO3–2Al–C mixtures in such away that the formation ofW2C is prevented. Results of high energy milling showed that the mode of reaction inWO3–2Al–C mixture is MSR (mechanically induced self-propagating reaction). In this system, evolution of CO gas and high value of C loss were evidences for the need of excess C. For samples produced via suggested routes, no CO evolution was observed and the amounts of total carbon were constant. These observations showed that the proposed routes have been capable of producing WC phase without the presence of W2C. Mechanism of the reactions in each route has been discussed. | en |
| language | English | |
| title | Control of carbon loss during synthesis of WC powder through ball milling of WO3-C-2Al mixture | en |
| type | Journal Paper | |
| contenttype | External Fulltext | |
| subject keywords | WC | en |
| subject keywords | Fabrication | en |
| subject keywords | Carbon loss | en |
| journal title | Journal of Alloys and Compounds | en |
| journal title | Journal of Alloys and Compounds | fa |
| pages | 486-491 | |
| journal volume | 486 | |
| journal issue | 1 | |
| identifier link | https://profdoc.um.ac.ir/paper-abstract-1012420.html | |
| identifier articleid | 1012420 |