Precision Custom Anti-corrode High Purity 99.7% Square Al2O3 / Alumina Ceramic Crucible

Item

Test?Condition

Unit?Symbol

95%Alumina?

ceramics

99%Alumina?

ceramics

99.7%Alumina?

ceramics

The?main?chemical?ingredient

Al2O3

Al2O3

Al2O3

Bulk?Density

g/cm3

3.6

3.89

3.96

Maximum?Use?Temperature

1450℃

1600℃

1650℃

Water?absorption

%

0

0

0

ROHS?Hardness

≥85

≥89

≥89

Flexural?strength

20°?C

MPa?(psi?x?103)

358?(52)

550

550

Compressive?Strength

20°?C

MPa?(psi?x?103)

2068?(300)

2600(377)

2600(377)

Fracture?Toughness

K(I?c)

Mpa?m1/2

4-5

5.6

6

Coefficient?of?

thermal?expansion

25-1000°?C

1X?10-6/°C

7.6

7.9

8.2

Coefficient?of?

thermal?conductivity

20°?C

W/m?°K

16

30.0

30.4

Thermal?Shock?Resistance

Tc

°C

250

200

200

Dielectricity?constant

1MHz.25℃

9

9.7

9.7

Dielectric?strength

ac-kV/mm?(ac?V/mil)

8.3?(210)

8.7?(220)

8.7?(220)