Al2O3

ZrO2

Physical Properties

Chemical composition

99.8% Al203

+3% Y203

Crystalline structure

Corundum

Tetragonal

Sintered grain size (microns)

1- 3 microns

< 0.5 micron

Sintered density

3.92 g/cm3

6.03 g/cm3

water absorption

0

0

Mechanical properties at 20 °C

Vickers hardness (Hv 0.1)

1800-2000

1300-1500

Bending strength (N/mm2)

200-600

1000-1500

Young's modulus (N/mm2)

3.8X105

2.0x105

Fracture toughness: K1c 1/2 (Mpa.m)

4-5

8-15

Thermal Properties

Dilatation coef. From 20 °C to 2000 °C

8.4x10 -6

8.0x10-6

Thermal conductivity at 20 °C (W/m.K)

40

2.5-2.8

Thermal Shock resistance (°C)

200

400

Electrical Properties

Resistivity at 20°C (ohm .cm)

>1014

>1014