StarCeram® Z-Al Zirconium Dioxide (Zirconia, ZrO₂)



Z-Al is an yttria (yttrium oxide) and alumina (aluminum oxide) stabilized zirconia (zirconium oxide)



Density ρ

6 g/cm³ at 20 °C


Elastic modulus E

210 GPa at 20 °C

Flexural strength σbend

1100 MPa at 20 °C

min, 4-point bending, 40/20mm

Fracture toughness KIC

10 MPa·√m at 20 °C

Hardness, Vickers HV

1220 [-] at 20 °C

converted from 12 GPa

Weibull modulus mW

10 [-] at 20 °C



Coefficient of thermal expansion α

1.08E-5 1/K at 20 °C

RT - 1000°C

Max service temperature Tmax

800 °C

Thermal conductivity λ

2 W/(m·K) at 20 °C

Thermal shock parameter R1 R1

350 °C


Electrical resistivity ρel

1.00E+8 - 1.00E+13 Ω·m at 20 °C

Technological properties

Application areas

Air separator wheels, bearing bushes, protection sleeves, crucibles, cylinder linings, dose bushes, pistons, extruder screws, forming rolls, guide rolls, mill linings, nozzles, slide valves, rotors, wear protection parts, welding rolls, centering pins

This material data has been provided by KYOCERA Fineceramics Precision GmbH.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.