Physical Properties of Ceramics

MaterialsAl2O3 ZrO2
Main Constituent99.9%98%
Specific Gravity
3.97 g/cm36.07 g/cm3
Theoretical Density99.9% >99%
Open Porosity
0% 0%
Average Grain Size2-6 microns 0.5 microns
Hardness Vickers2000 HV 1300 HV
Hardness Mohs
Compressive Strength380.000 N/cm2 210.000 N/cm2
Bending Strength
40.000 N/cm2100.000 N/cm2
Modulus of Elasticity3,8 x 105 N/mm22,0 x 105 N/mm2
Tensile Strength300 N/mm21000 N/mm2
Fracture Toughness K1c4 MN/m3/28 MN/m3/2
Max. Operating Temperature
1900°C 1000°C
Coefficient of Thermal Expansion
8 (10-6/°C) 10 (10-6/°C)
Thermal Conductivity
40 W/mK 2.5 W/mK
Specific Heat900 J/Kg•°K 500 J/Kg•°K
Electrical Resistivity>1014-
Dielectric Constant at 1 Mhz
Dissipation Factor at 1kHz0.0007 -

*All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is offered for comparative purposes only.