# Titanium Diboride (TiB_{2})

Titanium diboride is a non-oxide engineering ceramic. It has a very high density among non-oxide engineering ceramics. In addition, it has a moderately high fracture toughness and a moderately high heat capacity. The graph bars on the material properties cards below compare titanium diboride to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Compressive (Crushing) Strength

3540 *MPa* 510 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

290 *GPa* 41 *x 10 ^{6} psi*

Flexural Strength

380 *MPa* 55 *x 10 ^{3} psi*

Fracture Toughness

6.5 *MPa-m ^{1/2}* 5.9

*x 10*

^{3}psi-in^{1/2}Knoop Hardness

2800

Poisson's Ratio

0.11

Tensile Strength: Ultimate (UTS)

280 *MPa* 40 *x 10 ^{3} psi*

## Thermal Properties

Maximum Temperature: Mechanical

1270 *°C* 2320 *°F*

Maximum Thermal Shock

110 *°C* 230 *°F*

Specific Heat Capacity

870 *J/kg-K* 0.21 *BTU/lb-°F*

Thermal Conductivity

58 *W/m-K* 33 *BTU/h-ft-°F*

Thermal Expansion

8.0 *µm/m-K*

## Other Material Properties

Density

4.5 *g/cm ^{3}* 280

*lb/ft*

^{3}Electrical Resistivity Order of Magnitude

-6.5 *10 ^{x} Ω-m*

## Common Calculations

Stiffness to Weight: Axial

35 *points*

Stiffness to Weight: Bending

49 *points*

Strength to Weight: Axial

17 *points*

Strength to Weight: Bending

21 *points*

Thermal Diffusivity

15 *mm ^{2}/s*

Thermal Shock Resistance

8.7 *points*

## Followup Questions

## Further Reading

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015