Name 

Unit 

Alumina

Zirconia 

Content 

%

≥95

≥99

≥99.7

≥94

Density

G/cm3

3.65

3.80

3.90

6.00

Hardness (Hv0.5)

GPa 

13.1

15.0

17.1

13.2

Flexural strength

MPa≥

340

310

370

1000

Elasticity

  GPa

 300

 330

 350

 200

Poisson's ratio

 0.23

 0.23

 0.23

 0.30

Max Tem. 

°C≥

1400

1750

1800

1050

Heat expansion

×10-6/°C(40-800°C)

7.8

8.0

8.0

11.0

Thermo conductivity

W/m·K( 20°C)

22

28

31

2.6

Thermal Resistance

 °C

 200

 200

 230

 300

Dielectric strength

 V/m

 15×106

 15×106

 15×106

 11×106

Dielectric phase angle

 (1MHz)

 ×10-4

4

2

1

16 

SIC(1MHz)

9.2

9.8

9.9

33

Nitric Acid

 (60%)90°C

WT Loss mg/cm2/day≤

0.12

0.10

0.05

  ≠0

Sodium hudroxide

 (30%)80°C

WT Loss mg/cm2/day≤

0.53

0.26

0.04

0.08