MATERIAL

ALUMINA(Al₂O₃)

ZIRCONIA(ZrO₂)

99.5%

99.9%

Y Type

Mg Type

Color

White

Ivory

Ivory

Yellow

Density

3.8

3.9

6.0

5.7

Vickers Hardness Load(500g)

Kgf/mm²

1700

1750

1250

1100

GPa

16.7

17.2

12.3

10.8

Flexural Strength

Kgf/mm²

33

50

100

70

Gpa

323

490

980

686

Compressive Strength

Kgf/mm²

240

-

580

-

Mpa

2353

-

5686

-

Young's Modulus of Elasticity

X10⁶Kgf/Cm²

3.7

3.9

2.1

2.1

GPa

362

382

206

206

Coefficient of Linear Thermal Expansion (x10^-6/¡É)

40 ~ 400¡É

7.1

7.2

10.5

9.9

40 ~ 800¡É

7.9

8.0

11.0

10.3

Thermal Conductivity(20¡É)
(cal*cm/cm²*sec*¡É)

0.06

0.08

0.009

0.008

Fracture Toughness (MN/m^3/2)

3.4

3.4

6.0

11.5

Max. Use Temperature (¡É)

1600

1750

200

800

Thermal Shock Resistance

¡É

250

250

300

450

¢µ

482

482

572

842