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'''Vanadium carbide''' |
'''Vanadium carbide''' is the [[inorganic compound]] with the formula [[Vanadium|V]][[Carbide|C]]. It is an extremely [[hardness|hard]] [[refraction (metallurgy)|refractory]] [[ceramic]] material. WIth a hardness of 9-9.5 Mohs, it is possibly the hardest metal-carbide known.<ref>http://www.ppm.bc.ca/Cermet_Carbide_Nitride_Powder_Products.html</ref>). It is of interest because it is prevalent in vanadium metal and alloys.<ref name=Ullmann>Günter Bauer, Volker Güther, Hans Hess, Andreas Otto, Oskar Roidl, Heinz Roller, Siegfried Sattelberger "Vanadium and Vanadium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. {{DOI|10.1002/14356007.a27_367}}</ref> |
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==Structure and preparation== |
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Vanadium carbide is chemically stable and has excellent high-temperature property. It can be used as an additive to [[tungsten carbide]] to fine the carbide crystals to improve the property of the [[cermet]]. Vanadium carbide can be formed in the (111) orientation, when formed by radio frequency magnetron sputtering. Although vanadium carbide is a very thermodynamically stable ceramic, V<sub>2</sub>C is energy favorable to exist at temperatures above 900°C. |
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Being isomorphous with vanadium monoxide, it crystallizes in the rock salt structure. Because VC and VO are miscible, samples of VC typically contain an impurity of the oxide.<ref name=Ullmann/> It is produced by heating vanadium oxides with carbon at around 1000 °C. Vanadium carbide can be formed in the (111) orientation, when formed by radio frequency magnetron sputtering. Although VC is thermodynamically stable, it converts to V<sub>2</sub>C at higher temperatures. |
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Vanadium carbide is used as an additive to [[tungsten carbide]] to fine the carbide crystals to improve the property of the [[cermet]]. |
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==References== |
==References== |
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Revision as of 19:21, 2 September 2013
Names | |
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Other names
Vanadium Carbon
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Identifiers | |
ECHA InfoCard | 100.031.917 |
PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
VC | |
Molar mass | 62.953 g/mol |
Appearance | refractory black cubic crystals |
Density | 5.77 g/cm3 |
Melting point | 2810 °C |
insoluble | |
Structure | |
cubic, cF8 | |
Fm3m, No. 225 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Vanadium carbide is the inorganic compound with the formula VC. It is an extremely hard refractory ceramic material. WIth a hardness of 9-9.5 Mohs, it is possibly the hardest metal-carbide known.[2]). It is of interest because it is prevalent in vanadium metal and alloys.[3]
Structure and preparation
Being isomorphous with vanadium monoxide, it crystallizes in the rock salt structure. Because VC and VO are miscible, samples of VC typically contain an impurity of the oxide.[3] It is produced by heating vanadium oxides with carbon at around 1000 °C. Vanadium carbide can be formed in the (111) orientation, when formed by radio frequency magnetron sputtering. Although VC is thermodynamically stable, it converts to V2C at higher temperatures.
Vanadium carbide is used as an additive to tungsten carbide to fine the carbide crystals to improve the property of the cermet.
References
- ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–93, ISBN 0-8493-0594-2
- ^ http://www.ppm.bc.ca/Cermet_Carbide_Nitride_Powder_Products.html
- ^ a b Günter Bauer, Volker Güther, Hans Hess, Andreas Otto, Oskar Roidl, Heinz Roller, Siegfried Sattelberger "Vanadium and Vanadium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a27_367