| Identification | Back Directory | [Name]
TUNGSTEN CARBIDE | [CAS]
12070-12-1 | [Synonyms]
ncic61198
Wolframcarbid
Wolfram carbide
tungsten cabide
Tungsten carbid
TUNGSTEN CARBIDE
tungstencarbide(wc)
tungsten(iv) carbide
tungsten monocarbide
Tungsten carbide-200
Tungsten carbide,99%
TUNGSTEN CARBIDE: 99.5%
Tungsten carbide->2% Co
TUNGSTEN CARBIDE (99.5%-W)
Tungsten carbide-> .3% Ni
TUNGSTEN CARBIDE GRADE DS 100
TUNGSTEN CARBIDE MAS 3000-5000
41211, Tungsten carbide powder (O)
Tungsten carbide, 99% (metals basis)
Tungsten carbide, 93-94% + Co 6.5-7%
TUNGSTEN CARBIDE , POWDER, 30-100 MICRON
TUNGSTEN CARBIDE POWDER (O)(CRM STANDARD)
TUNGSTEN CARBIDE, POWDER, <10 MICRON, 99 %
TUNGSTEN CARBIDE GRADE HC 250-A PRODUCT OF HC STARCK | [EINECS(EC#)]
235-123-0 | [Molecular Formula]
CW | [MDL Number]
MFCD00011464 | [MOL File]
12070-12-1.mol | [Molecular Weight]
195.85 |
| Chemical Properties | Back Directory | [Definition]
A ditungsten carbide, W2C, with similar physical
properties is also known. WC is said to be the
strongest of all structural materials. | [Appearance]
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. | [Melting point ]
2870°C | [Boiling point ]
6000°C | [density ]
15,63 g/cm3 | [solubility ]
insoluble in H2O; soluble in HNO3/HF | [form ]
powder
| [color ]
Gray | [Specific Gravity]
15.63 | [Resistivity]
19.2 (ρ/μΩ.cm) | [Water Solubility ]
Soluble in nitric acid and hydrofluroic acid. Insoluble in water. | [Crystal Structure]
Hexagonal | [Merck ]
14,9815 | [Exposure limits]
ACGIH: TWA 3 mg/m3
NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 | [Uses]
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. | [IARC]
2A (Vol. 86) 2006 | [EPA Substance Registry System]
Tungsten monocarbide (12070-12-1) |
| Hazard Information | Back Directory | [Chemical Properties]
grey powder | [Hazard]
Toxic by inhalation. | [Flammability and Explosibility]
Notclassified | [Industrial uses]
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. |
| Safety Data | Back Directory | [Hazard Codes ]
T | [Risk Statements ]
23 | [Safety Statements ]
22-24/25 | [RIDADR ]
UN3178 | [WGK Germany ]
-
| [RTECS ]
YO7250000
| [TSCA ]
Yes | [HazardClass ]
4.1 | [PackingGroup ]
III | [HS Code ]
28499020 | [Safety Profile]
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. |
| Questions And Answer | Back Directory | [Physical properties]
Tungsten carbide is a dense, metal-like substance, light gray with a bluish tinge, that decomposes, rather than melts, at 2,600º C (4,700º F). Tungsten carbide has very high strength for a material so hard and rigid. Compressive strength is higher than virtually all melted and cast or forged metals and alloys; and is two to three times as rigid as steel and four to six times as rigid as cast iron and brass. High resistance to deformation and deflection is very valuable in those many applications where a combination of minimum deflection and good ultimate strength merits first consideration. For such a hard material with very high rigidity the impact resistance is high because it is in the range of hardened tool steels of lower hardness and compressive strength. It also performs well up to about 1000°F in oxidizing atmospheres and to 1500°F in non-oxidizing atmospheres; it undergoes no phase changes during heating and cooling, retains its stability indefinitely; and retains toughness and impact strength in the cryogenic temperature ranges. (-453°F.)
Tungsten carbide has exceptional resistance to galling and welding at the surface, and has sufficient resistance to corrosion-wear conditions for many applications. Tungsten carbide wears up to 100 times longer than steel in conditions including abrasion, erosion and galling. Wear resistance of tungsten carbide is better than that of wear-resistance tool steels.
| [Uses]
Industry
Application
Role/benefit
Mining
Making mining tips, drill bits, and other cutting and mining tools
Raw material/extreme hardness and resistance to wear and tear
Cutting and milling
Manufacture of mill products and cutting tools for machining
Raw material/extreme hardness, resistance to high temperature and good formability
Jewelry
Crafting rings, pendants, earrings and other jewelry
Raw material/extreme hardness and high resistance to scratching
Medicine
Manufacture of surgical instruments
Raw material/extreme hardness and high resistance to pitting and rusting
Ammunition
Armor-piercing ammunition
Raw material/combination of great hardness and very high density
Nuclear
Neutron reflector
Reflector material
Sports
Tips of ski pole
Raw material/increase resistance to wear and service life
Drive tracks of snowmobiles and motorcycle and bicycle tires
Catalyst
Production of water from hydrogen and oxygen at room temperature
Replacement of platinum
Reduction of tungsten trioxide by hydrogen in the presence of water
Isomerization of 2,2-dimethylpropane to 2-methylbutane
Hydrazine-powered satellite thrusters
Replacement of iridium
Others
Rotating ball in the tips of ballpoint pens
Extreme hardness and resistance to wear
Manufacture of gauge blocks
Common material
Guitar slide
Superior sustain and volume than other material slides
Catalytic and fuel cells
Electrode material
Light bulb filaments
Essential component/high temperature resistance and considerable period of using time
SEM probe and field emission electric device
High resolution and good oxidation resistance
| [Preparation]
Tungsten carbide is prepared by heating powdered tungsten with carbon black in the presence of hydrogen at 1,400o1,600o C (2,550o-2,900o F). For fabrication, a process developed in the 1920s is employed: the powdered tungsten carbide is mixed with another powdered metal, usually cobalt, and pressed into the desired shape, then heated to temperatures of 1,400o-1,600o C; the other metal, which melts, wets and partially dissolves the grains of tungsten carbide, thus acting as a binder or cement. The cemented composites of tungsten carbide-cobalt are known by many different trade names, including Widia and Carboloy. |
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