Wolframcarbid

Bezeichnung:Wolframcarbid

CAS-Nr12070-12-1

Englisch Name:Tungsten carbide

CBNumberCB5174366

SummenformelCW

Molgewicht195.85

MOL-Datei12070-12-1.mol

Synonyma

Wolframcarbid

Wolframcarbid physikalisch-chemischer Eigenschaften

Schmelzpunkt	2870°C
Siedepunkt	6000°C
Dichte	15,63 g/cm³
Löslichkeit	insoluble in H2O; soluble in HNO3/HF
Aggregatzustand	powder
Farbe	Gray
Wichte	15.63
Widerstand (resistivity)	19.2 (ρ/μΩ.cm)
Wasserlöslichkeit	Soluble in nitric acid and hydrofluroic acid. Insoluble in water.
Crystal Structure	Hexagonal
Merck	14,9815
Expositionsgrenzwerte	ACGIH: TWA 3 mg/m3 NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
IARC	2A (Vol. 86) 2006
EPA chemische Informationen	Tungsten monocarbide (12070-12-1)

Sicherheit

Kennzeichnung gefährlicher	T
R-Sätze:	23
S-Sätze:	22-24/25
RIDADR	UN3178
OEB	D
OEL	TWA: 0.015 mg/m3
WGK Germany	-
RTECS-Nr.	YO7250000
TSCA	Yes
HazardClass	4.1
PackingGroup	III
HS Code	28499020

Gefahreninformationscode (GHS)

Tungsten carbide Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
GRAUES BIS SCHWARZES PULVER.
ARBEITSPLATZGRENZWERTE
TLV (Wolfram und unlösliche Verbindungen): 5 mg/m?(als TWA); 10 mg/m?(als STEL) (ACGIH 2005).
MAK: IIb (nicht festgelegt, aber Informationen vorhanden) (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren schnell erreicht werden.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Risiko der Lungenschädigung bei wiederholter oder längerer Exposition gegenüber Staubpartikeln. Führt zu Fibrose.
LECKAGE
Verschüttetes Material in abdichtbaren Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel.
R-Sätze Betriebsanweisung:
R23:Giftig beim Einatmen.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
Gray powder. Mohs hardness of 9+ in solid form. Insoluble in water but readily attacked by a nitric acid– hydrofluoric acidmixture. Stable to 400C with chlorine, burns in fluorine at room temperature, oxidizes on heating in air.
Physikalische Eigenschaften
Gray powder, dissolved by HF=HNO₃mixture. Cutting tools, wear-resistant semiconductor film. Corroded by molten metals Mg, Al, V, Cr, Mn, Ni, Cu, Zn, Nb, and Mo. Corrosion resistant to molten Sn and Ta.
Verwenden
Tungsten carbide is extremely hard and are excellent cutting materials. It is used extensivly in the tool and die industry for drilling and cutting tools, sand blasting nozzels, armor-piercing bullets, and studs to increase traction of tires.
Besides, it is used in dental burs, surgical instruments, wear-resistant coatings; in manufacture of cemented carbide; Substitute for noble metals in catalysis.
Verwenden
Tungsten carbide is extensively used as a cutting tool for machining and in armor-piercing ammunition. It is also used in farriery, the shoeing of horses as well as to improve traction on slippery surfaces like roads or ice. It finds application in nuclear reactors as an effective neutron reflector. It is also used for making surgical instruments meant for open surgery such as scissors, forceps, hemostats, blade-handles and in laparoscopic surgery instruments such as graspers, cutter, needle holder and cautery. Further, it also used to make the rotating ball in the tips of ballpoint pens, bridal jewelry, and gauge blocks, which is useful for producing precision lengths in dimensional metrology.
Verwenden
Tungsten Carbide/Carbon (WC/C) is a black-gray colored coating of hard tungsten carbide particles in a soft amorphous carbon matrix. It is used for precision components with abrasive and adhesive wear, seizure problems (poor lubrication) and for dry machining applications.
Definition
A black powder,WC, made by heating powderedtungsten metal with lamp black at1600°C. It is extremely hard (9.5 onMohs’ scale) and is used in dies andcutting tools. A ditungsten carbide,W₂C, also exists.
Definition
A ditungsten carbide, W2C, with similar physical properties is also known. WC is said to be the strongest of all structural materials.
Hazard
Toxic by inhalation.
Flammability and Explosibility
Not classified
Industrielle Verwendung
Tungsten carbide with a 3 to 20% matrix ofcobalt is the most common structural RHM. Thelow-cobalt grades are used for applicationsrequiring wear resistance; the high-cobalt gradesserve where impact resistance is required.
Sicherheitsprofil
Chronic inhalation causes lung damage in humans. Ignites at 600°C in nitrogen oxide atmospheres. Violent reaction with F2, ClF3, NOx, IF5, PbO2, NO2, N20. See also TUNGSTEN COMPOUNDS.
Filter für giftige stoffe
The initial threshold screening level (ITSL) for pure tungsten carbide is 50 μg/m 3 based on an 8 hour averaging time.

Tungsten carbide Upstream-Materialien And Downstream Produkte

Wolframcarbid Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

12070-12-1, Tungsten carbide Verwandte Suche:

Send Inquriy