Meterial

Al2O3

Zro2

Tio2

Codierite

Si3N4

Sic

Color

Pink

Russet

Dark Brown

White

Ivory

Yellow

White

Ivory

White

ocher

White

Black

Gray

Black

Bulk Density

g/cm²

3.6 ~ 3.95

5.6

6.05

4.1

2.6 ~ 2.7

3.2 ~ 3.3

3.16 ~ 3.2

Water Absorption

%

0 ~ 0.6

0

0

0

0

0

0

Vickers hardness

Load 500g

Gpa

9 ~ 18

10.7

13.2

8.5

7.2 ~ 7.7

13.9 ~ 14.0

22.0 ~ 23.0

Flexural Strength

(3)-point Bending) R.T

Mpa

120 ~ 400

750

1000

320

150 ~ 170

610 ~ 1020

450 ~ 540

Compressive

Strength R.T

Mpa

2000 ~ 2500

-

5690

-

-

3820

-

Fracture

Toughness (K1C)

Mpa/m

3 ~ 5

7 ~ 8

4 ~ 6

-

-

5 ~ 7

2 ~ 5

Young’s

Modulus R.T

Gpa

160 ~ 380

200

200

260

140

290 ~ 300

430 ~ 440

Poisson’s Ratio R.T

0.17 ~ 0.23

0.31

0.31

-

0.31

0.28

0.16 ~ 0.17

Coefficient

of Linear

Thermal

Expansion

40 ~400°C

X106/°C

6.8 ~ 7.2

10

10.5

11.5

<|0.1|

(22~23°C)

2.6 ~ 2.8

3.7

40 ~800°C

7.8 ~ 8.2

10.5

11.0

12.5

3.2 ~ 3.3

4.4

Thermal Conductivity

R.T

W/m∙k

8 ~ 34

3

3

3

4

20 ~ 27

60 ~ 200

Specific Heat R.T

J/kg∙k

0.75~0.79x103

0.46x103

0.46x103

0.71x103

0.73x103

0.65x103

0.67x103

Heat Shock

Resistance △T

°C

200 ~ 320

450

300

-

-

550 > 800

400

Volume

Resistivity R.T

Ω∙cm

>10¹⁴

>10¹⁴

10¹³

10¹²

10¹⁴

10¹⁴

105~ 108

Nitric Acid(60%) 90°C

Wt. Loss

mg/cm2

/day

0.03 ~ 0.32

-

≒0.00

-

-

1 ~ 1.11

≒0.00 ~ 0.04

Sulphuric Acid(95%) 95°C

0.19 ~ 0.65

-

0.04

-

-

0 ~ 0.4

≒0.00 ~ 0.01

Caustic Sode(30%) 80°C

0.03 ~ 0.95

-

0.08

-

-

0.2 ~ 0.36

≒0.00