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Titanium boride

General
Titanium Diboride
IUPAC name ?
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=302.36 pm, C=322.04 pm
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 (Δ_fusH)	? kJ/mol
Entropy of fusion (Δ_fusS)	? J/mol·K
Heat of vaporization (Δ_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 (Δ_fH⁰_solid)	? kJ/mol
Standard molar entropy (S⁰_solid)	? J/mol·K
Heat capacity (C_p)	? J/mol·K
Density	? g/cm³
Liquid properties
Δ_fH⁰_liquid	? kJ/mol
S⁰_liquid	? J/mol·K
C_p	? J/mol·K
Density	? g/cm³
Gas properties
Δ_fH⁰_gas	? kJ/mol
S⁰_gas	? J/mol·K
C_p	? 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.

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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 μm·s⁻¹) and the inconveniences of covering complex shaped products are dramatically reduced.

Categories: Borides | Titanium compounds