| 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 (ΔfusH) |
? kJ/mol |
| Entropy of fusion (ΔfusS) |
? J/mol·K |
| Heat of vaporization (ΔvapH) |
? 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 | |
| |
| Solid properties | |
| Standard enthalpy change of formation (ΔfH0solid) |
? 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.