Boron_carbide Boron_carbide

Boron carbide - Definition and Overview
Boron carbide
General
Chemical formula B4C
Molecular weight 55.25 amu
Appearance Dark gray or black solid or powder.
CAS number 12069-32-8 (B4-C)
MSDS Boron carbide MSDS
Other names
  • Tetrabor
  • B4-C
  • B4C
  • Black Diamond
Physical properties
Density and phase at STP 2.5 g/cm3 (?)
Solubility None
Specific gravity 2.51
Crystal structure Rhombohedral
Thermal decomposition  ? K (? °C)
Phase behavior
Melting point 2,623 K (2,350° C)
Boiling point 3,773 K (3,500° C)
Triple point  ? K (? °C)
 ? bar
Critical point  ? K (? °C)
 ? bar
Heat of fusion
(ΔfusH) 		 ? kJ/mol
Entropy of fusion
(ΔfusS) 		 ? J/mol·K
Heat of vaporization
(ΔvapH) 		 ? kJ/mol
Safety
Ingestion  ?
Inhalation  ?
Skin  ?
Eyes  ?
OSHA Permissible Exposure Limit
(PEL) 		 ? ppm
NIOSH Immediate Danger to Life and Health
(IDLH) 		 ? ppm
Precautions
  • Hazards:
    •  ?
  • Personal protection:
    •  ?
  • Reacts with:
    •  ?
  • Storage:
    •  ?
Solid properties
Standard enthalpy change of formation
(ΔfH0solid) 		-62.68 kJ/mol
Standard molar entropy
(S0solid) 		26.77 J/mol·K
Heat capacity
(Cp) 		 ? J/mol·K
Density 2.5 g/cm3
Liquid properties
ΔfH0liquid 51.88 kJ/mol
S0liquid 69.21 J/mol·K
Cp  ? J/mol·K
Density  ? g/cm3
Gas properties
ΔfH0gas  ? kJ/mol
S0gas  ? J/mol·K
Cp  ? J/mol·K

Except where noted, all data was produced under conditions of standard temperature and pressure.

Boron Carbide (chemical formula B4C) is an extremely hard ceramic material used in tank armor, bulletproof vests, and numerous industrial applications. With a hardness of 9.3 on the mohs scale, it is the fourth hardest material known behind cubic boron nitride, diamond, and ultrahard fullerite.

Discovered in the 19th Century as a bi-product of reactions involving metal Borides, it was not until the 1930s that the material was studied scientifically. Boron Carbide is now produced industrially by the carbo-thermal reduction of B2O3 in an electric arc furnace.

Applications

  • Personal and vehicle anti-ballistic armor plating.
  • Grit blasting nozzles.
  • High-pressure water jet cutter nozzles.
  • Scratch and wear resistant coatings.
  • Cutting tools and dies.
  • Abrasives.
  • Neutron absorber in Nuclear Reactors.

See Also

Example Usage of carbide
AgenzyCom: $129.99 - Tungsten carbide Mens Link Jewelry Diamond Bracelet Sz 9 http://agenzy.com/3w4b
msjlly: #8: Beveled edge Brush finish 9mm Comfort Fit Mens Tungsten carbide Wedding Band Ring Size 11 http://bit.ly/5v8KNW #discount
Lalgarh: @bhopalmedappeal #Ratan #Tata lobbied #Indian #Govt to go easy on #Union #carbide http://bit.ly/5oevyr
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