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Machinable Glass-ceramic vs. Zirconia

Machinable glass-ceramic belongs to the glass and glass-ceramics classification, while zirconia belongs to the oxide-based engineering ceramics. There are 21 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 310
1260 to 3080
Elastic (Young's, Tensile) Modulus, GPa 67
190 to 200
Flexural Strength, MPa 96
630 to 970
Fracture Toughness, MPa-m1/2 2.5
8.0 to 11
Knoop Hardness 250
1210 to 1300
Poisson's Ratio 0.29
0.25 to 0.29
Tensile Strength: Ultimate (UTS), MPa 84
410 to 450

Thermal Properties

Maximum Temperature: Mechanical, °C 760
500 to 1330
Specific Heat Capacity, J/kg-K 790
400 to 510
Thermal Conductivity, W/m-K 1.2
2.2 to 4.3
Thermal Expansion, µm/m-K 21
8.8 to 9.5

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
28
Dielectric Strength (Breakdown Potential), kV/mm 27
7.7 to 9.0
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
4.5 to 11

Otherwise Unclassified Properties

Density, g/cm3 2.7
5.7 to 6.0

Common Calculations

Stiffness to Weight: Axial, points 14
19
Stiffness to Weight: Bending, points 51
33 to 34
Strength to Weight: Axial, points 8.8
19 to 22
Strength to Weight: Bending, points 16
21 to 23
Thermal Diffusivity, mm2/s 0.56
0.73 to 1.8
Thermal Shock Resistance, points 4.3
15 to 19