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Boron Carbide vs. SiAlON

Both boron carbide and SiAlON are non-oxide engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1710 to 2200
2620
Elastic (Young's, Tensile) Modulus, GPa 240 to 460
290
Flexural Strength, MPa 170 to 410
680
Fracture Toughness, MPa-m1/2 2.5 to 3.5
6.3
Knoop Hardness 2600 to 3200
1700
Poisson's Ratio 0.17 to 0.19
0.23
Tensile Strength: Ultimate (UTS), MPa 350
190

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 2500
1200
Specific Heat Capacity, J/kg-K 950
880
Thermal Conductivity, W/m-K 31 to 90
19
Thermal Expansion, µm/m-K 4.5 to 5.6
3.6

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
9.3
Electrical Resistivity Order of Magnitude, 10x Ω-m 0 to 11
14

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.7
3.3

Common Calculations

Stiffness to Weight: Axial, points 63 to 100
50
Stiffness to Weight: Bending, points 91 to 100
67
Strength to Weight: Axial, points 37 to 47
16
Strength to Weight: Bending, points 42 to 53
22
Thermal Diffusivity, mm2/s 16 to 38
6.4
Thermal Shock Resistance, points 9.7 to 20
13