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Alumina vs. Titanium Diboride

Alumina belongs to the oxide-based engineering ceramics classification, while titanium diboride belongs to the non-oxide engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is alumina and the bottom bar is titanium diboride.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1920 to 2750
3540
Elastic (Young's, Tensile) Modulus, GPa 220 to 370
290
Flexural Strength, MPa 260 to 430
380
Fracture Toughness, MPa-m1/2 3.7 to 7.2
6.5
Knoop Hardness 960 to 1660
2800
Poisson's Ratio 0.22 to 0.24
0.11
Tensile Strength: Ultimate (UTS), MPa 210 to 290
280

Thermal Properties

Maximum Temperature: Mechanical, °C 650 to 1730
1270
Maximum Thermal Shock, °C 200 to 300
110
Specific Heat Capacity, J/kg-K 870 to 940
870
Thermal Conductivity, W/m-K 14 to 30
58
Thermal Expansion, µm/m-K 6.7 to 8.2
8.0

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 6.2 to 14
-6.5

Otherwise Unclassified Properties

Density, g/cm3 3.4 to 4.1
4.5

Common Calculations

Stiffness to Weight: Axial, points 35 to 53
35
Stiffness to Weight: Bending, points 57 to 62
49
Strength to Weight: Axial, points 14 to 23
17
Strength to Weight: Bending, points 19 to 28
21
Thermal Diffusivity, mm2/s 3.7 to 10
15
Thermal Shock Resistance, points 4.9 to 14
8.7