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Zirconia vs. Synthetic Sapphire

Both zirconia and synthetic sapphire are 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.

For each property being compared, the top bar is zirconia and the bottom bar is synthetic sapphire.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1260 to 3080
2700
Elastic (Young's, Tensile) Modulus, GPa 190 to 200
450
Flexural Strength, MPa 630 to 970
1090
Fracture Toughness, MPa-m1/2 8.0 to 11
1.9
Knoop Hardness 1210 to 1300
1860
Poisson's Ratio 0.25 to 0.29
0.28
Tensile Strength: Ultimate (UTS), MPa 410 to 450
2470

Thermal Properties

Maximum Temperature: Mechanical, °C 500 to 1330
2000
Specific Heat Capacity, J/kg-K 400 to 510
760
Thermal Conductivity, W/m-K 2.2 to 4.3
30
Thermal Expansion, µm/m-K 8.8 to 9.5
5.3

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 28
10
Dielectric Strength (Breakdown Potential), kV/mm 7.7 to 9.0
9.9
Electrical Resistivity Order of Magnitude, 10x Ω-m 4.5 to 11
17

Otherwise Unclassified Properties

Density, g/cm3 5.7 to 6.0
4.0

Common Calculations

Stiffness to Weight: Axial, points 19
63
Stiffness to Weight: Bending, points 33 to 34
64
Strength to Weight: Axial, points 19 to 22
170
Strength to Weight: Bending, points 21 to 23
100
Thermal Diffusivity, mm2/s 0.73 to 1.8
9.9
Thermal Shock Resistance, points 15 to 19
74