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Boron Carbide vs. Machinable Glass-ceramic

Boron carbide belongs to the non-oxide engineering ceramics classification, while machinable glass-ceramic belongs to the glass and glass-ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is boron carbide and the bottom bar is machinable glass-ceramic.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1710 to 2200
310
Elastic (Young's, Tensile) Modulus, GPa 240 to 460
67
Flexural Strength, MPa 170 to 410
96
Fracture Toughness, MPa-m1/2 2.5 to 3.5
2.5
Knoop Hardness 2600 to 3200
250
Poisson's Ratio 0.17 to 0.19
0.29
Tensile Strength: Ultimate (UTS), MPa 350
84

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 2500
760
Specific Heat Capacity, J/kg-K 950
790
Thermal Conductivity, W/m-K 31 to 90
1.2
Thermal Expansion, µm/m-K 4.5 to 5.6
21

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.7
2.7

Common Calculations

Stiffness to Weight: Axial, points 63 to 100
14
Stiffness to Weight: Bending, points 91 to 100
51
Strength to Weight: Axial, points 37 to 47
8.8
Strength to Weight: Bending, points 42 to 53
16
Thermal Diffusivity, mm2/s 16 to 38
0.56
Thermal Shock Resistance, points 9.7 to 20
4.3