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Mullite vs. Boron Carbide

Mullite belongs to the oxide-based engineering ceramics classification, while boron carbide belongs to the non-oxide engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is mullite and the bottom bar is boron carbide.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 800
1710 to 2200
Elastic (Young's, Tensile) Modulus, GPa 110 to 170
240 to 460
Flexural Strength, MPa 130 to 160
170 to 410
Fracture Toughness, MPa-m1/2 2.0
2.5 to 3.5
Knoop Hardness 750
2600 to 3200
Poisson's Ratio 0.25
0.17 to 0.19
Tensile Strength: Ultimate (UTS), MPa 160
350

Thermal Properties

Maximum Temperature: Mechanical, °C 1680
1000 to 2500
Specific Heat Capacity, J/kg-K 950
950
Thermal Conductivity, W/m-K 3.5 to 11
31 to 90
Thermal Expansion, µm/m-K 5.8
4.5 to 5.6

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.3
6.4
Electrical Resistivity Order of Magnitude, 10x Ω-m 10 to 11
0 to 11

Otherwise Unclassified Properties

Density, g/cm3 2.7 to 3.0
2.1 to 2.7

Common Calculations

Stiffness to Weight: Axial, points 22 to 31
63 to 100
Stiffness to Weight: Bending, points 58 to 62
91 to 100
Strength to Weight: Axial, points 15 to 17
37 to 47
Strength to Weight: Bending, points 22 to 24
42 to 53
Thermal Diffusivity, mm2/s 1.4 to 3.7
16 to 38
Thermal Shock Resistance, points 12 to 19
9.7 to 20