Vanadium carbide

Short description: Extremely hard refractory ceramic material

Vanadium carbide[1]

Names
Other names

Vanadium Carbon
Vanadium(IV) carbide

Identifiers

CAS Number

* 12070-10-9 Y

PubChem CID

* 159387

Properties

Chemical formula

| VC
Molar mass | 62.953 g/mol
Appearance  | refractory black cubic crystals
Density | 5.77 g/cm3
Melting point |  2,810 °C (5,090 °F; 3,080 K)

Solubility in water

| insoluble
Structure

Crystal structure

| cubic, cF8

Space group

| Fm3m, No. 225

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Y verify (what is YN ?)
Infobox references

Vanadium carbide is the inorganic compound with the formula VC. It is an extremely hard and 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 cemented carbide, to refine the carbide crystals and thereby get an increased hardness of the inserts.

## Physical properties

Vanadium Carbide has an elastic modulus of approximately 380 GPa.[4]

## References

1. ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–93, ISBN 0-8493-0594-2
2. ↑ "Ceramic and Cermet Composite Powders - PPM Ltd.". http://www.ppm.bc.ca/Cermet_Carbide_Nitride_Powder_Products.html.
3. ↑ 3.0 3.1 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
4. ↑ Hannink, R.; Murry, M. (1974). "Elastic moduli measurements of some cubic transition metal carbides and alloyed carbides". Journal of Materials Science 9 (2): 223–228. doi:10.1007/BF00550945. Bibcode: 1974JMatS...9..223H.

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Vanadium compounds

Vanadium(0)|

* V(CO)6

Vanadium(II)|

* VBr2
* VCl2
* VO
* VS

Vanadium(III)|

* VBr3
* VCl3
* VF3
* VI3
* VN
* V2O3
* V2(SO4)3
* V2S3

Vanadium(IV)|

* VC
* VO2
* VS2
* VCl4
* VF4

| Organovanadium(IV) compounds|

* VO(C5H7O2)2

|

Vanadyl(IV) compounds|

* VOSO4

Vanadium(V)|

* V2O5
* VOCl3
* VOF3
* VF5
* V2S5

| Vanadyl(V) compounds|

* VO(ClO4)3

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