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Titanium boride

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Titanium Diboride
IUPAC name
 ?
General
Chemical formula TiB2
Molar mass 69.5 g/mol
Appearance metallic grey
CAS number 12045-63-5
MSDS Titanium boride MSDS
Other names
  • ?
Physical properties
Density and phase at STP 4.52 g/cm3 (?)
Solubility  ?
Specific gravity  ?
Crystal structure Hexagonal, Space group P6/mmm. Lattice parameters at room temperature: a=3.0236A, C=3.2204A
pH (10% solution with water)
(pKa)
 ?
Acidity constant
(pKa)
 ?
Thermal decomposition  ? K (? °C)
Phase behavior
Melting point 3225 +/- 20°CK (? °C)
Boiling point  ? K (? °C)
Triple point  ? K (? °C)
 ? bar
Critical point  ? K (? °C)
 ? bar
Heat of fusion
fusH)
 ? kJ/mol
Entropy of fusion
fusS)
 ? J/mol·K
Heat of vaporization
vapH)
 ? kJ/mol
Safety
Ingestion  ?
Inhalation  ?
Skin  ?
Eyes  ?
Flash point  ? °C
Autoignition temperature  ? °C
Explosive limits  ? - ?%
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
fH0solid)
 ? kJ/mol
Standard molar entropy
(S0solid)
 ? J/mol·K
Heat capacity
(Cp)
 ? J/mol·K
Density  ? g/cm3
Liquid properties
ΔfH0liquid  ? kJ/mol
S0liquid  ? 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.

Titanium Diboride (chemical formula TiB2) is an extremely hard ceramic compound (33 GPa) composed of titanium and boron that has excellent corrosion resistance at high temperatures and very good wear resistance. It does not occur naturally in the earth. Many TiB2 applications are inhibited by economic factors, particularly the costs of densifying a high melting point material. Current use of this material appears to be limited to specialized applications in such areas as impact resistant armor, cutting tools, crucibles and wear resistant coatings. It is also used as an inoculant to refine the grain size when casting aluminium alloys.

Thin films of TiB2 have a wide range of potential industrial applications due to the wear and corrosion resistance properties that TiB2 can provide to a cheap and/or tough substrate. The electroplating of TiB2 layers possess two main advantages compared with plasma (PVD, CVD) methods: the growing rate of the layer is 200 times higher (up to 5 μms−1) and the inconveniences of covering complex shaped products are dramatically reduced.

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