Vanadiumcarbid

Bezeichnung:Vanadiumcarbid

Englisch Name:Vanadium carbide

CBNumberCB6332572

SummenformelCV

Molgewicht62.95

Synonyma

Vanadiumcarbid

Vanadiumcarbid physikalisch-chemischer Eigenschaften

Schmelzpunkt	2810°C
Siedepunkt	3900℃ [KIR83]
Dichte	5.77 g/mL at 25 °C(lit.)
Löslichkeit	insoluble in H2O
Aggregatzustand	powder
Wichte	5.77
Farbe	Black
Widerstand (resistivity)	65.0–98.0 (ρ/μΩ.cm)
Wasserlöslichkeit	Insoluble in water.
Crystal Structure	Cubic, NaCl Structure
Expositionsgrenzwerte	NIOSH: TWA 1 mg/m3; STEL 3 mg/m3; Ceiling 0.05 mg/m3
EPA chemische Informationen	Vanadium carbide (VC) (12070-10-9)

Sicherheit

Kennzeichnung gefährlicher	Xn
R-Sätze:	20/21/22
S-Sätze:	36
RIDADR	UN3178
WGK Germany	3
TSCA	Yes
HazardClass	4.1
PackingGroup	III

Gefahreninformationscode (GHS)

R-Sätze Betriebsanweisung:
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
S-Sätze Betriebsanweisung:
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
Crystal. Mohs hardness 2800 kg/sq mm, resistivity 150 μΩ?cm (room temperature).
Physikalische Eigenschaften
Black crystals soluble in HNO₃with decomposition. Wear resistant film, cutting tools. Resistant to oxidation in air up to 300°C.
Verwenden
Alloys for cutting tools, steel additive.
Verwenden
Vanadium carbide (VC) is used to alloy iron to produce high-speed, high-temperature cutting tools for cutting metals and other hard substances.
Verwenden
Vanadium carbide (VC) and niobium carbide (NbC) are also extremely hard refractory materials. VC can be used as an additive to tungsten carbide (WC) to refine the carbide crystals and to improve the property of the cermet. TiC, ZrC, VC and NbC are commercially used in tool bits for cutting tools.
Vorbereitung Methode
V + C = VC
The reactants, preferably in finely subdivided form, are intimately mixed and, if needed, also compressed into pellets. The reaction is then carried out in a high vacuum. At a temperature of 1300°C, approximately 24 hours, or at 2000 ℃ about 15 minutes, are required for homogenization of the product. The reaction is best carried out in a graphite crucible.
Flammability and Explosibility
Non flammable