# 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).

## 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}* 5920

*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 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 *m ^{2}/s*

Thermal Shock Resistance

8.7 *points*

## Followup Questions

## Further Reading

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