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Machinable Glass-ceramic vs. Boron Carbide

Machinable glass-ceramic belongs to the glass and glass-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 (5, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 2.7
2.1 to 2.7

Common Calculations

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